"Cherry-pick" (manually) some of the refactoring.
This commit is contained in:
parent
c5dc76f8eb
commit
e46a378460
1 changed files with 204 additions and 187 deletions
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@ -83,26 +83,20 @@ function check_installed() {
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fi
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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=$(mktemp -d)
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# Suppress output of dir stack.
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pushd "${tmpdir}" > /dev/null
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touch "${banlist}"
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function print_help() {
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cat <<ENDOFHELP
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Usage: $(basename $0) [OPTION...]
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-a, --auto[=LIMIT] Enable the autopilot for automatically banning chinese IP
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addresses (whois output must contain "source: APNIC" and
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"country: CN").
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-a, --auto[=LIMIT] Enable the autopilot for automatically banning IP
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addresses of the desired country (see also -c option).
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When LIMIT is given, only auto-ban IP addresses with at
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least LIMIT current connections.
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When LIMIT is omitted, assume LIMIT=1.
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-j, --jail=JAIL Specify the JAIL to use for banning the IP addresses. If
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not set, uses 'apache-auth'.
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-c, --country=COUNTRY The country-code to block; defaults to 'CN' (China).
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-j, --jail=JAIL Specify the JAIL to use for banning the IP addresses.
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Defaults to 'apache-auth'.
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-n, --netmask=SIZE SIZE defines the subnet size in bytes to be analyzed.
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Valid values are:
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@ -129,8 +123,28 @@ function exec_as_root() {
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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. ".0.0/16"
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ext="$2"
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rm -f "${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}"* ]] ; then
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echo "Considering ${address}."
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echo "${address}" >> "${filtered}"
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else
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echo "IGNORING ${address}, already banned."
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fi
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done 3< "${file}"
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mv "${filtered}" "${file}"
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}
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function parse_command_line_args() {
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TEMP=$(getopt -o 'a::,j:,n:,h' -l 'auto::,jail:,netmask:,help' -- "$@")
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TEMP=$(getopt -o 'a::,c:,j:,n:,h' -l 'auto::,country:,jail:,netmask:,help' -- "$@")
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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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@ -157,6 +171,10 @@ function parse_command_line_args() {
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esac
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shift
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;;
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'-c'|'--country')
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bancountry="$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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@ -199,10 +217,164 @@ function parse_command_line_args() {
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done
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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 whois request is made. The user can then choose to
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# ban or ignore the address. Addresses chosen to be banned are appended to the
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# $banlist.
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################################################################################
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function process_file () {
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local file="${1}"
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local line=''
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local count=0
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local addr=''
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local banaction=''
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local nline=1
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local country_cn=1
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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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addr="$(echo "${line}" | cut -d' ' -f3-)${ext}"
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set_highlight_color "${count}"
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if [[ autopilot -eq 0 ]] ; then
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whois "${addr}" | tee "${whoisoutput}"
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else
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whois "${addr}" > "${whoisoutput}"
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fi
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grep -iq "^country: *${bancountry}$" "${whoisoutput}"
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country_cn=$?
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echo -en "Address ${bold}$((nline++)) of ${nlines}${reset}: \
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Found '${blue}${addr}${reset}' ${hilite}${count}${reset} times."
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if [[ ${autopilot} -eq 0 ]] ; then
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echo -en "Ban [y/N/s=No, and skip remaining]? "
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read banaction
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else
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if [[ ${country_cn} -eq 0 ]] ; 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 "${banaction}" in
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"s" | "S" )
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echo -e "Not banning '${blue}${addr}${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 -e "Adding '${blue}${addr}${reset}' to \
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banlist."
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echo "${addr}" >> "${banlist}"
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;;
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"n" | "N" | * )
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echo -e "Not banning '${blue}${addr}${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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# Suppress output of dir stack.
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pushd "${tmpdir}" > /dev/null
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touch "${banlist}"
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check_installed "sudo" "app-admin/sudo"
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check_installed "fail2ban-client" "net-analyzer/fail2ban"
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check_installed "whois" "net-misc/whois"
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check_installed "cut" "sys-apps/coreutils"
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check_installed "id" "sys-apps/coreutils"
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check_installed "sort" "sys-apps/coreutils"
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check_installed "touch" "sys-apps/coreutils"
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check_installed "tr" "sys-apps/coreutils"
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check_installed "uniq" "sys-apps/coreutils"
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check_installed "grep" "sys-apps/grep"
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check_installed "sponge" "sys-apps/moreutils"
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check_installed "netstat" "sys-apps/net_tools"
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check_installed "getopt" "sys-apps/util-linux"
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# Parse the command line options
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autopilot=0
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netmask=0
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jail="apache-auth"
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bancountry="CN"
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parse_command_line_args "$@"
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@ -220,26 +392,6 @@ cut -d. -f1-3 "${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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function filter() {
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# list of current connections
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file="$1"
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# subnet extension, e.g. ".0.0/16"
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ext="$2"
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rm -f "${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}"* ]] ; then
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echo "Considering ${address}."
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echo "${address}" >> "${filtered}"
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else
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echo "IGNORING ${address}, already banned."
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fi
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done 3< "${file}"
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mv "${filtered}" "${file}"
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}
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# Filter already banned addresses
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filter "${file32}" "${ext32}"
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filter "${file24}" "${ext24}"
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@ -305,143 +457,8 @@ unset TEMP
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echo "Processing ${file}."
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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 setHilite() {
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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 whois request is made. The user can then choose to
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# ban or ignore the address. Addresses chosen to be banned are appended to the
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# $banlist.
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################################################################################
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function processFile () {
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local file="${1}"
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local line=''
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local count=0
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local addr=''
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local banaction=''
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local nline=1
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local country_cn=1
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local source_apnic=1
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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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addr="$(echo "${line}" | cut -d' ' -f3-)${ext}"
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setHilite "${count}"
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if [[ autopilot -eq 0 ]] ; then
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whois "${addr}" | tee "${whoisoutput}"
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else
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whois "${addr}" > "${whoisoutput}"
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fi
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grep -iq "^country: *cn$" "${whoisoutput}"
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country_cn=$?
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grep -iq "^source: *apnic$" "${whoisoutput}"
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source_apnic=$?
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echo -en "Address ${bold}$((nline++)) of ${nlines}${reset}: \
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Found '${blue}${addr}${reset}' ${hilite}${count}${reset} times."
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if [[ ${autopilot} -eq 0 ]] ; then
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echo -en "Ban [y/N/s=No, and skip remaining]? "
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read banaction
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else
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if [[ ${country_cn} -eq 0 && ${source_apnic} -eq 0 ]] ; 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 "${banaction}" in
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"s" | "S" )
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echo -e "Not banning '${blue}${addr}${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 -e "Adding '${blue}${addr}${reset}' to \
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banlist."
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echo "${addr}" >> "${banlist}"
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;;
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"n" | "N" | * )
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echo -e "Not banning '${blue}${addr}${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 ${file}."
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}
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# Invoke the processing function on the chosen file.
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processFile "${file}"
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process_file "${file}"
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echo "These are the addresses to be banned:"
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cat "${banlist}"
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Reference in a new issue