354 lines
9.5 KiB
Bash
354 lines
9.5 KiB
Bash
#!/bin/sh
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#
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# ipset Start and stop ipset firewall sets
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#
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# config: /etc/sysconfig/ipset-config
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IPSET_BIN=/usr/sbin/ipset
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IPSET_CONFIG=/etc/sysconfig/ipset-config
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IPSET_DATA_COMPAT=/etc/sysconfig/ipset
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IPSET_DATA_COMPAT_BACKUP=${IPSET_DATA_COMPAT}.save
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IPSET_DATA_DIR=/etc/sysconfig/ipset.d
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IPSET_DATA_DIR_BACKUP=${IPSET_DATA_DIR}.save
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IPSET_DATA_SAVED_FLAG=${IPSET_DATA_DIR}/.saved
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IPSET_LOCK=/run/ipset.lock
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IPSET_RUN=/run/ipset.run
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CLEAN_FILES=""
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trap "rm -rf \${CLEAN_FILES}" EXIT
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info() {
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echo "ipset: ${*}" >&2
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}
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warn() {
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echo "<4>ipset: ${*}" >&2
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}
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err() {
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echo "<3>ipset: ${*}" >&2
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}
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[ -x ${IPSET_BIN} ] || { err "Cannot execute ${IPSET_BIN}"; exit 1; }
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# Source ipset configuration
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# shellcheck source=ipset-config
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[ -f ${IPSET_CONFIG} ] && . ${IPSET_CONFIG}
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set -f
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lock() {
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CLEAN_FILES="${CLEAN_FILES} ${IPSET_LOCK}"
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until mkdir ${IPSET_LOCK} 2>/dev/null; do :; done
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}
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save() {
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fail=0
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# Make backups of existing configuration first, if any
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[ -d ${IPSET_DATA_DIR} ] && mv -Tf ${IPSET_DATA_DIR} ${IPSET_DATA_DIR_BACKUP}
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[ -f ${IPSET_DATA_COMPAT} ] && mv -Tf ${IPSET_DATA_COMPAT} ${IPSET_DATA_COMPAT_BACKUP}
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rm -f ${IPSET_DATA_SAVED_FLAG}
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# Save each set in a separate file
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mkdir -p ${IPSET_DATA_DIR}
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chmod 0700 ${IPSET_DATA_DIR}
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IFS="
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"
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for set in $(${IPSET_BIN} list -n -t); do
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# Empty name allowed, use ".set" as suffix. 'ipset save' doesn't
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# quote set names with spaces: if we have a space in the name,
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# work around this by quoting it ourselves in the output.
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# shellcheck disable=SC2003 # No POSIX equivalent to expr index
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if expr index "${set}" " " >/dev/null; then
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:> "${IPSET_DATA_DIR}/${set}.set"
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for line in $(${IPSET_BIN} save "${set}"); do
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create=0
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echo "${line}" | grep -q "^create " && create=1
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if [ $create -eq 1 ]; then
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line=${line#create *}
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else
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line=${line#add *}
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fi
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line=${line#${set} *}
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set="$(echo "${set}" | sed 's/"/\\"/g')"
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if [ $create -eq 1 ]; then
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echo "create \"${set}\" ${line}" >> "${IPSET_DATA_DIR}/${set}.set"
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else
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echo "add \"${set}\" ${line}" >> "${IPSET_DATA_DIR}/${set}.set"
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fi
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done
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else
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${IPSET_BIN} save "${set}" > "${IPSET_DATA_DIR}/${set}.set" || fail=1
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fi
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[ -f "${IPSET_DATA_DIR}/${set}.set" ] && chmod 600 "${IPSET_DATA_DIR}/${set}.set"
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[ $fail -eq 1 ] && err "Cannot save set ${set}" && unset IFS && return 1
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done
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touch ${IPSET_DATA_SAVED_FLAG} || { unset IFS; return 1; }
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unset IFS
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# Done: remove backups
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rm -rf ${IPSET_DATA_DIR_BACKUP}
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rm -rf ${IPSET_DATA_COMPAT_BACKUP}
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return 0
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}
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# Generate a grep regexp matching abbreviated command forms. E.g., for create:
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# \(c\|cr\|cre\|crea\|creat\|create\)
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cmd_short_expr() {
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out=
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cmd_len=1
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while [ "${cmd_len}" -le "${#1}" ]; do
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[ -z "${out}" ] && out='\(' || out="${out}"'\|'
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# shellcheck disable=SC2003 # No POSIX equivalent to expr substr
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out="${out}$(expr substr "${1}" 1 "${cmd_len}")"
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cmd_len=$((cmd_len + 1))
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done
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echo "${out}"'\)'
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}
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ipset_restore() {
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file="${1}"
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retfile="$(mktemp -q /tmp/ipset.XXXXXX)"
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CLEAN_FILES="${CLEAN_FILES} ${retfile}"
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# If restore fails due to invalid lines, remove them and retry
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while ! restore_err="$( (${IPSET_BIN} -f "${file}" -! restore 2>&1; echo $? >"${retfile}") | head -n1; exit "$(cat "${retfile}")" )"; do
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warn "${restore_err}"
