| Headlines |
| 2024-02-27 |
Key OpenBSD features which do not get much attention |
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The OpenBSD operating system is well known for its impressive security record and dedication to accurate documentation. While OpenBSD is regarded as a secure platform, the specific, proactive security features included in the operating system are sometimes overlooked. Solène Rapenne has posted a blog which outlines some of OpenBSD's less talked about features: "The secure level is a sysctl named kern.securelevel, it has 4 different values from level -1 to level 2, and it's only possible to increase the level. By default, the system enters the secure level 1 when in multi-user (the default when booting a regular installation). It's then possible to escalate to the last secure level (2), which will enable the following extra security: all raw disks are read-only, so it's not possible to try to make a change to the storage devices; the time is almost lock, it's only possible to modify the clock slowly by small steps (maybe 1 second max every so often); the PF firewall rules can't be modified, flushed or altered...." |
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