Package: ircd-irc2 Version: 2.11.2p3~dfsg-5.1 Severity: wishlist Attached is my systemd hardening errata for ircd-irc2. It won't work for everyone, but at least SOME of it could be added to debian/ircd-irc2.service.
-- System Information: Debian Release: 11.5 APT prefers stable-updates APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'proposed-updates'), (500, 'stable') Architecture: amd64 (x86_64) Kernel: Linux 5.18.0-0.deb11.4-amd64 (SMP w/8 CPU threads; PREEMPT) Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_WARN, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8), LANGUAGE not set Shell: /bin/sh linked to /usr/bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled
# Security hardening. [Service] CapabilityBoundingSet= PrivateDevices=yes ProtectClock=yes NoNewPrivileges=yes ProtectKernelLogs=yes RemoveIPC=yes ProtectControlGroups=yes ProtectKernelModules=yes SystemCallArchitectures=native MemoryDenyWriteExecute=yes RestrictNamespaces=yes RestrictSUIDSGID=yes ProtectHostname=yes LockPersonality=yes ProtectKernelTunables=yes RestrictAddressFamilies=AF_UNIX AF_NETLINK AF_INET AF_INET6 RestrictRealtime=yes ProtectSystem=strict ProcSubset=pid ProtectHome=yes PrivateUsers=yes PrivateTmp=yes SystemCallFilter=@system-service SystemCallFilter=~@privileged SystemCallFilter=~@resources # These syscalls shouldn't actually be needed, but # whatever, I don't care. SystemCallFilter=@setuid IPAddressDeny=any IPAddressAllow=localhost IPAddressAllow=203.7.155.0/24 IPAddressAllow=10.194.71.0/24 UMask=0077
$ systemd-analyze security ircd-irc2.service NAME DESCRIPTION EXPOSURE ✗ PrivateNetwork= Service has access to the host's network 0.5 ✓ User=/DynamicUser= Service runs under a static non-root user identity ✓ CapabilityBoundingSet=~CAP_SET(UID|GID|PCAP) Service cannot change UID/GID identities/capabilities ✓ CapabilityBoundingSet=~CAP_SYS_ADMIN Service has no administrator privileges ✓ CapabilityBoundingSet=~CAP_SYS_PTRACE Service has no ptrace() debugging abilities ✗ RestrictAddressFamilies=~AF_(INET|INET6) Service may allocate Internet sockets 0.3 ✓ RestrictNamespaces=~CLONE_NEWUSER Service cannot create user namespaces ✓ RestrictAddressFamilies=~… Service cannot allocate exotic sockets ✓ CapabilityBoundingSet=~CAP_(CHOWN|FSETID|SETFCAP) Service cannot change file ownership/access mode/capabilities ✓ CapabilityBoundingSet=~CAP_(DAC_*|FOWNER|IPC_OWNER) Service cannot override UNIX file/IPC permission checks ✓ CapabilityBoundingSet=~CAP_NET_ADMIN Service has no network configuration privileges ✓ CapabilityBoundingSet=~CAP_SYS_MODULE Service cannot load kernel modules ✓ CapabilityBoundingSet=~CAP_SYS_RAWIO Service has no raw I/O access ✓ CapabilityBoundingSet=~CAP_SYS_TIME Service processes cannot change the system clock ✗ DeviceAllow= Service has a device ACL with some special devices 0.1 ✗ IPAddressDeny= Service defines IP address allow list with non-localhost entries 0.1 ✓ KeyringMode= Service doesn't share key material with other services ✓ NoNewPrivileges= Service processes cannot acquire new privileges ✓ NotifyAccess= Service child processes cannot alter service state ✓ PrivateDevices= Service has no access to hardware devices ✓ PrivateMounts= Service cannot install system mounts ✓ PrivateTmp= Service has no access to other software's temporary files ✓ PrivateUsers= Service does not have access to other users ✓ ProtectClock= Service cannot write to the hardware clock or system clock ✓ ProtectControlGroups= Service cannot modify the control group file system ✓ ProtectHome= Service has no access to home directories ✓ ProtectKernelLogs= Service cannot read from or write to the kernel log ring buffer ✓ ProtectKernelModules= Service cannot load or read kernel modules ✓ ProtectKernelTunables= Service cannot alter kernel tunables (/proc/sys, …) ✗ ProtectProc= Service has full access to process tree (/proc hidepid=) 0.2 ✓ ProtectSystem= Service has strict read-only access to the OS file hierarchy ✓ RestrictAddressFamilies=~AF_PACKET Service cannot allocate packet