Merge pull request 'feature/ss-instead-of-netstat' (#2) from feature/ss-instead-of-netstat into master
Reviewed-on: #2
This commit is contained in:
commit
b65bd6ea55
1 changed files with 176 additions and 174 deletions
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@ -3,7 +3,7 @@
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# #
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# Try and prevent apache overloads by banning IP addresses that have (too) #
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# many open connections. #
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# This script uses netstat to determine the connections to a configurable port #
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# This script uses ss to determine the connections to a configurable port #
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# on the host machine and provides automated GeoIP information retrieval based #
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# the address or the /24-, /16- or /8-subnet thereof. A GeoIP city- or country #
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# database must be installed separately and is provided to the script via a #
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@ -26,8 +26,8 @@
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# - net-analyzer/fail2ban (`fail2ban-client`) #
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# - sys-apps/coreutils (`cut`, `id`, `sort`, `touch`, `tr`, `uniq`) #
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# - sys-apps/grep (`grep`) #
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# - sys-apps/iproute2 (`ss`) #
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# - sys-apps/moreutils (`sponge`) #
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# - sys-apps/net-tools (`netstat`) #
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# - sys-apps/util-linux (`getopt`) #
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# #
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################################################################################
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@ -36,7 +36,7 @@
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MY_IP="94.199.214.20"
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# After this point, no editing is required.
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start=$(date +%s)
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start="$(date +%s)"
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# Dependencies of this script. Simple array with the following structure:
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# (command package [...])
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@ -51,8 +51,8 @@ dependencies=(
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"tr" "sys-apps/coreutils"
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"uniq" "sys-apps/coreutils"
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"grep" "sys-apps/grep"
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"ss" "sys-apps/iproute2"
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"sponge" "sys-apps/moreutils"
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"netstat" "sys-apps/net-tools"
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"getopt" "sys-apps/util-linux"
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)
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@ -83,8 +83,8 @@ function is_installed() {
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}
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function print_missing_dependency() {
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local command="$1"
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local package="$2"
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local command="${1}"
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local package="${2}"
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echo "${red}Command ${bold}${command}${reset}${red} not found.${reset} Please install package ${blue}${package}${reset}." >&2
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}
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@ -102,7 +102,7 @@ function check_dependencies() {
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package="${dependencies[$i + 1]}"
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is_installed "${command}" "${package}"
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res=$?
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if [[ $res -ne 0 ]] ; then
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if [[ ${res} -ne 0 ]]; then
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print_missing_dependency "${command}" "${package}"
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all_installed=1
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fi
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@ -174,11 +174,11 @@ function exec_as_root() {
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function filter() {
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# list of current connections
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file="$1"
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file="${1}"
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# subnet extension, e.g. ".0.0"
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ext="$2"
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ext="${2}"
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# subnet suffix, e.g. "/16"
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suffix="$3"
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suffix="${3}"
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rm -f "${filtered}"
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touch "${filtered}"
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@ -206,14 +206,14 @@ function parse_command_line_args() {
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unset TEMP
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while true; do
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case "$1" in
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case "${1}" in
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'-a' | '--auto')
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case "$2" in
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case "${2}" in
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'')
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autopilot=1
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;;
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*[!0-9]*)
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echo "Invalid argument for parameter 'auto': '$2'. Invoke with --help for help." >&2
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echo "Invalid argument for parameter 'auto': '${2}'. Invoke with --help for help." >&2
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exit 1
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;;
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*)
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@ -223,15 +223,15 @@ function parse_command_line_args() {
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shift
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;;
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'-c' | '--country')
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IFS=',' read -ra bancountries <<< "$2"
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if [[ -z ${bancountries[@]// } ]] ; then
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echo "Invalid argument for parameter 'country': '$2'. Invoke with --help for help." >&2
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IFS=',' read -ra bancountries <<<"${2}"
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if [[ -z ${bancountries[@]// /} ]]; then
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echo "Invalid argument for parameter 'country': '${2}'. Invoke with --help for help." >&2
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exit 1
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fi
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shift
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;;
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'-d' | '--database')
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database="$2"
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database="${2}"
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shift
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;;
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'-e' | '--dependencies')
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@ -239,11 +239,11 @@ function parse_command_line_args() {
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exit $?
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;;
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'-j' | '--jail')
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jail="$2"
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jail="${2}"
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shift
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;;
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'-n' | '--netmask')
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case "$2" in
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case "${2}" in
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'1' | '8')
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netmask=8
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;;
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@ -257,14 +257,14 @@ function parse_command_line_args() {
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netmask=32
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;;
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*)
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echo "Invalid argument for parameter 'netmask': '$2'. Invoke with --help for help." >&2
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echo "Invalid argument for parameter 'netmask': '${2}'. Invoke with --help for help." >&2
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exit 1
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;;
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esac
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shift
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;;
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'-p' | '--port')
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port="$2"
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port="${2}"
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shift
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;;
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'-h' | '--help')
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@ -276,7 +276,7 @@ function parse_command_line_args() {
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break
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;;
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*)
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echo "Unknown error on command line argument '$1'. Terminating." >&2
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echo "Unknown error on command line argument '${1}'. Terminating." >&2
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exit 1
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;;
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esac
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@ -301,13 +301,13 @@ function parse_command_line_args() {
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# color to the next happen at different values.
