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r/restic: Enhance restic-backup security sandbox 

Since `restic` needs to run as root in order to back up files regardless
of their permissions, we need to restrict it to doing only that.  Using
systemd sandbox features, especially the capability bounding set, we can
remove all of _root_'s powers except the ability to read all files.
frigate-exporter
Dustin 2024-09-04 17:43:24 -05:00
parent c2c283c431
commit 7d93ba836e
1 changed files with 19 additions and 0 deletions
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19
roles/restic/files/restic-backup.service
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@ -10,3 +10,22 @@ Environment=RESTIC_PASSWORD_FILE=%d/restic.password
Environment=XDG_CACHE_HOME=%C
EnvironmentFile=-%E/restic/environment
ExecStart=/usr/bin/restic backup --files-from %E/restic/include --exclude-file %E/restic/exclude --exclude-if-present .nobackup
CacheDirectory=restic
CapabilityBoundingSet=CAP_DAC_READ_SEARCH
MemoryDenyWriteExecute=yes
PrivateDevices=yes
PrivateTmp=yes
ProtectClock=yes
ProtectControlGroups=yes
ProtectHome=read-only
ProtectKernelLogs=yes
ProtectKernelModules=yes
ProtectKernelTunables=yes
ProtectProc=invisible
ProtectSystem=strict
ReadWritePaths=%t
ReadWritePaths=%T
ReadWritePaths=%V
RestrictRealtime=yes
RestrictSUIDSGID=yes
UMask=0077