December 2016
Intermediate to advanced
300 pages
6h 36m
English
Content preview from SELinux System Administration - Second EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Linux netfilter and SECMARK support
The approach with TCP and UDP ports has a few downsides. One of them is that there is no knowledge of the target host, so you cannot govern where an application can connect to. There is also no way of limiting daemons from binding on any interface: in a multi-homed situation, we might want to make sure that a daemon only binds on the interface facing the internal network and not the Internet-facing one, or vice versa.
In the past, SELinux allowed support for this binding issue through the interface and node labels: a domain could only be allowed to bind to one interface and not on any other, or even on a particular address (referred to as the node). This support had its flaws though, and has been largely deprecated ...
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