89 lines
2.4 KiB
Text
89 lines
2.4 KiB
Text
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#!/bin/bash
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# /usr/local/bin/dos-shell
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# 1) reset C: drive contents to only the allowed files
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# 2) launch dosemu with /cdrive mounted as C:
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set -euo pipefail
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ALLOWED_LIST="/etc/dos_allowed"
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ALLOWED_REPO="/opt/allowed_repo" # repository of allowed DOS files stored in container
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C_DRIVE="/cdrive"
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ENV_DIR="/etc/dos_env"
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AUTOEXEC_TEMPLATE="${ENV_DIR}/AUTOEXEC.BAT"
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CONFIG_TEMPLATE="${ENV_DIR}/CONFIG.SYS"
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if [ "$(id -u)" -eq 0 ] && [ ! -d "${ENV_DIR}" ]; then
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mkdir -p "${ENV_DIR}"
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fi
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# clear C: drive to ensure only allowed programs are present
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rm -rf "${C_DRIVE:?}/"*
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mkdir -p "${C_DRIVE}"
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# Collect the list of allowed files and sync them into the C: drive
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allowed_entries=()
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if [ -f "${ALLOWED_LIST}" ]; then
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while IFS= read -r line || [ -n "$line" ]; do
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# trim whitespace
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line="$(printf '%s' "$line" | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//')"
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# skip blank/comment lines
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case "$line" in
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''|\#*) continue ;;
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esac
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allowed_entries+=("$line")
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done < "${ALLOWED_LIST}"
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fi
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# Copy allowed files into the DOS C: drive
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for entry in "${allowed_entries[@]}"; do
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src="${ALLOWED_REPO}/${entry}"
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if [ -e "$src" ]; then
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dst_dir="$(dirname "${entry}")"
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mkdir -p "${C_DRIVE}/${dst_dir}"
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cp -a "$src" "${C_DRIVE}/${dst_dir}/"
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else
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echo "Warning: allowed file not found: $src" >&2
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fi
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done
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# Optional: create an AUTOEXEC.BAT and CONFIG.SYS or other DOS boot files
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autoexec_path="${C_DRIVE}/AUTOEXEC.BAT"
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config_path="${C_DRIVE}/CONFIG.SYS"
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if [ -f "${AUTOEXEC_TEMPLATE}" ]; then
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cp "${AUTOEXEC_TEMPLATE}" "${autoexec_path}"
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else
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cat > "${autoexec_path}" <<'EOF'
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@echo off
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prompt [DOS]$P$G
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echo Welcome to the containerized DOS environment.
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EOF
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fi
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if [ ${#allowed_entries[@]} -gt 0 ]; then
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{
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printf 'echo Allowed programs:\r\n'
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for entry in "${allowed_entries[@]}"; do
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dos_entry="${entry//\//\\}"
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printf 'echo %s\r\n' "${dos_entry}"
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done
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} >> "${autoexec_path}"
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else
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{
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printf 'echo No extra programs are currently enabled.\r\n'
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} >> "${autoexec_path}"
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fi
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if [ -f "${CONFIG_TEMPLATE}" ]; then
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cp "${CONFIG_TEMPLATE}" "${config_path}"
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fi
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# Drop privileges to dosuser if we were run as root (ssh will run as the user)
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# but in case sshd runs ForceCommand as root, we switch.
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if [ "$(id -u)" -eq 0 ]; then
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exec runuser -u dosuser -- dosemu -quiet -K "${C_DRIVE}"
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else
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# running as the user already
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exec dosemu -quiet -K "${C_DRIVE}"
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fi
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