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Sebastian Wick
05d309f852
Add systemd-varlink-monitord, a daemon that uses BPF LSM and fentry hooks to capture varlink protocol traffic on AF_UNIX sockets. Sockets are classified as varlink by reading the user.varlink xattr. The daemon exposes a varlink API with Setup/Start/Stop methods and passes a ring buffer fd to the client for zero-copy packet delivery. Unprivileged callers can only see their own traffic; polkit authorization grants full access.
39 lines
1.0 KiB
Plaintext
39 lines
1.0 KiB
Plaintext
# SPDX-License-Identifier: LGPL-2.1-or-later
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#
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# This file is part of systemd.
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#
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# systemd is free software; you can redistribute it and/or modify it
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# under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation; either version 2.1 of the License, or
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# (at your option) any later version.
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[Unit]
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Description=Varlink Monitor
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Documentation=man:systemd-varlink-monitord.service(8)
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[Service]
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DynamicUser=yes
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AmbientCapabilities=CAP_BPF CAP_PERFMON
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CapabilityBoundingSet=CAP_BPF CAP_PERFMON
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ExecStart={{LIBEXECDIR}}/systemd-varlink-monitord
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IPAddressDeny=any
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LockPersonality=yes
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MemoryDenyWriteExecute=yes
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NoNewPrivileges=yes
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PrivateDevices=yes
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PrivateTmp=disconnected
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ProtectClock=yes
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ProtectHome=yes
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ProtectHostname=yes
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ProtectKernelLogs=yes
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ProtectKernelModules=yes
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ProtectKernelTunables=yes
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ProtectSystem=strict
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RestrictAddressFamilies=AF_UNIX
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RestrictNamespaces=yes
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RestrictRealtime=yes
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RestrictSUIDSGID=yes
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SystemCallArchitectures=native
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SystemCallErrorNumber=EPERM
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SystemCallFilter=@system-service bpf perf_event_open
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