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################################################################################
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function set_highlight_color() {
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local count=$1
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local count=${1}
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case "${choice}" in
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"1")
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# /32: 0 <= green < 3 <= yellow < 5 <= red
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if [ $count -ge 5 ] ; then
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if [ ${count} -ge 5 ]; then
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hilite="${red}"
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elif [ $count -ge 3 ] ; then
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elif [ ${count} -ge 3 ]; then
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hilite="${yellow}"
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else
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hilite="${green}"
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@ -315,9 +315,9 @@ function set_highlight_color() {
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;;
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"2")
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# /24: 0 <= green < 7 <= yellow < 13 <= red
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if [ $count -ge 13 ] ; then
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if [ ${count} -ge 13 ]; then
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hilite="${red}"
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elif [ $count -ge 7 ] ; then
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elif [ ${count} -ge 7 ]; then
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hilite="${yellow}"
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else
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hilite="${green}"
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@ -325,9 +325,9 @@ function set_highlight_color() {
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;;
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"3")
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# /16: 0 <= green < 13 <= yellow < 25 <= red
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if [ $count -ge 25 ] ; then
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if [ ${count} -ge 25 ]; then
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hilite="${red}"
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elif [ $count -ge 13 ] ; then
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elif [ ${count} -ge 13 ]; then
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hilite="${yellow}"
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else
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hilite="${green}"
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@ -335,9 +335,9 @@ function set_highlight_color() {
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;;
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"4")
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# /8: 0 <= green < 21 <= yellow < 49 <= red
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if [ $count -ge 49 ] ; then
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if [ ${count} -ge 49 ]; then
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hilite="${red}"
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elif [ $count -ge 21 ] ; then
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elif [ ${count} -ge 21 ]; then
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hilite="${yellow}"
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else
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hilite="${green}"
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@ -376,7 +376,7 @@ function process_file () {
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addrwithsuffix="${addronly}${suffix}"
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set_highlight_color "${count}"
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country="$("${curdir}/geoip-lookup.py" -f "${database}" "${addronly}")"
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if [[ autopilot -eq 0 ]] ; then
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if [[ ${autopilot} -eq 0 ]]; then
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echo "Country: '${yellow}${country}${reset}'"
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fi
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echo -n "Address ${bold}$((nline++)) of ${nlines}${reset}: \
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@ -387,7 +387,7 @@ Found '${blue}${addrwithsuffix}${reset}' ${hilite}${count}${reset} times."
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read banaction
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else
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if [[ " ${bancountries[@]} " =~ " ${country} " ]]; then
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if [[ $count -ge $autopilot ]] ; then
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if [[ ${count} -ge ${autopilot} ]]; then
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echo -en "\n${red}Autopilot active. ${reset}"
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banaction=y
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else
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@ -395,7 +395,7 @@ Found '${blue}${addrwithsuffix}${reset}' ${hilite}${count}${reset} times."
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return
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fi
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else
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if [[ $count -ge $autopilot ]] ; then
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if [[ ${count} -ge ${autopilot} ]]; then
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echo -en "\n${green}Autopilot active. ${reset}"
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banaction=n
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else
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@ -427,7 +427,7 @@ banlist (country=${yellow}${country}${reset})."
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# Create a temp directory, chdir into it and create the (initially empty)
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# banlist file.
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tmpdir=$(mktemp -d)
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tmpdir="$(mktemp -d)"
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# Set up all file paths
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curdir="$(dirname "$0")"
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@ -440,8 +440,6 @@ file24="${tmpdir}/sorted-http-24.txt"
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file32="${tmpdir}/sorted-http-32.txt"
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# This file will contain the addresses to be banned.
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banlist="${tmpdir}/banlist.txt"
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# This file contains the output of the last invocation of whois
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whoisoutput="${tmpdir}/whois.txt"
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touch "${banlist}"
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@ -466,11 +464,15 @@ banned="$(exec_as_root fail2ban-client get "${jail}" banip)"
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# Determine the current connections to the desired port; store the raw data in
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# $fileraw.
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netstat -nt | grep "${MY_IP}:${port}" | tr -s '[:blank:]' | cut -d' ' -f5 \
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| cut -d: -f1 | sort > "${fileraw}"
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connections=$(ss -HOn state established "( sport = :${port} )" | tr -s '[:blank:]' | cut -d' ' -f5)
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# IPv6-mapped-IPv4: [::ffff:192.168.0.1]:443
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echo "${connections}" | grep '^\[::ffff:' - | cut -d: -f4 | cut -d] -f1 | grep -v '^$' >"${fileraw}"
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# Pure IPv4: 192.168.0.1:443
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echo "${connections}" | grep -v '^\[' - | cut -d: -f1 | grep -v '^$' >>"${fileraw}"
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# Group and sort the data into the subnet-specific files.
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cp "${fileraw}" "${file32}"
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sort "${fileraw}" >"${file32}"
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cut -d. -f1-3 "${fileraw}" | sort >"${file24}"
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cut -d. -f1-2 "${fileraw}" | sort >"${file16}"
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cut -d. -f1 "${fileraw}" | sort >"${file8}"
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@ -559,6 +561,6 @@ while read -r addrwithsuffix ; do
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exec_as_root fail2ban-client set "${jail}" banip "${addrwithsuffix}"
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done <"${banlist}"
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end=$(date +%s)
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end="$(date +%s)"
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echo "${green}All done in $((end - start)) seconds!${reset}"
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