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case ${restore_err#*: } in
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"No command specified"*)
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line="$(grep -m1 -n "^${restore_err##* }" "${file}")"
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line="${line%:*}"
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;;
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"Missing second mandatory argument to command "*)
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cmd="${restore_err##* }"
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cmd_expr="$(cmd_short_expr "${cmd}")"
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line="$(grep -n '^'"${cmd_expr}" "${file}" | grep -m1 -v '^[0-9]\+\:'"${cmd_expr}"'[[:blank:]]\+[^[:blank:]]\+[[:blank:]]\+[^[:blank:]]\+')"
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line="${line%:*}"
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;;
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"Missing mandatory argument to command "*)
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cmd="${restore_err##* }"
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cmd_expr="$(cmd_short_expr "${cmd}")"
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line="$(grep -n '^'"${cmd_expr}" "${file}" | grep -m1 -v '^[0-9]\+\:'"${cmd_expr}"'[[:blank:]]\+[^[:blank:]]\+')"
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line="${line%:*}"
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;;
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"Command "*"is invalid in restore mode"*)
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restore_err_cmd="${restore_err#*: }"
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restore_err_cmd="${restore_err_cmd#*\`}"
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restore_err_cmd="${restore_err_cmd%%\'*}"
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cmd="${restore_err_cmd##* }"
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cmd_expr="$(cmd_short_expr "${cmd}")"
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line="$(grep -m1 -ne '^'"${cmd_expr}"'[[:blank:]]\+' -e '^'"${restore_err_cmd}"'$' "${file}")"
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line="${line%:*}"
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;;
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"Error in line "*)
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line="${restore_err%: *}"
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line="${line##* }"
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;;
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*)
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rm "${retfile}"
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CLEAN_FILES="${CLEAN_FILES%* ${retfile}}"
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return 1
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;;
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esac
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[ -z "${line}" ] && return 1
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warn "Skipped invalid entry: $(sed "${line}q;d" "${file}")"
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sed -i -e "${line}d" "${file}"
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[ -s "${file}" ] || return 1
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done
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rm "${retfile}"
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CLEAN_FILES="${CLEAN_FILES%* ${retfile}}"
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}
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load() {
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if [ -f ${IPSET_DATA_SAVED_FLAG} ]; then
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# If we have a cleanly saved directory with all sets, we can
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# delete any left-overs and use it
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rm -rf ${IPSET_DATA_DIR_BACKUP}
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rm -f ${IPSET_DATA_COMPAT_BACKUP}
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else
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# If sets weren't cleanly saved, restore from backups
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[ -d ${IPSET_DATA_DIR_BACKUP} ] && rm -rf ${IPSET_DATA_DIR} && mv -Tf ${IPSET_DATA_DIR_BACKUP} ${IPSET_DATA_DIR}
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[ -f ${IPSET_DATA_COMPAT_BACKUP} ] && rm -f ${IPSET_DATA_COMPAT} && mv -Tf ${IPSET_DATA_COMPAT_BACKUP} ${IPSET_DATA_COMPAT}
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fi
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if [ ! -d ${IPSET_DATA_DIR} ] && [ ! -f ${IPSET_DATA_COMPAT} ]; then
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info "No existing configuration available, none loaded"
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touch ${IPSET_RUN}
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return
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fi
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# Merge all sets into temporary file
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merged="$(mktemp -q /tmp/ipset.XXXXXX)"
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CLEAN_FILES="${CLEAN_FILES} ${merged}"
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chmod 600 "${merged}"
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set +f
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if [ -d ${IPSET_DATA_DIR} ]; then
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# Copy create commands from each saved set first, then the rest:
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# list:set entries depend on other sets, so make sure they all
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# get created first
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for f in "${IPSET_DATA_DIR}"/*; do
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[ "${f}" = "${IPSET_DATA_DIR}/*" ] && break
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[ -f "${f}" ] || continue
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grep '^c' "${f}" >> "${merged}"
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done
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for f in "${IPSET_DATA_DIR}"/*; do
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[ "${f}" = "${IPSET_DATA_DIR}/*" ] && break
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[ -f "${f}" ] || continue
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grep -v '^c' "${f}" >> "${merged}"
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done
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fi
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set -f
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[ -f ${IPSET_DATA_COMPAT} ] && cat ${IPSET_DATA_COMPAT} >> "${merged}"
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# Drop sets that aren't in saved data, mark conflicts with existing sets
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conflicts=""
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IFS="
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"
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for set in $(${IPSET_BIN} list -n -t); do
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grep -q "^create ${set} " "${merged}" && conflicts="${conflicts}|${set}" && continue
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# We can't destroy the set if it's in use, flush it instead
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if ! ${IPSET_BIN} destroy "${set}" 2>/dev/null; then
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${IPSET_BIN} flush "${set}"
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fi
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done
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unset IFS
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conflicts="${conflicts#|*}"
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# Common case: if we have no conflicts, just restore in one shot
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if [ -z "${conflicts}" ]; then
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if ! ipset_restore "${merged}"; then
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err "Failed to restore configured sets"
