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Fix Predictable pseudorandom number generator security issue

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This commit is contained in:
warunalakshitha 2017-01-17 16:07:02 +05:30
parent 8353954b16
commit 5dbcbbe43a
2 changed files with 28 additions and 25 deletions
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39
src/main/java/org/wso2/carbon/device/mgt/iot/virtualfirealarm/agent/transport/TransportUtils.java
View File

@ -36,6 +36,8 @@ import java.net.ServerSocket;
import java.net.SocketException;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashMap;
@ -173,27 +175,26 @@ public class TransportUtils {
*/
public static synchronized int getAvailablePort(int randomAttempts) {
ArrayList<Integer> failedPorts = new ArrayList<Integer>(randomAttempts);
Random randomNum = new Random();
int randomPort = MAX_PORT_NUMBER;
while (randomAttempts > 0) {
randomPort = randomNum.nextInt(MAX_PORT_NUMBER - MIN_PORT_NUMBER) + MIN_PORT_NUMBER;
if (checkIfPortAvailable(randomPort)) {
return randomPort;
try {
SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
int randomPort = MAX_PORT_NUMBER;
while (randomAttempts > 0) {
randomPort = secureRandom.nextInt(MAX_PORT_NUMBER - MIN_PORT_NUMBER) + MIN_PORT_NUMBER;
if (checkIfPortAvailable(randomPort)) {
return randomPort;
}
failedPorts.add(randomPort);
randomAttempts--;
}
failedPorts.add(randomPort);
randomAttempts--;
}
randomPort = MAX_PORT_NUMBER;
while (true) {
if (!failedPorts.contains(randomPort) && checkIfPortAvailable(randomPort)) {
return randomPort;
randomPort = MAX_PORT_NUMBER;
while (true) {
if (!failedPorts.contains(randomPort) && checkIfPortAvailable(randomPort)) {
return randomPort;
}
randomPort--;
}
randomPort--;
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException("SHA1PRNG algorithm could not be found.");
}
}

14
src/main/java/org/wso2/carbon/device/mgt/iot/virtualfirealarm/agent/virtual/VirtualHardwareManager.java
View File

@ -33,6 +33,8 @@ import javax.sound.sampled.Clip;
import javax.swing.*;
import java.io.IOException;
import java.io.InputStream;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
/**
* This class use to emulate virtual hardware functionality
@ -174,19 +176,19 @@ public class VirtualHardwareManager {
}
private int getRandom(int max, int min, int current, boolean isSmoothed, int svf) {
if (isSmoothed) {
int offset = (max - min) * svf / 100;
double mx = current + offset;
max = (mx > max) ? max : (int) Math.round(mx);
double mn = current - offset;
min = (mn < min) ? min : (int) Math.round(mn);
}
double rnd = Math.random() * (max - min) + min;
return (int) Math.round(rnd);
try {
SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
return secureRandom.nextInt(max - min) + min;
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException("SHA1PRNG algorithm could not be found.");
}
}
private void setAudioSequencer() {