Reduce privileges in systemd.service#119
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alexvojproc wants to merge 1 commit intoInfrastructureServices:mainfrom
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Reduce privileges in systemd.service#119alexvojproc wants to merge 1 commit intoInfrastructureServices:mainfrom
alexvojproc wants to merge 1 commit intoInfrastructureServices:mainfrom
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This commit hardens the dnsconfd systemd service. dnsconfd and its Unbound backend are often used in security-conscious environments, such as for stable DNS over TLS and local DNSSEC validation. For example, the secureblue project, a derivative of Fedora Atomic, recently switched its users to dnsconfd by default. This is useful if the daemon is compromised somehow, but mostly improves auditabity. Rather than checking the SELinux policy, this gives the sysadmin a quick overview of the daemon's privileges (and for tools like `systemd-analyze security`). - Explicitly cap with no capabilities (already runs as `dnsconfd:dnsconfd` anyway) - Read-only filesystem except for `resolv.conf` and `/run/dnsconfd` - Removes legacy syscalls and IPC types - Reduces unnecessary kernel attack surface - Exploit mitigation (W^X, DoS, persistent privilege escalation)
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This commit hardens the dnsconfd systemd service. dnsconfd and its Unbound backend are often used in security-conscious environments, such as for stable DNS over TLS and local DNSSEC validation. For example, the secureblue project, a derivative of Fedora Atomic, recently switched its users to dnsconfd by default, where we use this hardening as an override.
This is useful if the daemon is compromised somehow, but mostly improves auditabity. Rather than checking the SELinux policy, this gives the sysadmin a quick overview of the daemon's privileges (and for tools like
systemd-analyze security).dnsconfd:dnsconfdanyway)resolv.confand/run/dnsconfd