672 lines
19 KiB
Bash
Executable file
672 lines
19 KiB
Bash
Executable file
#!/bin/sh
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################################################################################
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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 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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# command line parameter. #
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# Addresses (or subnets) are presented to the user in order of descending #
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# connection count. For each address (or subnet), the user can choose to ban #
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# or ignore it. Addresses (or subnets) chosen to be banned will be blocked by #
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# a configurable jail of fail2ban. #
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# Author: Manuel Friedli, <manuel@fritteli.ch> #
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# This script is licenced under the GNU General Public Licence, version 3 or #
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# later. #
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# #
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################################################################################
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################################################################################
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# #
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# Prerequisites: #
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# - app-admin/sudo (`sudo`) #
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# - dev-lang/python:3.8 (`python`) #
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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/util-linux (`getopt`) #
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# #
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################################################################################
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# Store the start time; this enables us to output the total runtime at the end.
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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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dependencies=(
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"sudo" "app-admin/sudo"
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"python" "dev-lang/python:3.8"
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"fail2ban-client" "net-analyzer/fail2ban"
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"cut" "sys-apps/coreutils"
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"id" "sys-apps/coreutils"
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"sort" "sys-apps/coreutils"
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"touch" "sys-apps/coreutils"
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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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"getopt" "sys-apps/util-linux"
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)
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# These suffixes must be appended to the respective addresses and subnets.
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suffix8="/8"
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suffix16="/16"
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suffix24="/24"
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suffix32="/32"
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ext8=".0.0.0"
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ext16=".0.0"
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ext24=".0"
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ext32=""
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# Define some constants to format the output in a colorful way.
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red="$(printf '\033[38;2;255;0;43m')"
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yellow="$(printf '\033[38;2;255;204;0m')"
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green="$(printf '\033[38;2;0;179;89m')"
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blue="$(printf '\033[38;2;0;85;255m')"
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bold="$(printf '\033[1m')"
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reset="$(printf '\033[0m')"
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# Clean up when the script exits.
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trap 'sudo -k 2>/dev/null >&2; rm -r ${tmpdir}' EXIT
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function is_installed() {
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which "${1}" 2>/dev/null >&2
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return $?
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}
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function print_missing_dependency() {
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local command="${1}"
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local package="${2}"
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echo "${red}Command ${bold}${command}${reset}${red} not found.${reset} Please install package ${blue}${package}${reset}." >&2
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}
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function check_dependencies() {
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local arraylength=${#dependencies[@]}
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local res=
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local command=
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local package=
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# 0: true, all installed; 1: false, at least one command/package missing
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local all_installed=0
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for ((i = 0; i < ${arraylength}; i += 2)); do
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command="${dependencies[$i]}"
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package="${dependencies[$i + 1]}"
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is_installed "${command}" "${package}"
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res=$?
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if [[ ${res} -ne 0 ]]; then
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print_missing_dependency "${command}" "${package}"
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all_installed=1
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fi
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done
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return ${all_installed}
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}
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function print_help() {
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cat <<ENDOFHELP
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Usage: $(basename $0) -d FILE [OPTION...]
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${bold}Mandatory options:${reset}
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-d, --database=FILE The path to the GeoIP2 database file (must
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be either country or city database).
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${bold}Optional options:${reset}
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-a, --auto[=LIMIT] Enable the autopilot for automatically
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banning IP addresses of the desired
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countries (see also -c option).
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When LIMIT is given, only auto-ban IP
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addresses with at least LIMIT current
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connections.
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When LIMIT is omitted, assume LIMIT=1.
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-c, --country=COUNTRY[,COUNTRY...] The country-codes to block as a list of
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comma-separated values; defaults to 'CN'
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(China).
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-e, --dependencies Check if all required dependencies are
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installed. If all dependencies are found,
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the program terminates with exit code 0.
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Otherwise, missing dependencies are
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printed to stderr and the program
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terminates with exit code 1.
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-f, --config-file=FILENAME Specify the full path to the configuration
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file. If omitted, all options are read
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from the command line.
