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=============
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Caching Proxy
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=============
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.. image:: images/forward_proxy.png
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OPNsense is equipped with a fully featured forward caching (transparent) proxy.
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A caching proxy reduces bandwidth and improves response times by caching and
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reusing frequently-requested web pages. The Access Control Lists can be utilized
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for user authentication and or as (category based) web filter.
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Features include:
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* Multi Interface Support
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* Transparent Mode (including SSL/HTTPS)
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* ICAP Support for Anti Virus/Malware Engine
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* HTTP Proxy
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* FTP Proxy
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* User Authentication
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* Access Control Lists (valid for both http(s) and ftp)
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* (Compressed) Blacklist
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* Category Based Web Filtering
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* Can be combined with traffic shaper
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--------------
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Authenticators
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--------------
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User authentication can be done using OPNsense standard and built-in authenticators.
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Currently these include:
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* LDAP (incl. Microsoft Active Directory)
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* Radius
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* Local user manager
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* No authentication
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--------------
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Access Control
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--------------
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OPNsense supports fine grained access control, base upon:
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* Subnets
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* Ports
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* MIME types
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* Banned IP’s
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* Whitelists
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* Blacklists
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* Browser/User Agents
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------------------
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Traffic Management
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------------------
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The proxy can be combined with the traffic shaper and take full advantage of its
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shaping features.Additionally it includes its own options:
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* Maximum download size
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* Maximum upload size
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* Overall bandwidth throttling
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* Per host bandwidth throttling
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-------------------------
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Category Based Web Filter
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-------------------------
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No need for additional plugins, such as squidGuard - as OPNsense has built-in
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category based web filter support. Main features include:
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* Fetch from a remote URL
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* Supports flat file list and category based compressed lists
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* Automatically convert category based blacklists to squid ACLs
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* Keep up to date with the built-in scheduler
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* Compatible with most popular blacklist
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----------------
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Transparent Mode
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----------------
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The transparent mode means all request will be diverted to the proxy without any
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configuration on your client. Transparent mode works very well with unsecured http
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requests, however with secured (SSL) HTTPS connection the proxy will become a
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man-in-the-middle as the client will "talk" to the proxy and the proxy will encrypt
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the traffic with its master key that the client is required to trust.
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.. Warning::
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Using a transparent HTTPS proxy can be a dangerous practice and may not be
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allowed by the services you use, for instance e-banking.
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------------
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WPAD And PAC
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------------
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If a transparent proxy cannot be used, OPNsense still supports automatic proxy
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configuration via WPAD / PAC.
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.. Warning::
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WPAD via DNS requires the web interface to run on the default HTTP port
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(TCP/80) which is also a security risk (MITM attacks). In such cases you
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should proxy the connection or avoid configuring the applicance from an
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untrusted network.
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------------------------
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Configuration / HOW-TO's
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------------------------
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More information on how to utilize OPNsense's proxy service can be found in:
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Proxy Basic Setup
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-----------------
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:doc:`how-tos/cachingproxy`
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Setup Web Filtering
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-------------------
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:doc:`how-tos/proxywebfilter`
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Setup Transparent Mode (including SSL)
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--------------------------------------
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:doc:`how-tos/proxytransparent`
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Setup WPAD/PAC
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--------------
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:doc:`how-tos/pac`
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Setup ICAP Anti Virus/Malware Engine
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------------------------------------
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:doc:`how-tos/proxyicapantivirus`
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