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Generate secure log entry generation code. Enforces secure generation of code generating a log entry. Invoke when writing any log entry generation related code.
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SOC 職業分類に基づく
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| name | secure-log-entry-generation |
| description | Generate secure log entry generation code. Enforces secure generation of code generating a log entry. Invoke when writing any log entry generation related code. |
| allowed-tools | Read Grep Glob |
| metadata | {"category":"security"} |
Apply all rules below when generating or reviewing any code related to generation of a log entry.
\r, \n, \u2028 (Unicode LINE SEPARATOR) or \u2029 (Unicode PARAGRAPH SEPARATOR) character in the value is removed.// BAD: No validation is applied
void handleRequest(HttpServletRequest request) {
String userControlledContent = request.getParameter("input");
Logger logger = Logger.getLogger(Main.class.getName());
logger.info(userControlledContent);
}
// GOOD: All points are applied
public class LogHelper {
private static final int MAX_USER_INPUT_LENGTH = 100;
private static String sanitize(String value) {
if (value == null) return "null";
// Rule 1: HTML-encode special characters (prevent markup injection)
value = value.replace("&", "&")
.replace("<", "<")
.replace(">", ">")
.replace("\"", """)
.replace("'", "'");
// Rule 2: Remove line-break characters (prevent log forging)
value = value.replace("\r", "")
.replace("\n", "")
.replace("\u2028", "") // Unicode LINE SEPARATOR
.replace("\u2029", ""); // Unicode PARAGRAPH SEPARATOR
// Rule 3: Remove ANSI escape sequences (prevent terminal escape injection)
value = value.replaceAll("\u001B\\[[\\d;]*[a-zA-Z]", "") // strip CSI sequences
.replace("\u001B", ""); // strip bare ESC
// Rule 4: Truncate to maximum allowed length (prevent log flooding)
if (value.length() > MAX_USER_INPUT_LENGTH) {
value = value.substring(0, MAX_USER_INPUT_LENGTH) + "[TRUNCATED]";
}
return value;
}
public static void logUserInput(String userControlledContent) {
Logger logger = Logger.getLogger(LogHelper.class.getName());
logger.info(sanitize(userControlledContent));
}
}
Before finalizing generated code, verify:
\r, \n, \u2028 or \u2029 character is removed.