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41 lines
1.8 KiB
41 lines
1.8 KiB
# Subgraph Firewall
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A desktop application firewall for Subgraph OS.
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**Subgraph Firewall** is an application firewall that is included in Subgraph OS.
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While most firewalls are designed to handle incoming network communications, an
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application firewall can handle outgoing network communications. **Subgraph Firewall**
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can apply policies to outgoing connections on a per-application basis.
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_Application firewalls_ are useful for monitoring unexpected connections from applications.
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For example, some applications may _phone home_ to the vendor's website.
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Often this activity is legitimate (non-malicious) but it still may violate the user's
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privacy or expectations of how the software operates.
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**Subgraph Firewall** gives users the choice to allow or deny these connections.
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Malicious code may also _phone home_ to a website or server that is operated by the
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hacker or malicious code author. Subgraph Firewall can also alert the user of these connections so that they can be denied.
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_Application firewalls_ cannot prevent all malicious code from connecting to the Internet.
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Sophisticated malicious code can subvert the _allowed_ connections to bypass the firewall.
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However, the firewall may alert the user of connection attempts by less sophisticated malicious code.
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Read more in the [Subgraph OS Handbook](https://subgraph.com/sgos-handbook/sgos_handbook.shtml#monitoring-outgoing-connections-with-subgraph-firewall).
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## Building
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```
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# To build the Debian package:
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git clone -b debian https://github.com/subgraph/fw-daemon.git
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cd fw-daemon
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## To build from stable
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gbp buildpackage -us -uc
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## To build from head
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gbp buildpackage -us -uc --git-upstream-tree=master
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## Install the package
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dpkg -i /tmp/build-area/fw-daemon{,-gnome}-*.deb
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## Refresh your gnome-shell session 'alt-r' type 'r' hit enter.
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```
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