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Any parameter specified on the command
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line takes precedence over configuration
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option read from the file.
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-j, --jail=JAIL Specify the JAIL to use for banning the IP
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addresses.
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Defaults to 'apache-auth'.
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-n, --netmask=SIZE SIZE defines the subnet size in bytes to
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be analyzed.
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Valid values are:
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- 1 or 8 for class A networks (X.0.0.0/8)
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- 2 or 16 for class B networks (X.X.0.0/16)
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- 3 or 24 for class C networks (X.X.X.0/24)
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- 4 or 32 for class D networks (X.X.X.X/32)
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-p, --port=PORT The desired port to monitor.
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Defaults to 443 (https).
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-h, --help Show this help message
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Mandatory or optional arguments to long options are also mandatory or optional
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for any corresponding short options.
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When invoked without optional options, the autopilot is disabled and the
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netmask SIZE is inquired interactively.
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ENDOFHELP
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}
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function exec_as_root() {
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if [[ $(id -un) == "root" ]]; then
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"$@"
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else
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sudo "$@"
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fi
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}
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function filter() {
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# list of current connections
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file="${1}"
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# subnet extension, e.g. ".0.0"
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ext="${2}"
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# subnet suffix, e.g. "/16"
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suffix="${3}"
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rm -f "${filtered}"
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touch "${filtered}"
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# Reject already banned addresses
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while read -r -u3 address; do
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if [[ "${banned}" != *"${address}${ext}${suffix}"* ]]; then
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echo "${address}" >>"${filtered}"
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else
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echo "IGNORING ${address}${ext}${suffix}, already banned."
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fi
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done 3<"${file}"
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mv "${filtered}" "${file}"
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}
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function set_default_values() {
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if [[ -z "${autopilot}" ]]; then
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autopilot=0
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fi
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if [[ -z "${bancountries}" ]]; then
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bancountries=("CN")
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fi
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if [[ -z "${jail}" ]]; then
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jail="apache-auth"
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fi
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if [[ -z "${netmask}" ]]; then
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netmask=0
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fi
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if [[ -z "${port}" ]]; then
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port=443
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fi
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}
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function parse_config_file() {
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source "${configfile}"
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if [[ -z "${autopilot}" ]]; then
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autopilot="${AUTOPILOT}"
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fi
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if [[ -z "${bancountries}" ]]; then
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bancountries=(${COUNTRIES[@]})
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fi
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if [[ -z "${database}" ]]; then
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database="${DATABASE_FILE}"
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fi
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if [[ -z "${jail}" ]]; then
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jail="${JAIL}"
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fi
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if [[ -z "${netmask}" ]]; then
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netmask="${NETMASK}"
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fi
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if [[ -z "${port}" ]]; then
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port="${PORT}"
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fi
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}
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function parse_command_line_args() {
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TEMP=$(getopt -o 'a::,c:,d:,e,f:,j:,n:,p:,h' -l 'auto::,country:,database:,dependencies,config-file:,jail:,netmask:,port:,help' -- "$@")
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if [ $? -ne 0 ]; then
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echo 'Error parsing command line options. Terminating. Invoke with --help for help.' >&2
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exit 1
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fi
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eval set -- "${TEMP}"
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unset TEMP
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while true; do
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case "${1}" in
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'-a' | '--auto')
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case "${2}" in
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'')
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autopilot=1
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;;
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*)
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autopilot="$2"
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;;
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esac
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shift
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;;
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'-c' | '--country')
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IFS=',' read -ra bancountries <<<"${2}"
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shift
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;;
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'-d' | '--database')
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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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check_dependencies
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exit $?
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;;
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'-f' | '--config-file')
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configfile="${2}"
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shift
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;;
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'-j' | '--jail')
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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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'1')
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netmask=8
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;;
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'2')
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netmask=16
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;;
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'3')
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netmask=24
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;;
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'4')
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netmask=32
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;;
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*)
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netmask="${2}"
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;;
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esac
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shift
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;;
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'-p' | '--port')
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port="${2}"
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shift
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;;
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'-h' | '--help')
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print_help
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exit
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;;
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'--')
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shift
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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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exit 1
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;;
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esac
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shift
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done
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# If the config file option is set, parse the config file.
