Closes zhoreeq#21 `systemd-analyze security meshnamed` returns: ``` NAME DESCRIPTION EXPOSURE ✓ SystemCallFilter=~@swap System call deny list defined for service, and @swap is included ✗ SystemCallFilter=~@resources System call deny list defined for service, and @resources is not included (e.g. ioprio_set is allowed) 0.2 ✓ SystemCallFilter=~@reboot System call deny list defined for service, and @reboot is included ✓ SystemCallFilter=~@raw-io System call deny list defined for service, and @raw-io is included ✓ SystemCallFilter=~@PRIVILEGED System call deny list defined for service, and @PRIVILEGED is included ✓ SystemCallFilter=~@obsolete System call deny list defined for service, and @obsolete is included ✓ SystemCallFilter=~@mount System call deny list defined for service, and @mount is included ✓ SystemCallFilter=~@module System call deny list defined for service, and @module is included ✓ SystemCallFilter=~@debug System call deny list defined for service, and @debug is included ✓ SystemCallFilter=~@cpu-emulation System call deny list defined for service, and @cpu-emulation is included ✓ SystemCallFilter=~@clock System call deny list defined for service, and @clock is included ✓ RemoveIPC= Service user cannot leave SysV IPC objects around ✗ RootDirectory=/RootImage= Service runs within the host's root directory 0.1 ✓ User=/DynamicUser= Service runs under a transient non-root user identity ✓ RestrictRealtime= Service realtime scheduling access is restricted ✓ CapabilityBoundingSet=~CAP_SYS_TIME Service processes cannot change the system clock ✓ NoNewPrivileges= Service processes cannot acquire new privileges ✓ AmbientCapabilities= Service process does not receive ambient capabilities ✓ CapabilityBoundingSet=~CAP_BPF Service may load BPF programs ✓ SystemCallArchitectures= Service may execute system calls only with native ABI ✗ RestrictAddressFamilies=~AF_(INET|INET6) Service may allocate Internet sockets 0.3 ✓ ProtectSystem= Service has strict read-only access to the OS file hierarchy ✓ ProtectProc= Service has restricted access to process tree (/proc hidepid=) ✓ SupplementaryGroups= Service has no supplementary groups ✓ CapabilityBoundingSet=~CAP_SYS_RAWIO Service has no raw I/O access ✓ CapabilityBoundingSet=~CAP_SYS_PTRACE Service has no ptrace() debugging abilities ✓ CapabilityBoundingSet=~CAP_SYS_(NICE|RESOURCE) Service has no privileges to change resource use parameters ✓ CapabilityBoundingSet=~CAP_NET_ADMIN Service has no network configuration privileges ✓ CapabilityBoundingSet=~CAP_NET_(BIND_SERVICE|BROADCAST|RAW) Service has no elevated networking privileges ✓ CapabilityBoundingSet=~CAP_AUDIT_* Service has no audit subsystem access ✓ CapabilityBoundingSet=~CAP_SYS_ADMIN Service has no administrator privileges ✓ PrivateTmp= Service has no access to other software's temporary files ✓ ProcSubset= Service has no access to non-process /proc files (/proc subset=) ✓ CapabilityBoundingSet=~CAP_SYSLOG Service has no access to kernel logging ✓ ProtectHome= Service has no access to home directories ✓ PrivateDevices= Service has no access to hardware devices ✗ PrivateNetwork= Service has access to the host's network 0.5 ✗ DeviceAllow= Service has a device ACL with some special devices: char-rtc:r 0.1 ✓ KeyringMode= Service doesn't share key material with other services ✓ Delegate= Service does not maintain its own delegated control group subtree ✓ PrivateUsers= Service does not have access to other users ✗ IPAddressDeny= Service does not define an IP address allow list 0.2 ✓ NotifyAccess= Service child processes cannot alter service state ✓ ProtectClock= Service cannot write to the hardware clock or system clock ✓ CapabilityBoundingSet=~CAP_SYS_PACCT Service cannot use acct() ✓ CapabilityBoundingSet=~CAP_KILL Service cannot send UNIX signals to arbitrary processes ✓ ProtectKernelLogs= Service cannot read from or write to the kernel log ring buffer ✓ CapabilityBoundingSet=~CAP_WAKE_ALARM Service cannot program timers that wake up the system ✓ CapabilityBoundingSet=~CAP_(DAC_*|FOWNER|IPC_OWNER) Service cannot override UNIX file/IPC permission checks ✓ ProtectControlGroups= Service cannot modify the control group file system ✓ CapabilityBoundingSet=~CAP_LINUX_IMMUTABLE Service cannot mark files immutable ✓ CapabilityBoundingSet=~CAP_IPC_LOCK Service cannot lock memory into RAM ✓ ProtectKernelModules= Service cannot load or read kernel modules ✓ CapabilityBoundingSet=~CAP_SYS_MODULE Service cannot load kernel modules ✓ CapabilityBoundingSet=~CAP_SYS_TTY_CONFIG Service cannot issue vhangup() ✓ CapabilityBoundingSet=~CAP_SYS_BOOT Service cannot issue reboot() ✓ CapabilityBoundingSet=~CAP_SYS_CHROOT Service cannot issue chroot() ✓ PrivateMounts= Service cannot install system mounts ✓ CapabilityBoundingSet=~CAP_BLOCK_SUSPEND Service cannot establish wake locks ✓ MemoryDenyWriteExecute= Service cannot create writable executable memory mappings ✓ RestrictNamespaces=~user Service cannot create user namespaces ✓ RestrictNamespaces=~pid Service cannot create process namespaces ✓ RestrictNamespaces=~net Service cannot create network namespaces ✓ RestrictNamespaces=~uts Service cannot create hostname namespaces ✓ RestrictNamespaces=~mnt Service cannot create file system namespaces ✓ CapabilityBoundingSet=~CAP_LEASE Service cannot create file leases ✓ CapabilityBoundingSet=~CAP_MKNOD Service cannot create device nodes ✓ RestrictNamespaces=~cgroup Service cannot create cgroup namespaces ✓ RestrictNamespaces=~ipc Service cannot create IPC namespaces ✓ ProtectHostname= Service cannot change system host/domainname ✓ CapabilityBoundingSet=~CAP_(CHOWN|FSETID|SETFCAP) Service cannot change file ownership/access mode/capabilities ✓ CapabilityBoundingSet=~CAP_SET(UID|GID|PCAP) Service cannot change UID/GID identities/capabilities ✓ LockPersonality= Service cannot change ABI personality ✓ ProtectKernelTunables= Service cannot alter kernel tunables (/proc/sys, …) ✓ RestrictAddressFamilies=~AF_PACKET Service cannot allocate packet sockets ✓ RestrictAddressFamilies=~AF_NETLINK Service cannot allocate netlink sockets ✓ RestrictAddressFamilies=~AF_UNIX Service cannot allocate local sockets ✓ RestrictAddressFamilies=~… Service cannot allocate exotic sockets ✓ CapabilityBoundingSet=~CAP_MAC_* Service cannot adjust SMACK MAC ✓ RestrictSUIDSGID= SUID/SGID file creation by service is restricted ✗ UMask= Files created by service are world-readable by default 0.1 → Overall exposure level for meshnamed.service: 1.2 OK 🙂 ``` Signed-off-by: Marek Küthe <m.k@mk16.de>

Commits

Commits on Feb 25, 2024

Hardening the systemd service