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This compliant solution uses the Console.readPassword() method to obtain the password from the console. This method allows the password to be returned as a sequence of characters as opposed to a String object. This is advantageous as it gives the programmer more control over clearing the password from the array, immediately after use. The method also disables echoing of the password to the console.
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|---|---|---|
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class GoodPassword {
public static void main (String args[]) throws IOException {
Console c = System.console();
if (c == null) {
System.err.println("No console.");
System.exit(1);
}
String login = c.readLine("Enter your user name: ");
char [] password = c.readPassword("Enter your password: ");
if (!verify(login, password)) {
throw new IOException("Invalid Credentials");
}
// ...
Arrays.fill(password, ' ');
}
// dummy verify method, always returns true
private static final boolean verify(String login, char[] password) {
return true;
}
}
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| Wiki Markup |
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\[[API 06|AA. Java References#API 06]\] Class {{java.nio.ByteBuffer}}
\[[Tutorials 08|AA. Java References#Tutorials 08]\] [I/O from the Command Line|http://java.sun.com/docs/books/tutorial/essential/io/cl.html]
\[[Sun 06|AA. Java References#Sun 06]\] [Reading ASCII Passwords From an InputStream Example|http://java.sun.com/javase/6/docs/technotes/guides/security/crypto/CryptoSpec.html#ReadPassword] (JCA Reference Guide)
\[[MITRE 09|AA. Java References#MITRE 09]\] [CWE ID 524|http://cwe.mitre.org/data/definitions/524.html] "Information Leak Through Caching", [CWE ID 528|http://cwe.mitre.org/data/definitions/528.html] "Information Leak Through Core Dump Files", [CWE ID 215|http://cwe.mitre.org/data/definitions/215.html] "Information Leak Through Debug Information", [CWE ID 534|http://cwe.mitre.org/data/definitions/534.html] "Information Leak Through Debug Log Files", [CWE ID 526|http://cwe.mitre.org/data/definitions/526.html] "Information Leak Through Environmental Variables" and [CWE ID 226|http://cwe.mitre.org/data/definitions/226.html] "Sensitive Information Uncleared Before Release" |
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