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exit 1
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fi
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rm "${merged}"
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CLEAN_FILES="${CLEAN_FILES%* ${merged}}"
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touch ${IPSET_RUN}
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return
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fi
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# Find a salt for md5sum that makes names of saved sets unique
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salt=0
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while true; do
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unique=1
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IFS="
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"
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for set in $(${IPSET_BIN} list -n -t); do
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if grep -q "^create $(echo "${salt}${set}" | md5sum | head -c31) " "${merged}"; then
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unique=0
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break
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fi
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done
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unset IFS
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[ ${unique} -eq 1 ] && break
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salt=$((salt + 1))
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done
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# Add sets, mangling names for conflicting sets
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mangled="$(mktemp -q /tmp/ipset.XXXXXX)"
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CLEAN_FILES="${CLEAN_FILES} ${mangled}"
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chmod 600 "${mangled}"
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awk '/^(add|create) ('"${conflicts}"')/ { printf "%s ",$1; system("echo '${salt}'" $2 " | md5sum | head -c31"); $1=""; $2=""; print; next} {print}' "${merged}" > "${mangled}"
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if ! ipset_restore "${mangled}"; then
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err "Failed to restore configured sets"
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exit 1
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fi
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rm "${mangled}"
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CLEAN_FILES="${CLEAN_FILES%* ${mangled}}"
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# Swap and delete old sets
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IFS='|'
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for set in ${conflicts}; do
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mangled="$(echo "${salt}${set}" | md5sum | head -c31)"
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if ! ${IPSET_BIN} swap "${set}" "${mangled}" 2>/dev/null; then
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# This fails if set types are different: try to destroy
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# existing set
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if ! ${IPSET_BIN} destroy "${set}" 2>/dev/null; then
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# Conflicting set is in use, we can only warn
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# and flush the existing set
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err "Cannot load set \"${set}\", set with same name and conflicting type in use"
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${IPSET_BIN} flush "${set}"
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${IPSET_BIN} destroy "${mangled}"
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else
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${IPSET_BIN} rename "${mangled}" "${set}"
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fi
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else
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${IPSET_BIN} destroy "${mangled}"
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fi
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done
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unset IFS
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rm "${merged}"
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CLEAN_FILES="${CLEAN_FILES%* ${merged}}"
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touch ${IPSET_RUN}
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}
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cleanup() {
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${IPSET_BIN} flush || err "Failed to flush sets"
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# Try to destroy all sets at once. This will fail if some are in use,
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# destroy all the other ones in that case
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${IPSET_BIN} destroy 2>/dev/null && return
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IFS="
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"
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for set in $(${IPSET_BIN} list -n -t); do
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if ! ${IPSET_BIN} destroy "${set}"; then
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err "Failed to destroy set ${set}"
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fi
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done
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unset IFS
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}
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stop() {
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[ -f ${IPSET_RUN} ] || { info "Not running"; return 0; }
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[ "${IPSET_SAVE_ON_STOP}" = "yes" ] && { save || err "Failed to save sets"; }
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# Nothing to stop if the ip_set module is not loaded
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lsmod | grep -q "^ip_set " || { info "Not running"; rm ${IPSET_RUN}; return 0; }
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# If the xt_set module is in use, then iptables is using ipset, so
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# refuse to stop the service
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if mod="$(lsmod | grep ^xt_set)"; then
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if [ "$(echo "${mod}" | tr -s ' ' | cut -d' ' -f3)" != "0" ]; then
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err "Current iptables configuration requires ipset" && return 1
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fi
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fi
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cleanup
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rm ${IPSET_RUN}
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return 0
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}
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lock
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case "$1" in
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start)
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load
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;;
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stop)
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stop
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;;
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reload)
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cleanup
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load
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;;
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save)
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save
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;;
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*)
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info "Usage: $0 {start|stop|reload|save}"
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exit 1
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esac
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exit $?
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