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if [[ ! -z ${configfile+x} ]]; then
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if [[ ! -f "${configfile}" || ! -r "${configfile}" ]]; then
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echo "Can not read configuration file '${2}'. Invoke with --help for help." >&2
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exit 1
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fi
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parse_config_file
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fi
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# Here, we set the default values for all options that have not been set yet.
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set_default_values
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}
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function validate_parameter_values() {
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# GeoIP-Database
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if [[ -z "${database}" ]]; then
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echo "No GeoIP database specified. Invoke with --help for more information." >&2
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exit 1
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fi
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if [[ ! -f "${database}" || ! -r "${database}" ]]; then
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echo "Database '${database}' is not accessible." >&2
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exit 1
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fi
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# Autopilot
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case "${autopilot}" in
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*[!0-9]*)
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echo "Invalid value for parameter 'auto' / 'AUTOPILOT': '${autopilot}'." >&2
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echo "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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# Countries
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if [[ -z ${bancountries[@]// /} ]]; then
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echo "Invalid value for parameter 'country' / 'COUNTRIES': '${bancountries[*]}'." >&2
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echo "Invoke with --help for help." >&2
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exit 1
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fi
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# Jail
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if [[ -z "${jail}" ]]; then
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echo "Invalid value for parameter 'jail' / 'JAIL': '${jail}'." >&2
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echo "Invoke with --help for help." >&2
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exit 1
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fi
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# Netmask
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case "${netmask}" in
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'0' | '8' | '16' | '24' | '32')
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# Everything OK.
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;;
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*)
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echo "Invalid value for parameter 'netmask': '${2}'." >&2
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echo "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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# Port
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case "${port}" in
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*[!0-9]*)
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echo "Invalid value for parameter 'port' / 'PORT': '${autopilot}'." >&2
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echo "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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if [[ ${port} -lt 0 || ${port} -gt 65535 ]]; then
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echo "Invalid value for parameter 'port' / 'PORT': '${autopilot}'." >&2
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echo "Value must be between 0 ... 65535 (inclusive)." >&2
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echo "Invoke with --help for help." >&2
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exit 1
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fi
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}
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################################################################################
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# Set the highlighting color for the address count. The color goes from green
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# (low count) over yellow (intermediate count) to red (high count). Depending
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# on the size of the subnet (/8, /16, /24 or /32), the transitions from one
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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=${1}
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case "${choice}" in
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"1")
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# /32: 0 <= green < 3 <= yellow < 5 <= red
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if [ ${count} -ge 5 ]; then
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hilite="${red}"
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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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fi
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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 [ ${count} -ge 13 ]; then
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hilite="${red}"
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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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fi
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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 [ ${count} -ge 25 ]; then
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hilite="${red}"
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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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fi
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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 [ ${count} -ge 49 ]; then
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hilite="${red}"
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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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fi
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;;
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*)
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# ???: We should never get here. As a fall-back, just use no
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# highlighting.
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hilite=""
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;;
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esac
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}
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################################################################################
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# Process the file denoted by $1. For each line in the file, the count and the
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# address are displayed and a lookup for the IP addresses country is made in the
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# GeoIP database. The user can then choose to ban or ignore the address.
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# Addresses chosen to be banned are appended to the $banlist.
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################################################################################
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function process_file() {
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local file="${1}"
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local line=''
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local count=0
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local addronly=''
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local addrwithsuffix=''
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local banaction=''
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local nline=1
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local country=
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# Read the contents from filedescriptor 3 (important: Don's use the
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# standard filedescriptor because we need to handle user input from
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# within the loop).
