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SE Linux in Debian/Stretch

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[系统(linux) 所属分类 系统(linux) | 发布者 店小二04 | 时间 2017 | 作者 红领巾 ] 0人收藏点击收藏

Debian/Stretch has been frozen. Before the freeze I got almost all the bugs in policy fixed, both bugs reported in the Debian BTS and bugs that I know about. This is going to be one of the best Debian releases for SE linux ever.

Systemd with SE Linux is working nicely. The support isn’t as good as I would like, there is still work to be done for systemd-nspawn. But it’s close enough that anyone who needs to use it can use audit2allow to generate the extra rules needed. Systemd-nspawn is not used by default and it’s not something that a new Linux user is going to use, I think that expert users who are capable of using such features are capable of doing the extra work to get them going.

In terms of systemd-nspawn and some other rough edges, the issue is the difference between writing policy for a single system vs writing policy that works for everyone. If you write policy for your own system you can allow access for a corner case without a lot of effort. But if I wrote policy to allow access for every corner case then they might add up to a combination that can be exploited. I don’t recommend blindly adding the output of audit2allow to your local policy (be particularly wary of access to shadow_t and write access to etc_t, lib_t, etc). But OTOH if you have a system that’s running in enforcing mode that happens to have one daemon with more access than is ideal then all the other daemons will still be restricted.

As for previous releases I plan to keep releasing updates to policy packages in my own apt repository. I’m also considering releasing policy source to updates that can be applied on existing Stretch systems. So if you want to run the official Debian packages but need updates that came after Stretch then you can get them. Suggestions on how to distribute such policy source are welcome.

Please enjoy SE Linux on Stretch. It’s too late for most bug reports regarding Stretch as most of them won’t be sufficiently important to justify a Stretch update. The vast majority of SE Linux policy bugs are issues of denying wanted access not permitting unwanted access (so not a security issue) and can be easily fixed by local configuration, so it’s really difficult to make a case for an update to Stable. But feel free to send bug reports for Buster (Stretch+1).

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