feat: implement initial borgmatic Prometheus exporterv1.0.0

3 files changed, 73 insertions, 0 deletions

diff --git a/contrib/prometheus-borgmatic-exporter.confd b/contrib/prometheus-borgmatic-exporter.confd
new file mode 100644
index 0000000..cf82ace
--- /dev/null
+++ b/contrib/prometheus-borgmatic-exporter.confd
@@ -0,0 +1 @@
+PROMETHEUS_BORGMATIC_EXPORTER_ARGS=""
diff --git a/contrib/prometheus-borgmatic-exporter.service b/contrib/prometheus-borgmatic-exporter.service
new file mode 100644
index 0000000..56c3d18
--- /dev/null
+++ b/contrib/prometheus-borgmatic-exporter.service
@@ -0,0 +1,61 @@
+[Unit]
+Description=Borgmatic Prometheus metrics exporter
+After=network.target
+
+[Service]
+Type=oneshot
+EnvironmentFile=/etc/conf.d/prometheus-borgmatic-exporter
+ExecStart=/usr/bin/prometheus-borgmatic-exporter $PROMETHEUS_BORGMATIC_EXPORTER_ARGS
+
+User=root
+Group=root
+
+# Needs write access to emit the .prom file and read/write the borg cache.
+# All other paths read-only by default
+ReadWritePaths=/var/lib/prometheus/node-exporter
+ReadWritePaths=/root/.cache/borg
+# Mount a private /tmp not shared with the rest of the system
+PrivateTmp=true
+# Mount a minimal /dev without the access to raw block or character devices
+PrivateDevices=true
+# ProtectSystem and ProtectHome are ineffective for root and intentionally omitted
+
+# Hide other processes in /proc
+ProtectProc=invisible
+# Limit /proc to PID-related files only
+ProcSubset=pid
+# Set predictable permissions for the written .prom file
+UMask=0022
+
+# Restrict to the address families needed for SSH and local communication
+RestrictAddressFamilies=AF_INET AF_INET6 AF_UNIX
+
+# Kernel and system hardening
+ProtectKernelTunables=true
+ProtectKernelModules=true
+ProtectKernelLogs=true
+ProtectControlGroups=true
+ProtectHostname=true
+ProtectClock=true
+RestrictNamespaces=true
+RestrictRealtime=true
+RestrictSUIDSGID=true
+LockPersonality=true
+MemoryDenyWriteExecute=true
+RemoveIPC=true
+
+# Capabilites
+# Root always holds capabilites, but we restrict what child processes can inherit
+# CAP_DAC_OVERRIDE: needed by borg for file acess
+# CAP_NET_RAW: needed for SSH connections
+CapabilityBoundingSet=CAP_DAC_OVERRIDE CAP_NET_RAW
+AmbientCapabilities=
+# NoNewPrivileges is intentionally omitted as borg needs to exec SSH
+
+# Syscall filtering
+SystemCallArchitectures=native
+SystemCallFilter=@system-service
+SystemCallFilter=~@privileged @resources @mount @swap @reboot
+
+[Install]
+WantedBy=multi-user.target
diff --git a/contrib/prometheus-borgmatic-exporter.timer b/contrib/prometheus-borgmatic-exporter.timer
new file mode 100644
index 0000000..61fa6a8
--- /dev/null
+++ b/contrib/prometheus-borgmatic-exporter.timer
@@ -0,0 +1,11 @@
+[Unit]
+Description=Run Borgmatic Prometheus metrics exporter daily
+After=network.target
+
+[Timer]
+OnCalendar=daily
+AccuracySec=1h
+Persistent=true
+
+[Install]
+WantedBy=timers.target