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bdf836911e
This small edit clarifies that a Tor exit node is a certain kind of relay. The implication in the current documentation is that all relays are exit nodes. (See: https://www.grammarly.com/blog/which-vs-that/.)
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=================
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Tor Configuration
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=================
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.. Note::
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Saving changes in modal dialogs does not apply the settings.
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To apply them, you have to click the "Reload Service" button.
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------------
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Installation
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------------
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First of all, install the tor plugin (os-tor) from the plugins view.
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.. image:: ../images/menu_plugins.png
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After a page reload you will get a new menu entry under services for Tor.
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Open the menu and choose "Configuration" to configure the plugin.
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----------------
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General Settings
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----------------
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This section controls how Tor behaves in general as well as forward proxying.
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Global Settings
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===============
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.. image:: images/tor_general.png
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Tor Service Settings
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--------------------
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:Enable:
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Controls if the service should be running. If it is enabled,
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it will also be enabled at boot time.
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:Control Port:
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The control port is used for control communication with the Tor daemon.
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This Port requires a password, which will not be disclosed to the GUI but
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can be queried via the API. This setting is available for you to handle
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Port conflicts, so you can change this port.
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:Create a logfile, Send log messges to syslog:
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Enable this checkbox if you want some logging. Please note that a detailed
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log may lead to privacy issues.
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:Logfile, Syslog level:
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If the corresponding checkbox is enabled, this will be the minimum severity
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for sending or writing log messges.
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:Fascist Mode:
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If internet access is filtered, you can try this option.
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Please note that this is not compatible with other features like "Hidden Services".
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:Fascist Firewall Ports:
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These are the unfiltered ports of the firewall. The defaults of 80 and 443 are
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choosen, because they are commonly open.
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Forward Proxy
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-------------
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.. Note::
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The SOCKS proxy is only useable from localhost (127.0.0.1 and ::1)
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unless an ACL is added in the "SOCKS Proxy ACL" section.
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:Listen Interfaces:
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Add one or multiple interfaces, on which Tor should listen additionally
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to the loopback interface. This is required if you want to use Tor from
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other computers than the appliance itself. Tor will bind on the
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statically configured IP address from your interface configuration.
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If the interface has no static IP configured, it will be ignored.
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:SOCKS Port Number:
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The port which should be used for the SOCKS server.
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Transparent Forward Proxy
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-------------------------
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:Transparent Port:
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This port is the target for your NAT rule.
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Please create a rule for this port in the "Port Forward" section of the firewall.
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:Transparent DNS Port:
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If you are using Tor transparently, you can resolve .onion addresses
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to IPs of the given pool for example. This also allows to keep DNS secret.
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:Transparent IP Pool:
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This is used to provide an IP pool to Tor, which can be used for host mapping.
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This needs to be a /16 network at minimum.
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:Map Host To IP Pool:
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This option will assign IP addresses to resolved .onion domains by the
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Tor DNS service. Checking this box is recommend but a transparent IP
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pool is required
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SOCKS ACL
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=========
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.. WARNING::
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If untrusted devices have access to the SOCKS proxy,
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private information may be leaked.
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Please be careful with the networks you allow here.
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.. image:: images/tor_socks_acl.png
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In this example, you can see that all Hosts of the
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192.168.0.0/16 network have access to the Tor Proxy.
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By default, connections are forbidden.
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Creating a new entry is quite easy. Just click the `+` and
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fill out the form:
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.. image:: images/tor_socks_acl_edit.png
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:Enable:
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The entry will be added to the configuration file.
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If this checkbox is unckecked, the entry is ignored.
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:Protocol:
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Select the protocol in use for this ACL.
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You can choose between IPv4 and IPv6.
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By default, IPv6 is selected.
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:Network:
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In this field, you have to add the network,
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on which this ACL should be applied in CIDR notation.
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:Action:
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Select if the traffic should be accepted or rejected.
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----------------
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Hidden Services
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----------------
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A hidden service is an open TCP port, which is hosted in the Tor network
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and therefore the origin of the service is hard to trace.
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For example, you can host a website in Tor by running a webserver in your
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network and forwarding a hidden service port to this webserver.
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.. WARNING::
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This does not work with every protocol as there are protocols
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which open arbitrary ports. An example for that is FTP.
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You may work around this issue by limiting the usable ports
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of such services (for example 10 ports) and forward those to the server.
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If you want to host a hidden service,
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you need to open the hidden service tab and click the `+` button.
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.. image:: images/tor_hidden_services.png
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The following dialog will open and you can enter a name.
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.. image:: images/tor_hidden_services_edit.png
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You are allowed to add any alphanumeric name here.
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For example, you can call your service sampleservice.
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Click "Save changes" and your service is saved to the
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configuration file but not saved to the Tor configuration file.
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Switch to the "Hidden Service Routing" tab:
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.. image:: images/tor_hidden_services_routing.png
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For any port you want to forward, you have to click `+` and fill out the form:
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.. image:: images/tor_hidden_services_route_edit.png
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:Hidden Service:
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The service on which the port forward applies.
