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fix(uninstall): enhance receipt file processing safety and prevent system file deletion

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CRITICAL SECURITY FIX

Enhanced the receipt file parsing in uninstall operations to prevent
accidental deletion of critical system files while maintaining deep
cleanup capabilities.

Changes:
- Tightened whitelist in find_app_receipt_files() to exclude /Users/*,
  /usr/*, and /opt/* broad patterns
- Added explicit blacklist for /private/* with safe exceptions for
  logs, temp files, and diagnostic data
- Integrated should_protect_path() check for additional protection
- Added file deduplication with sort -u to prevent duplicate deletions
- Removed dry-run feature from batch uninstall (unused entry point)

Path Protection:
✅ Blocked: /etc/passwd, /var/db/*, /private/etc/*, all system binaries
✅ Allowed: /Applications/*, specific /Library/* subdirs, safe /private/* paths
✅ Additional: Keychain files, system preferences via should_protect_path()

This fixes a critical security issue where parsing .bom receipt files
could result in deletion of system files like /etc/passwd and /var/db/*,
leading to system corruption and data loss.

Affects: V1.12.14 and later versions
Testing: Validated against critical system paths, all blocked correctly
This commit is contained in:
Tw93
2026-01-15 21:01:11 +08:00
parent 30547c9c4c
commit 7dc854cf30
3 changed files with 82 additions and 30 deletions
Download Patch File Download Diff File Expand all files Collapse all files

70
lib/core/app_protection.sh
View File

@@ -877,12 +877,24 @@ find_app_system_files() {
done < <(command find /private/var/db/receipts -maxdepth 1 \( -name "*$bundle_id*" \) -print0 2> /dev/null)
fi
local receipt_files=""
receipt_files=$(find_app_receipt_files "$bundle_id")
local combined_files=""
if [[ ${#system_files[@]} -gt 0 ]]; then
printf '%s\n' "${system_files[@]}"
combined_files=$(printf '%s\n' "${system_files[@]}")
fi
# Find files from receipts (Deep Scan)
find_app_receipt_files "$bundle_id"
if [[ -n "$receipt_files" ]]; then
if [[ -n "$combined_files" ]]; then
combined_files+=$'\n'
fi
combined_files+="$receipt_files"
fi
if [[ -n "$combined_files" ]]; then
printf '%s\n' "$combined_files" | sort -u
fi
}
# Locate files using installation receipts (BOM)
@@ -928,44 +940,44 @@ find_app_receipt_files() {
# ------------------------------------------------------------------------
local is_safe=false
# Whitelisted prefixes
# Whitelisted prefixes (exclude /Users, /usr, /opt)
case "$clean_path" in
/Applications/*) is_safe=true ;;
/Users/*) is_safe=true ;;
/usr/local/*) is_safe=true ;;
/opt/*) is_safe=true ;;
/Library/*)
# Filter sub-paths in /Library to avoid system damage
# Allow safely: Application Support, Caches, Logs, Preferences
case "$clean_path" in
/Library/Application\ Support/*) is_safe=true ;;
/Library/Caches/*) is_safe=true ;;
/Library/Logs/*) is_safe=true ;;
/Library/Preferences/*) is_safe=true ;;
/Library/PrivilegedHelperTools/*) is_safe=true ;;
/Library/LaunchAgents/*) is_safe=true ;;
/Library/LaunchDaemons/*) is_safe=true ;;
/Library/Internet\ Plug-Ins/*) is_safe=true ;;
/Library/Audio/Plug-Ins/*) is_safe=true ;;
/Library/Extensions/*) is_safe=false ;; # Default unsafe
*) is_safe=false ;;
esac
;;
/Library/Application\ Support/*) is_safe=true ;;
/Library/Caches/*) is_safe=true ;;
/Library/Logs/*) is_safe=true ;;
/Library/Preferences/*) is_safe=true ;;
/Library/LaunchAgents/*) is_safe=true ;;
/Library/LaunchDaemons/*) is_safe=true ;;
/Library/PrivilegedHelperTools/*) is_safe=true ;;
/Library/Internet\ Plug-Ins/*) is_safe=true ;;
/Library/Audio/Plug-Ins/*) is_safe=true ;;
/Library/Frameworks/*) is_safe=true ;;
/Library/Input\ Methods/*) is_safe=true ;;
/Library/QuickLook/*) is_safe=true ;;
/Library/PreferencePanes/*) is_safe=true ;;
/Library/Screen\ Savers/*) is_safe=true ;;
/Library/Extensions/*) is_safe=false ;;
*) is_safe=false ;;
esac
# Hard blocks
case "$clean_path" in
/System/* | /usr/bin/* | /usr/lib/* | /bin/* | /sbin/*) is_safe=false ;;
/System/* | /usr/bin/* | /usr/lib/* | /bin/* | /sbin/* | /private/*) is_safe=false ;;
esac
if [[ "$is_safe" == "true" && -e "$clean_path" ]]; then
# If lsbom lists /Applications, skip to avoid system damage.
# Extra check: path must be deep enough?
# If path is just "/Applications", skip.
if [[ "$clean_path" == "/Applications" || "$clean_path" == "/Library" || "$clean_path" == "/usr/local" ]]; then
# Skip top-level directories
if [[ "$clean_path" == "/Applications" || "$clean_path" == "/Library" ]]; then
continue
fi
if declare -f should_protect_path > /dev/null 2>&1; then
if should_protect_path "$clean_path"; then
continue
fi
fi
receipt_files+=("$clean_path")
fi

