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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Other uses of policy enhancements
Throughout the book, we've covered quite a few technological features of SELinux. By creating our own SELinux policies, we can augment this further.
Creating customized SECMARK types
A use case for building our own policy is to create a custom SECMARK type and make sure that a particular domain is the only domain that is allowed to handle this communication.
The following SELinux rules create an invalid_packet_t type (to match packets that should not be sent out: for example, the PostgreSQL communication that is directed to the Internet rather than the internal network) and an intranet_packet_t type (to match packets being sent to an intranet server):
# cat custom_packets.te policy_module(custom_packets, 1.0) type ...Become 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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