+ (NSString*)passwordForProxy:(NSString*)proxy port:(int)port user:(NSString*)user protocol:(SecProtocolType)protocol {
	void *password;
	UInt32 passwordLength = 0;
	NSString *passwordStr = nil;

	OSStatus status = SecKeychainFindInternetPassword(NULL,
                                                      	  (int)[proxy length], [proxy UTF8String], 0, NULL,
                                                          (int)[user length], [user UTF8String], 0, NULL,
                                                          port, protocol,
                                                          kSecAuthenticationTypeAny,
                                                          &passwordLength, &password, NULL);

    	if (status == noErr) {
		if (password) {
			passwordStr = [[[NSString alloc] initWithBytes:password length:passwordLength encoding:NSUTF8StringEncoding] autorelease];
            		SecKeychainItemFreeContent(NULL, password);
		}
	}

	return passwordStr;
}