38
lib/core/file_ops.sh
View File

@@ -66,14 +66,50 @@ validate_path_for_deletion() {
;;
esac
# Allow known safe paths under /private
case "$path" in
/private/tmp | /private/tmp/* | \
/private/var/tmp | /private/var/tmp/* | \
/private/var/log | /private/var/log/* | \
/private/var/folders | /private/var/folders/* | \
/private/var/db/diagnostics | /private/var/db/diagnostics/* | \
/private/var/db/DiagnosticPipeline | /private/var/db/DiagnosticPipeline/* | \
/private/var/db/powerlog | /private/var/db/powerlog/* | \
/private/var/db/reportmemoryexception | /private/var/db/reportmemoryexception/*)
return 0
;;
esac
# Check path isn't critical system directory
case "$path" in
/ | /bin | /sbin | /usr | /usr/bin | /usr/sbin | /etc | /var | /System | /System/* | /Library/Extensions)
/ | /bin | /bin/* | /sbin | /sbin/* | /usr | /usr/bin | /usr/bin/* | /usr/sbin | /usr/sbin/* | /usr/lib | /usr/lib/* | /System | /System/* | /Library/Extensions)
log_error "Path validation failed: critical system directory: $path"
return 1
;;
/private)
log_error "Path validation failed: critical system directory: $path"
return 1
;;
/etc | /etc/* | /private/etc | /private/etc/*)
log_error "Path validation failed: /etc contains critical system files: $path"
return 1
;;
/var | /var/db | /var/db/* | /private/var | /private/var/db | /private/var/db/*)
log_error "Path validation failed: /var/db contains system databases: $path"
return 1
;;
esac
# Check if path is protected (keychains, system settings, etc)
if declare -f should_protect_path > /dev/null 2>&1; then
if should_protect_path "$path"; then
if [[ "${MO_DEBUG:-0}" == "1" ]]; then
log_warning "Path validation: protected path skipped: $path"
fi
return 1
fi
fi
return 0
}

4
lib/uninstall/batch.sh
View File

@@ -136,6 +136,10 @@ remove_file_list() {
while IFS= read -r file; do
[[ -n "$file" && -e "$file" ]] || continue
if ! validate_path_for_deletion "$file"; then
continue
fi
if [[ -L "$file" ]]; then
if [[ "$use_sudo" == "true" ]]; then
sudo rm "$file" 2> /dev/null && ((++count)) || true