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Add firewall section to check-config.sh (#13234)
* Add firewall section to check-config.sh Signed-off-by: Derek Nola <derek.nola@suse.com>
This commit is contained in:
Derek Nola
GitHub
parent
e91afa8cec
commit
54b792e6d5
1 changed files with 83 additions and 34 deletions
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@ -127,11 +127,19 @@ check_flags() {
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done
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}
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# check_command hide the output of where the command is found.
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# provide a second argument to print success/failure info
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check_command() {
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if command -v "$1" >/dev/null 2>&1; then
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wrap_good "$1 command" 'available'
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if [ -n "$2" ]; then
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wrap_good "$1 command" "$2"
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fi
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return 0
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else
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wrap_bad "$1 command" 'missing'
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if [ -n "$2" ]; then
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wrap_bad "$1 command" "$2"
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fi
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return 1
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fi
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}
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@ -261,6 +269,75 @@ echo
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fi
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}
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SUDO=
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[ $(id -u) -ne 0 ] && SUDO=sudo
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check_firewall_ports() {
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fw_prog="$1"
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tcp_ports="6443 10250 5001 2379 2380"
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udp_ports="8472 51820 51821"
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blocked_tcp_ports=""
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blocked_udp_ports=""
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open_ports=""
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# returns 0 if port is blocked
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is_blocked() {
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local port=$1 proto=$2
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if [ "$fw_prog" = "firewalld" ]; then
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! $SUDO firewall-cmd --list-ports | grep -q "$port/$proto"
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elif [ "$fw_prog" = "ufw" ]; then
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$SUDO ufw status | grep -q "$port/$proto\s\+DENY"
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else
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warning "unknown firewall program: $fw_prog"
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return 1
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fi
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}
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for port in $tcp_ports; do
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if is_blocked "$port" "tcp"; then
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blocked_tcp_ports="$blocked_tcp_ports $port "
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else
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open_ports="$open_ports $port "
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fi
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done
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for port in $udp_ports; do
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if is_blocked "$port" "udp"; then
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blocked_udp_ports="$blocked_udp_ports $port "
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else
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open_ports="$open_ports $port "
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fi
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done
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for port in $blocked_tcp_ports; do
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wrap_bad " - TCP Port $port is blocked"
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done
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for port in $blocked_udp_ports; do
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wrap_warn " - UDP Port $port is blocked" "Required for Flannel VXLAN/WireGuard"
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done
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for port in $open_ports; do
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wrap_good " - Port $port is open" 'ok'
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done
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}
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if check_command firewall-cmd; then
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if $SUDO firewall-cmd --state >/dev/null 2>&1; then
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echo
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echo 'Firewall:'
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wrap_warn "- firewalld" "is enabled"
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check_firewall_ports "firewalld"
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fi
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fi
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# Check for ufw
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if check_command ufw; then
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if $SUDO ufw status | grep -q "Status: active"; then
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echo
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echo 'Firewall:'
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wrap_warn "- ufw" "is enabled"
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check_firewall_ports "ufw"
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fi
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fi
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echo
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{
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@ -282,8 +359,6 @@ echo
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# ---
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SUDO=
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[ $(id -u) -ne 0 ] && SUDO=sudo
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lsmod | grep -q configs || $SUDO modprobe configs || true
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if [ -z "$CONFIG" ]; then
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@ -366,16 +441,16 @@ esac
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if [ "$(cat /sys/module/apparmor/parameters/enabled 2>/dev/null)" = 'Y' ]; then
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echo -n '- '
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if command -v apparmor_parser &> /dev/null; then
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if check_command apparmor_parser; then
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wrap_good 'apparmor' 'enabled and tools installed'
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else
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wrap_bad 'apparmor' 'enabled, but apparmor_parser missing'
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echo -n ' '
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if command -v apt-get &> /dev/null; then
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if check_command apt-get; then
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wrap_color '(use "apt-get install apparmor" to fix this)'
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elif command -v yum &> /dev/null; then
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elif check_command yum; then
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wrap_color '(your best bet is "yum install apparmor-parser")'
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elif command -v zypper &> /dev/null; then
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elif check_command zypper; then
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wrap_color '(your best bet is "zypper install apparmor-parser")'
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else
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wrap_color '(look for an "apparmor" package for your distribution)'
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@ -406,32 +481,6 @@ echo 'Optional Features:'
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check_flags USER_NS
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check_distro_userns
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}
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# {
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# check_flags MEMCG_SWAP MEMCG_SWAP_ENABLED
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# if [ -e /sys/fs/cgroup/memory/memory.memsw.limit_in_bytes ]; then
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# echo " $(wrap_color '(cgroup swap accounting is currently enabled)' bold black)"
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# elif is_set MEMCG_SWAP && ! is_set MEMCG_SWAP_ENABLED; then
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# echo " $(wrap_color '(cgroup swap accounting is currently not enabled, you can enable it by setting boot option "swapaccount=1")' bold black)"
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# fi
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# }
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# {
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# if is_set LEGACY_VSYSCALL_NATIVE; then
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# echo -n "- "; wrap_bad "CONFIG_LEGACY_VSYSCALL_NATIVE" 'enabled'
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# echo " $(wrap_color '(dangerous, provides an ASLR-bypassing target with usable ROP gadgets.)' bold black)"
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# elif is_set LEGACY_VSYSCALL_EMULATE; then
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# echo -n "- "; wrap_good "CONFIG_LEGACY_VSYSCALL_EMULATE" 'enabled'
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# elif is_set LEGACY_VSYSCALL_NONE; then
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# echo -n "- "; wrap_bad "CONFIG_LEGACY_VSYSCALL_NONE" 'enabled'
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# echo " $(wrap_color '(containers using eglibc <= 2.13 will not work. Switch to' bold black)"
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# echo " $(wrap_color ' "CONFIG_VSYSCALL_[NATIVE|EMULATE]" or use "vsyscall=[native|emulate]"' bold black)"
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# echo " $(wrap_color ' on kernel command line. Note that this will disable ASLR for the,' bold black)"
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# echo " $(wrap_color ' VDSO which may assist in exploiting security vulnerabilities.)' bold black)"
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# # else Older kernels (prior to 3dc33bd30f3e, released in v4.40-rc1) do
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# # not have these LEGACY_VSYSCALL options and are effectively
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# # LEGACY_VSYSCALL_EMULATE. Even older kernels are presumably
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# # effectively LEGACY_VSYSCALL_NATIVE.
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# fi
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# }
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if [ "$kernelMajor" -lt 4 ] || ( [ "$kernelMajor" -eq 4 ] && [ "$kernelMinor" -le 5 ] ); then
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check_flags MEMCG_KMEM
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