Marc S. Weidner
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Signed-off-by: Marc S. Weidner <msw@coresecret.dev>
98 lines
3.1 KiB
Bash
98 lines
3.1 KiB
Bash
#!/bin/bash
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# SPDX-Version: 3.0
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# SPDX-CreationInfo: 2025-05-05; WEIDNER, Marc S.; <msw@coresecret.dev>
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# SPDX-ExternalRef: GIT https://git.coresecret.dev/msw/CISS.debian.live.builder.git
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# SPDX-FileContributor: WEIDNER, Marc S.; Centurion Intelligence Consulting Agency
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# SPDX-FileCopyrightText: 2024-2025; WEIDNER, Marc S.; <msw@coresecret.dev>
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# SPDX-FileType: SOURCE
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# SPDX-License-Identifier: EUPL-1.2 OR LicenseRef-CCLA-1.0
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# SPDX-LicenseComment: This file is part of the CISS.debian.installer.secure framework.
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# SPDX-PackageName: CISS.debian.live.builder
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# SPDX-Security-Contact: security@coresecret.eu
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#######################################
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# Wrapper for fail2ban filter checks against logs.
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# Usage: f2bchk --mode=ignored || --mode=matched || --mode=missed \
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# --filter=/etc/fail2ban/filter.d/ufw.aggressive.conf \
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# --log=/var/log/ufw.log \
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# --output=/tmp/f2bchk.log
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# Globals:
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# CGRE
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# CRED
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# CRES
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# NL
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# Arguments:
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# None
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# Returns:
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# 0: on success
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# 1: In case of any errors
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#######################################
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f2bchk(){
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### Declare default values (readonly)
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declare -r DEFAULT_MODE="matched"
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declare -r DEFAULT_FILTER="/etc/fail2ban/filter.d/ufw.aggressive.conf"
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declare -r DEFAULT_LOG="/var/log/ufw.log"
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declare mode="${DEFAULT_MODE}"
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declare filter="${DEFAULT_FILTER}"
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declare log="${DEFAULT_LOG}"
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declare output=""
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declare arg=""
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for arg in "$@"; do
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case "${arg}" in
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--mode=*) mode="${arg#--mode=}";;
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--filter=*) filter="${arg#--filter=}";;
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--log=*) log="${arg#--log=}";;
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--output=*) output="${arg#--output=}";;
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*)
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printf "%s[ERROR]%s Unknown argument: '%s' %s" "${CRED}" "${CRES}" "${arg}" "${CRED}"
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return 1
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;;
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esac
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done
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declare flag suffix
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case "${mode}" in
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ignored) flag="--print-all-ignored"; suffix="all.ignored";;
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matched) flag="--print-all-matched"; suffix="all.matched";;
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missed) flag="--print-all-missed"; suffix="all.missed";;
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*)
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printf "%s[ERROR]%s Invalid mode: '%s' %s" "${CRED}" "${CRES}" "${mode}" "${NL}"
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return 1
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;;
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esac
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if [[ -z "${output}" ]]; then
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declare filter_name="${filter##*/}"
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filter_name="${filter_name%.conf}"
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output="/tmp/${filter_name}.${suffix}.log"
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fi
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if [[ ! -r "${log}" ]]; then
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printf "%s[ERROR]%s Log file '%s' not found or not readable. %s" "${CRED}" "${CRES}" "${log}" "${NL}"
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return 1
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fi
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if [[ ! -r "${filter}" ]]; then
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printf "%s[ERROR]%s Filter file '%s' not found or not readable. %s" "${CRED}" "${CRES}" "${filter}" "${NL}"
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return 1
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fi
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printf "%s[INFO]%s Running: fail2ban-regex '%s %s %s' %s" "${CGRE}" "${CRES}" "${log}" "${filter}" "${flag}" "${NL}"
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if fail2ban-regex "${log}" "${filter}" "${flag}" >| "${output}"; then
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printf "%s[SUCCESS]%s Saved log to: '%s' %s" "${CGRE}" "${CRES}" "${output}" "${NL}"
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printf "You can view it with: cat %s%s" "${output}" "${NL}"
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else
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printf "%s[ERROR]%s fail2ban-regex execution failed. %s" "${CRED}" "${CRES}" "${NL}"
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return 1
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fi
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exit 0
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}
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# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh
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