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Sanitize and validate user input before file write in actions.py #16

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Merged
studentsca023-rgb merged 1 commit into from
Mar 17, 2026
Merged

Sanitize and validate user input before file write in actions.py #16

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12 changes: 11 additions & 1 deletion flask_webgoat/actions.py
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,16 @@ def log_entry():
if text_param is None:
return jsonify({"error": "text parameter is required"})

# Limit text size to prevent disk space exhaustion (max 10KB)
MAX_TEXT_SIZE = 10 * 1024
if len(text_param) > MAX_TEXT_SIZE:
return jsonify({"error": f"text exceeds maximum allowed size of {MAX_TEXT_SIZE} bytes"})

# Sanitize text: only allow printable ASCII and common whitespace
sanitized_text = "".join(
c for c in text_param if c.isprintable() or c in "\n\r\t"
)

user_id = user_info[0]
user_dir = "data/" + str(user_id)
user_dir_path = Path(user_dir)
Expand All @@ -33,7 +43,7 @@ def log_entry():
filename = secure_filename(filename_param) + ".txt"
path = Path(user_dir) / filename
with path.open("w", encoding="utf-8") as open_file:
open_file.write(text_param)
open_file.write(sanitized_text)
return jsonify({"success": True})


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