sockets ✓ RestrictSUIDSGID= SUID/SGID file creation by service is restricted ✓ SystemCallArchitectures= Service may execute system calls only with native ABI ✓ SystemCallFilter=~@clock System call allow list defined for service, and @clock is not included ✓ SystemCallFilter=~@debug System call allow list defined for service, and @debug is not included ✓ SystemCallFilter=~@module System call allow list defined for service, and @module is not included ✓ SystemCallFilter=~@mount System call allow list defined for service, and @mount is not included ✓ SystemCallFilter=~@raw-io System call allow list defined for service, and @raw-io is not included ✓ SystemCallFilter=~@reboot System call allow list defined for service, and @reboot is not included ✓ SystemCallFilter=~@swap System call allow list defined for service, and @swap is not included ✗ SystemCallFilter=~@privileged System call allow list defined for service, and @privileged is included (e.g. setgroups is allowed) 0.2 ✓ SystemCallFilter=~@resources System call allow list defined for service, and @resources is not included ✓ AmbientCapabilities= Service process does not receive ambient capabilities ✓ CapabilityBoundingSet=~CAP_AUDIT_* Service has no audit subsystem access ✓ CapabilityBoundingSet=~CAP_KILL Service cannot send UNIX signals to arbitrary processes ✓ CapabilityBoundingSet=~CAP_MKNOD Service cannot create device nodes ✓ CapabilityBoundingSet=~CAP_NET_(BIND_SERVICE|BROADCAST|RAW) Service has no elevated networking privileges ✓ CapabilityBoundingSet=~CAP_SYSLOG Service has no access to kernel logging ✓ CapabilityBoundingSet=~CAP_SYS_(NICE|RESOURCE) Service has no privileges to change resource use parameters ✓ RestrictNamespaces=~CLONE_NEWCGROUP Service cannot create cgroup namespaces ✓ RestrictNamespaces=~CLONE_NEWIPC Service cannot create IPC namespaces ✓ RestrictNamespaces=~CLONE_NEWNET Service cannot create network namespaces ✓ RestrictNamespaces=~CLONE_NEWNS Service cannot create file system namespaces ✓ RestrictNamespaces=~CLONE_NEWPID Service cannot create process namespaces ✓ RestrictRealtime= Service realtime scheduling access is restricted ✓ SystemCallFilter=~@cpu-emulation System call allow list defined for service, and @cpu-emulation is not included ✓ SystemCallFilter=~@obsolete System call allow list defined for service, and @obsolete is not included ✗ RestrictAddressFamilies=~AF_NETLINK Service may allocate netlink sockets 0.1 ✗ RootDirectory=/RootImage= Service runs within the host's root directory 0.1 ✓ SupplementaryGroups= Service has no supplementary groups ✓ CapabilityBoundingSet=~CAP_MAC_* Service cannot adjust SMACK MAC ✓ CapabilityBoundingSet=~CAP_SYS_BOOT Service cannot issue reboot() ✓ Delegate= Service does not maintain its own delegated control group subtree ✓ LockPersonality= Service cannot change ABI personality ✓ MemoryDenyWriteExecute= Service cannot create writable executable memory mappings ✓ RemoveIPC= Service user cannot leave SysV IPC objects around ✓ RestrictNamespaces=~CLONE_NEWUTS Service cannot create hostname namespaces ✓ UMask= Files created by service are accessible only by service's own user by default ✓ CapabilityBoundingSet=~CAP_LINUX_IMMUTABLE Service cannot mark files immutable ✓ CapabilityBoundingSet=~CAP_IPC_LOCK Service cannot lock memory into RAM ✓ CapabilityBoundingSet=~CAP_SYS_CHROOT Service cannot issue chroot() ✓ ProtectHostname= Service cannot change system host/domainname ✓ CapabilityBoundingSet=~CAP_BLOCK_SUSPEND Service cannot establish wake locks ✓ CapabilityBoundingSet=~CAP_LEASE Service cannot create file leases ✓ CapabilityBoundingSet=~CAP_SYS_PACCT Service cannot use acct() ✓ CapabilityBoundingSet=~CAP_SYS_TTY_CONFIG Service cannot issue vhangup() ✓ CapabilityBoundingSet=~CAP_WAKE_ALARM Service cannot program timers that wake up the system ✗ RestrictAddressFamilies=~AF_UNIX Service may allocate local sockets 0.1 ✓ ProcSubset= Service has no access to non-process /proc files (/proc subset=) → Overall exposure level for ircd-irc2.service: 1.3 OK 🙂