October 2004
Intermediate to advanced
256 pages
8h 16m
English
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Examining a Sample Policy
Seeing the
syntax of individual policy
declarations is not the same as seeing how they work together to
establish a useful policy. In this section, we’ll
look at the policy that governs the ping_t domain,
and the related domain ping_exec_t, as implemented
in Fedora Core 2. Like most policies, this policy resides in two
files:
- file_contexts/program/ping.fc
Specifies security contexts for files related to the domains.
- domains/program/ping.te
Specifies the RBAC declarations related to the domains.
The ping.fc file has these contents:
# ping /bin/ping.* -- system_u:object_r:ping_exec_t /usr/sbin/hping2 -- system_u:object_r:ping_exec_t
When the filesystems are labeled, these specifications cause ordinary
files matching the first regular expression
/bin/ping.* to be labeled with the security
context system_u:object_r:ping_exec_t. Ordinary
files matching the second regular expression
/usr/sbin/hping2 are also labeled with that
security context. The ping.te file is
considerably longer than the ping.fc file, so
we’ll analyze it a few lines at a time. The first
several lines are merely comments:
#DESC Ping - Send ICMP messages to network hosts # # Author: David A. Wheeler <dwheeler@ida.org> # X-Debian-Packages: iputils-ping netkit-ping iputils-arping arping hping2 # ################################# # # Rules for the ping_t domain. # # ping_t is the domain for the ping program. # ping_exec_t is the type of the corresponding program. #
The comments point out that the domain ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.