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while IFS= read -r -u3 line; do
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line="$(echo "${line}" | tr -s '[:blank:]')"
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count="$(echo "${line}" | cut -d' ' -f2)"
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addronly="$(echo "${line}" | cut -d' ' -f3-)${ext}"
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addrwithsuffix="${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 [[ ${autopilot} -eq 0 ]]; then
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echo "Country: '${yellow}${country}${reset}'"
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fi
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echo -n "Address ${bold}$((nline++)) of ${nlines}${reset}: \
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Found '${blue}${addrwithsuffix}${reset}' ${hilite}${count}${reset} times."
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if [[ ${autopilot} -eq 0 ]]; then
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echo -n " Ban [y/N/s=No, and skip remaining]? "
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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 ${autopilot} ]]; then
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echo -en "\n${red}Autopilot active. ${reset}"
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banaction=y
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else
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echo -e "\n${yellow}Autopilot active. Ignoring remaining addresses due to limit of ${autopilot}.${reset}"
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return
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fi
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else
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if [[ ${count} -ge ${autopilot} ]]; then
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echo -en "\n${green}Autopilot active. ${reset}"
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banaction=n
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else
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echo -e "\n${green}Autopilot active.${reset} ${yellow}Ignoring remaining addresses due to limit of ${autopilot}.${reset}"
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return
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fi
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fi
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fi
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case "${banaction}" in
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"s" | "S")
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echo "Not banning '${blue}${addrwithsuffix}${reset}', \
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skipping remaining addresses."
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return
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;;
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"y" | "Y")
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echo "Adding '${blue}${addrwithsuffix}${reset}' to \
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banlist (country=${yellow}${country}${reset})."
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echo "${addrwithsuffix}" >>"${banlist}"
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;;
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"n" | "N" | *)
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echo "Not banning '${blue}${addrwithsuffix}${reset}' (country=${yellow}${country}${reset})."
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;;
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esac
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# Here goes: Pipe the file contents via filedescriptor 3.
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done 3<"${file}"
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echo "Processed all entries in ${file}."
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}
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# Create a temp directory, chdir into it and create the (initially empty)
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# banlist file.
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tmpdir="$(mktemp -d)"
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# Set up all file paths
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curdir="$(dirname "$0")"
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# Define the files that will contain the addresses an subnets.
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fileraw="${tmpdir}/raw-http.txt"
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filtered="${tmpdir}/filtered-http.txt"
|
|
file8="${tmpdir}/sorted-http-8.txt"
|
|
file16="${tmpdir}/sorted-http-16.txt"
|
|
file24="${tmpdir}/sorted-http-24.txt"
|
|
file32="${tmpdir}/sorted-http-32.txt"
|
|
# This file will contain the addresses to be banned.
|
|
banlist="${tmpdir}/banlist.txt"
|
|
|
|
touch "${banlist}"
|
|
|
|
# Parse the command line options
|
|
autopilot=
|
|
netmask=
|
|
jail=
|
|
bancountries=
|
|
database=
|
|
port=
|
|
|
|
parse_command_line_args "$@"
|
|
validate_parameter_values
|
|
|
|
check_dependencies
|
|
dependencies_ok=$?
|
|
if [[ ${dependencies_ok} -ne 0 ]]; then
|
|
exit ${dependencies_ok}
|
|
fi
|
|
|
|
# List already banned addresses in the chosen jail
|
|
banned="$(exec_as_root fail2ban-client get "${jail}" banip)"
|
|
|
|
# Determine the current connections to the desired port; store the raw data in
|
|
# $fileraw.
|
|
connections=$(ss -HOn state established "( sport = :${port} )" | tr -s '[:blank:]' | cut -d' ' -f5)
|
|
|
|
# IPv6-mapped-IPv4: [::ffff:192.168.0.1]:443
|
|
echo "${connections}" | grep '^\[::ffff:' - | cut -d: -f4 | cut -d] -f1 | grep -v '^$' >"${fileraw}"
|
|
# Pure IPv4: 192.168.0.1:443
|
|
echo "${connections}" | grep -v '^\[' - | cut -d: -f1 | grep -v '^$' >>"${fileraw}"
