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package chloeprime.fix4log4j; | ||
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/** | ||
* @author Administrator | ||
*/ | ||
public class Censor { | ||
private static final String VIRUS_CHARACTERISTIC = "${jndi:}"; | ||
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/** | ||
* Is the given message malicious ? | ||
*/ | ||
@SuppressWarnings("AlibabaUndefineMagicConstant") | ||
public static boolean isMaliciousMessage(String message) { | ||
if (!message.contains("$")) { | ||
return false; | ||
} | ||
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int cursor = 0; | ||
for (int i = 0; i < message.length(); i++) { | ||
char c = message.charAt(i); | ||
if (c == VIRUS_CHARACTERISTIC.charAt(cursor)) { | ||
++cursor; | ||
if (cursor >= VIRUS_CHARACTERISTIC.length()) { | ||
return true; | ||
} | ||
} | ||
} | ||
return false; | ||
} | ||
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private Censor() { | ||
} | ||
} |
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censor-user-input: true |
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package chloeprime.fix4log4j; | ||
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import org.junit.jupiter.api.Test; | ||
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import static org.junit.jupiter.api.Assertions.*; | ||
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class CensorTest { | ||
@Test | ||
void censor() { | ||
String virus = "I'm Bob, ${jndi:ldap://}"; | ||
String virus2 = "${jndi:ldarg://}, Goodbye Bob~"; | ||
String virus3 = "${jndi:}"; | ||
String virus4 = "$§c{§4§Lj§kn§fd§ai§f:§7}"; | ||
String virus5 = "§c$§c{§4§Lj§kn§fd§ai§f:§7}§r"; | ||
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String innocent = "{just non dimensional interface : }"; | ||
String innocent2 = "${just non dimensional interface : "; | ||
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assertTrue(Censor.isMaliciousMessage(virus)); | ||
assertTrue(Censor.isMaliciousMessage(virus2)); | ||
assertTrue(Censor.isMaliciousMessage(virus3)); | ||
assertTrue(Censor.isMaliciousMessage(virus4)); | ||
assertTrue(Censor.isMaliciousMessage(virus5)); | ||
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assertFalse(Censor.isMaliciousMessage(innocent)); | ||
assertFalse(Censor.isMaliciousMessage(innocent2)); | ||
} | ||
} |