Marc S. Weidner
051361abbb
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Signed-off-by: Marc S. Weidner <msw@coresecret.dev>
146 lines
4.4 KiB
Bash
146 lines
4.4 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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guard_sourcing || return "${ERR_GUARD_SRCE}"
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#######################################
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# Arguments check wrapper.
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# Globals:
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# None
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# Arguments:
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# 1: "$@" of ./ciss_live_builder.sh
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#######################################
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arg_check() {
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declare a
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declare sanitized_args=()
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for a in "$@"; do
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sanitized_args+=("$( sanitize_arg "${a}")")
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done
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set -- "${sanitized_args[@]}"
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}
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### Prevents accidental 'unset -f'.
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# shellcheck disable=SC2034
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readonly -f arg_check
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#######################################
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# Function to sanitize a single argument,
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# Globals:
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# LOG_ERROR
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# Arguments:
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# 1: Argument to check
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# Returns:
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# 0: on success
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# ERR_INVLD_CHAR: on failure
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#######################################
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sanitize_arg() {
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declare input="${1}"
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declare disallowed_ctrl=""
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### Step 1: Check for control characters
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if printf '%s' "${input}" | grep -qP '[[:cntrl:]]'; then
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# shellcheck disable=SC2312
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disallowed_ctrl=$(printf '%s' "${input}" | sed -n 's/[^[:cntrl:]]//gp' | sed $'s/./&\\n/g' \
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| while read -r c; do printf "%02X " "'${c}"; done)
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{
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printf "❌ Control character : '%s'. \n" "${disallowed_ctrl}"
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printf "❌ in argument : '%s'. \n" "${input}"
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printf "❌ Allowed Characters : 'a-z A-Z 0-9 . _ / = [ ] : \" - + space' \n"
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printf "\n"
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} >> "${LOG_ERROR}"
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boot_screen_cleaner
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printf "\e[91m❌ Control character : '%s'. \e[0m\n" "${disallowed_ctrl}" >&2
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printf "\e[91m❌ in argument : '%s'. \e[0m\n" "${input}" >&2
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printf "\e[91m❌ Allowed Characters : 'a-z A-Z 0-9 . _ / = [ ] : \" - + space' \e[0m\n" >&2
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# shellcheck disable=SC2162
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read -p $'\e[92m✅ Press \'ENTER\' to exit the script ... \e[0m'
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exit "${ERR_INVLD_CHAR}"
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fi
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### Step 2: Define allowed characters:
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### letters, digits, dot, underscore, slash, equals, [, ], colon, double-quote, hyphen, space.
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declare allowed='a-zA-Z0-9._/=\[\]:"\-+ '
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declare disallowed
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disallowed=$(printf '%s' "${input}" | tr -d "${allowed}")
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if [[ -n ${disallowed} ]]; then
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{
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printf "❌ Invalid character : '%s'. \n" "${disallowed//?/& }"
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printf "❌ in argument : '%s'. \n" "${input}"
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printf "❌ Allowed Characters : 'a-z A-Z 0-9 . _ / = [ ] : \" - + space' \n"
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printf "\n"
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} >> "${LOG_ERROR}"
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boot_screen_cleaner
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printf "\e[91m❌ Invalid character : '%s'. \e[0m\n" "${disallowed//?/& }" >&2
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printf "\e[91m❌ in argument : '%s'. \e[0m\n" "${input}" >&2
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printf "\e[91m❌ Allowed Characters : 'a-z A-Z 0-9 . _ / = [ ] : \" - + space' \e[0m\n" >&2
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# shellcheck disable=SC2162
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read -p $'\e[92m✅ Press \'ENTER\' to exit the script ... \e[0m'
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exit "${ERR_INVLD_CHAR}"
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else
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printf '%s' "${input}"
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fi
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return 0
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}
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### Prevents accidental 'unset -f'.
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# shellcheck disable=SC2034
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readonly -f sanitize_arg
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#######################################
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# Function to remove any character not in the allowed set.
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# Globals:
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# None
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# Arguments:
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# 1: String to Sanitize
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#######################################
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sanitize_string() {
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declare input="$1"
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### Define allowed characters:
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### letters, digits, dot, underscore, slash, equals, [, ], colon, double-quote, hyphen, space.
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declare allowed='a-zA-Z0-9._/=\[\]:"\-+ '
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printf '%s' "${input}" | tr -cd "${allowed}"
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}
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### Prevents accidental 'unset -f'.
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# shellcheck disable=SC2034
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readonly -f sanitize_string
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#######################################
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# Function to escape all shell metacharacters.
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# Globals:
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# None
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# Arguments:
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# 1: String to Sanitize
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#######################################
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sanitize_shell_literal() {
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declare input="$1"
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### %q quotes the string so that the shell re-reads it as the original literal
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printf '%q' "${input}"
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}
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### Prevents accidental 'unset -f'.
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# shellcheck disable=SC2034
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readonly -f sanitize_shell_literal
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# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh
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