|
|
|
|
# Group and sort the data into the subnet-specific files.
|
|
sort "${fileraw}" >"${file32}"
|
|
cut -d. -f1-3 "${fileraw}" | sort >"${file24}"
|
|
cut -d. -f1-2 "${fileraw}" | sort >"${file16}"
|
|
cut -d. -f1 "${fileraw}" | sort >"${file8}"
|
|
|
|
# Filter already banned addresses
|
|
filter "${file32}" "${ext32}" "${suffix32}"
|
|
filter "${file24}" "${ext24}" "${suffix24}"
|
|
filter "${file16}" "${ext16}" "${suffix16}"
|
|
filter "${file8}" "${ext8}" "${suffix8}"
|
|
|
|
# Determine the number of connections per address
|
|
uniq -c "${file32}" | sort -rn | sponge "${file32}"
|
|
uniq -c "${file24}" | sort -rn | sponge "${file24}"
|
|
uniq -c "${file16}" | sort -rn | sponge "${file16}"
|
|
uniq -c "${file8}" | sort -rn | sponge "${file8}"
|
|
|
|
# Determine the number of entries per file.
|
|
nlines32=$(cat "${file32}" | wc -l)
|
|
nlines24=$(cat "${file24}" | wc -l)
|
|
nlines16=$(cat "${file16}" | wc -l)
|
|
nlines8=$(cat "${file8}" | wc -l)
|
|
|
|
if [ ${netmask} -eq 0 ]; then
|
|
# Now let the user choose which file to process.
|
|
echo "We've got:"
|
|
echo "[1] 8bit: ${nlines8} entries"
|
|
echo "[2] 16bit: ${nlines16} entries"
|
|
echo "[3] 24bit: ${nlines24} entries"
|
|
echo "[4] 32bit: ${nlines32} entries"
|
|
read -p 'Which one do you want to work with (q=Quit) [1-4]? ' choice
|
|
|
|
# Based on the user's choice, initialize the variables $file, $ext and
|
|
# $nlines, which will be used after this point. Also, $choice will be
|
|
# used to color the output based on subnet-type.
|
|
case "${choice}" in
|
|
"1")
|
|
netmask=8
|
|
;;
|
|
"2")
|
|
netmask=16
|
|
;;
|
|
"3")
|
|
netmask=24
|
|
;;
|
|
"4")
|
|
netmask=32
|
|
;;
|
|
"Q" | "q")
|
|
echo "You chose to abort. That's fine! Have a nice day!"
|
|
exit
|
|
;;
|
|
*)
|
|
echo "Invalid input: ${choice}. I'm out of here."
|
|
exit 1
|
|
;;
|
|
esac
|
|
fi
|
|
|
|
# Now initialize the variables $file, $ext and $nlines based on the chosen $netmask
|
|
TEMP="file${netmask}"
|
|
file="${!TEMP}"
|
|
TEMP="ext${netmask}"
|
|
ext="${!TEMP}"
|
|
TEMP="suffix${netmask}"
|
|
suffix="${!TEMP}"
|
|
TEMP="nlines${netmask}"
|
|
nlines="${!TEMP}"
|
|
unset TEMP
|
|
|
|
echo "Processing ${file}."
|
|
|
|
# Invoke the processing function on the chosen file.
|
|
process_file "${file}"
|
|
|
|
echo "These are the addresses to be banned:"
|
|
cat "${banlist}"
|
|
|
|
# Make sure the user has to (re)-identify him- or herself before actually
|
|
# banning anything.
|
|
sudo -k
|
|
|
|
# Iterate over all addresses in $banlist and invoke fail2ban-client on each
|
|
# one of them.
|
|
while read -r addrwithsuffix; do
|
|
echo "Banning ${addrwithsuffix} ..."
|
|
exec_as_root fail2ban-client set "${jail}" banip "${addrwithsuffix}"
|
|
done <"${banlist}"
|
|
|
|
end="$(date +%s)"
|
|
|
|
echo "${green}All done in $((end - start)) seconds!${reset}"
|