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The entries in this list are the services created in the previous step.
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:Port:
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The virtual Port in the Tor network.
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:Target Host:
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The host, on which the real service is running.
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:Target Port:
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The real port of the service. Please note that
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this does not need to match the `Port` field but some
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services may act strange on mismatch.
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The sample in the screenshot would forward traffic from the virtual host
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in the Tor network it gets on port 80 to 127.0.0.1:8080
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.. Warning::
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When using local connections like `127.0.0.1` or `::1`, your application
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may think this connection is trusted (localhost is not from the internet).
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Be careful when forwarding traffic to localhost.
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In addition to regular onion services, the services can be protected even more
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by requireing the client to know a secret cookie.
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This setting needs to be configured on both ends. On the server hosting the
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onion service, you need to configure it on the configuration tab for the onion
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service.
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For example, if you want to have a stealth service (undetectable without knowing
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the key), you can configure it like the following:
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.. image:: images/tor_hidden_services_edit_very_hidden.png
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:Authorization Type:
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Can be `Stealth` or `Basic`. Basic means that multiple clients can use the
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entry point and it is still visible but unauthorized hosts can not connect.
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:Authorized Clients:
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You can choose some names for your clients. Each client gets a authorization
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cookie assigned so they can connect to it. If you set this value, this onion
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service will not be available to the public anymore.
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Now as this service will need to be configured to the client side as well,
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you will need to add the secret to the configuration page. To configure a
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authorization cookie for a service, you can open the
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`Onion Service Authentication` tab and fill out the form like on the screenshot:
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.. image:: images/tor_hidden_servicesvery_hidden_credentials.png
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You need to configure the hostname and the authorization cookie you will get.
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:Host Name:
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Enter the .onion address of the onion service.
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:Authentication Cookie:
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This is the authentication code you will get from the maintainer of the
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onion service. Enter it into this field.
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When you are done, save the settings and reload the service. After that, you should
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be able to reach the service.
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------
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Relays
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------
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A Tor relay is a host which forwards traffic for other Tor nodes.
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A relay that allows traffic to pass outside of the Tor network
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is called an "Exit Node". If the relay is configured only for you
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(not for public access), it is called a bridge.
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Bridges are used to circumvent filtering of public entry nodes based
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on IP/Port basis as the existence of bridges is usually unknown.
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Relays And Bridges
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==================
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.. image:: images/tor_relay.png
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.. Note::
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To be a relay, your host must have a public
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available port. With relaying, you will increase the anonymity
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of Tor and it is less risky than an exit node.
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:Enable:
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Enable this checkbox if you want to relay traffic (forward
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foreign traffic).
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:Host:
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This is the host to bind the relay port to. This can be the public IP
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address. This setting is optional and may be omitted.
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:Port:
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This is the public port used. Do not forget to add a firewall rule
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to pass traffic to this port. Otherwise it will not work.
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:Address:
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You can enter the FQDN or the WAN IP of this Firewall.
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:Nickname:
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A nickname can be used to identify your network but it must only
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consist of alphanumeric characters.
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:Bandwith Rate:
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You can limit the bandwith Tor will use. By default, Tor will use the
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maximum amount of bandwith available.
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The value must be at least 72 kilobits per second.
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:Bandwith Burst:
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See Bandwith Rate.
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:Directory Port:
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If you have a lot of bandwith, you can also configure a directory port.
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You should not enable this port if your bandwith is small.
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:Reject Private IPs:
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**IMPORTANT** DO NOT DISABLE UNLESS YOU KNOW WHAT YOU ARE DOING.
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This option blocks access to RFC1918 addresses regardless of the
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configured policy. If you disable this option, somebody can invade
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your network.
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:Bridge:
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Enable this setting, if you want to be a bridge.
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:Publish Server Descriptor:
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If this is disabled, Tor will not publish descriptors. If you don't
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want to be in a directory (for example for testing reasons),
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uncheck this option.
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Exit Nodes
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==========
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.. Warning::
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Providing an exit node can lead to legal issues. It may be a good idea to
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consult a lawyer before setting up one as you might be made responsible for
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traffic, which originates from a malicious Tor user.
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If you have relaying enabled, you can also become an exit node.
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To allow outgoing connections, you have to open to the "Exit Node ACL" tab.
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.. image:: images/tor_exit.png
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Click on `+` to add a new ACL.
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.. image:: images/tor_exit_acl_entry.png
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:Enable:
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If it is checked, the ACL will be used by Tor,
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otherwise the line is ignored.
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:Protocol:
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Select the protocol, on which this ACL applies.
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You can select IPv4 and IPv6 here. IPv6 is the default.
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:Network:
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You can enter a target network in CIDR notation or an IP
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address here. If no IP is given, any IP will match.
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:Start Port, End Port:
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This match is the target port of a connection.
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You can provide only a start port if you want to match a single port.
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If you provide both, a port range will be used.
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:Action:
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If you select "Reject", no exit node traffic will be sent to this host
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and it will not be forwarded. If you choose "Accept", your host may
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be choosen as an exit node in a circuit.
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