|
public BenignLoginAttempt ( System.DateTime eventTimeUtc ) : |
||
| eventTimeUtc | System.DateTime | |
| return | ||
public SimulatedLoginAttempt BenignLoginAttempt(DateTime eventTimeUtc)
{
// If there is a benign login attempt already scheduled to occur by now,
// send it instaed
lock (ScheduledBenignAttempts)
{
if (ScheduledBenignAttempts.Count > 0 &&
ScheduledBenignAttempts.First().TimeOfAttemptUtc < eventTimeUtc)
{
SimulatedLoginAttempt result = ScheduledBenignAttempts.First();
ScheduledBenignAttempts.Remove(result);
return result;
}
}
string mistake = "";
//1. Pick a user at random
SimulatedUserAccount account = _simAccounts.BenignAccountSelector.GetItemByWeightedRandom();
//2. Deal with cookies
string cookie;
// Add a new cookie if there are no cookies, or with if we haven't reached the max number of cookies and lose a roll of the dice
if (account.Cookies.Count == 0 ||
(account.Cookies.Count < _experimentalConfiguration.MaxCookiesPerUserAccount && StrongRandomNumberGenerator.GetFraction() > _experimentalConfiguration.ChanceOfCoookieReUse))
{
// We'll use the decimal represenation of a 64-bit unsigned integer as our cookie
cookie = StrongRandomNumberGenerator.Get64Bits().ToString();
account.Cookies.Add(cookie);
}
else
{
// Use one of the user's existing cookies selected at random
cookie = account.Cookies.ToArray()[(int)StrongRandomNumberGenerator.Get32Bits(account.Cookies.Count)];
}
//Console.WriteLine("The user currently has " + account.Cookies.Count + " cookies. Using: " + cookie);
//3. Choose an IP address for the login
// 1/3 of times login with the primary IP address, otherwise, choose an IP randomly from the benign IP pool
IPAddress clientIp;
if (account.ClientAddresses.Count == 0 ||
(account.ClientAddresses.Count < _experimentalConfiguration.MaxIpPerUserAccount && StrongRandomNumberGenerator.GetFraction() < _experimentalConfiguration.ChanceOfIpReUse))
{
// Use a new IP for the user
account.ClientAddresses.Add(clientIp = _ipPool.GetNewRandomBenignIp());
}
else
{
// Use one of the user's existing IP Addresses selected at random
clientIp = account.ClientAddresses.ToArray()[(int)StrongRandomNumberGenerator.Get32Bits(account.ClientAddresses.Count)];
}
string password = account.Password;
//
// Add benign failures
// An automated client begins a string of login attempts using an old (stale) password
if (StrongRandomNumberGenerator.GetFraction() < _experimentalConfiguration.ChanceOfLongRepeatOfStalePassword)
{
// To cause this client to be out of date, we'll change the password here.
string newPassword = _simPasswords.GetPasswordFromWeightedDistribution();
_userAccountController.SetPassword(account, newPassword, account.Password);
mistake += "StalePassword";
// Schedule all the future failed attempts a fixed distance aparat
lock (ScheduledBenignAttempts)
{
double additionalMistakes = 0;
DateTime currentTimeUtc = eventTimeUtc;
for (additionalMistakes = 1; additionalMistakes < _experimentalConfiguration.LengthOfLongRepeatOfOldPassword; additionalMistakes++)
{
currentTimeUtc = currentTimeUtc.AddSeconds(_experimentalConfiguration.MinutesBetweenLongRepeatOfOldPassword);
ScheduledBenignAttempts.Add(new SimulatedLoginAttempt(
account, password, false, false, clientIp, cookie, mistake, currentTimeUtc));
}
for (uint correctLogins = 1; correctLogins < _experimentalConfiguration.LengthOfLongRepeatOfOldPassword; correctLogins++)
{
currentTimeUtc = currentTimeUtc.AddSeconds(_experimentalConfiguration.MinutesBetweenLongRepeatOfOldPassword);
ScheduledBenignAttempts.Add(new SimulatedLoginAttempt(
account, newPassword, false, false, clientIp, cookie, mistake,currentTimeUtc));
}
}
}
// The benign user may mistype her password causing a typo
if (StrongRandomNumberGenerator.GetFraction() < _experimentalConfiguration.ChanceOfBenignPasswordTypo)
{
mistake += "Typo";
// Typos tend to come in clusters, and are hopefully followed by a correct login
// Add additional typos to the schedule of future benign attempts and then a submission of the correct password
lock (ScheduledBenignAttempts)
{
double additionalMistakes = 0;
while (StrongRandomNumberGenerator.GetFraction() < _experimentalConfiguration.ChanceOfRepeatTypo)
{
ScheduledBenignAttempts.Add(new SimulatedLoginAttempt(
account, AddTypoToPassword(password), false, false, clientIp, cookie, mistake,
eventTimeUtc.AddSeconds(_experimentalConfiguration.DelayBetweenRepeatBenignErrorsInSeconds * ++additionalMistakes)));
}
// Add a correct login after the string of typos
ScheduledBenignAttempts.Add(new SimulatedLoginAttempt(
account, password, false, false, clientIp, cookie, "", eventTimeUtc.AddSeconds(
_experimentalConfiguration.DelayBetweenRepeatBenignErrorsInSeconds*(1 + additionalMistakes))));
}
// Put the typo into the password for the first typo failure, to be returned by this function.
password = AddTypoToPassword(password);
}
// The benign user may mistakenly use a password for another of her accounts, which we draw from same distribution
// we used to generate user account passwords
if (StrongRandomNumberGenerator.GetFraction() < _experimentalConfiguration.ChanceOfAccidentallyUsingAnotherAccountPassword)
{
mistake += "WrongPassword";
// Choices of the wrong account password may come in clusters, and are hopefully followed by a correct login
// Add additional typos to the schedule of future benign attempts and then a submission of the correct password
lock (ScheduledBenignAttempts)
{
double additionalMistakes = 0;
while(StrongRandomNumberGenerator.GetFraction() < _experimentalConfiguration.ChanceOfRepeatUseOfPasswordFromAnotherAccount) {
ScheduledBenignAttempts.Add(new SimulatedLoginAttempt(
account, _simPasswords.GetPasswordFromWeightedDistribution(), false, false, clientIp, cookie,
mistake, eventTimeUtc.AddSeconds(_experimentalConfiguration.DelayBetweenRepeatBenignErrorsInSeconds*++additionalMistakes)));
}
// Add a correct login after mistakes
ScheduledBenignAttempts.Add(new SimulatedLoginAttempt(
account, password, false, false, clientIp, cookie, "", eventTimeUtc.AddSeconds(
_experimentalConfiguration.DelayBetweenRepeatBenignErrorsInSeconds * (additionalMistakes+1))));
}
// Make the current request have the wrong password
password = _simPasswords.GetPasswordFromWeightedDistribution();
}
// The benign user may mistype her account name, and land on someone else's account name
if (StrongRandomNumberGenerator.GetFraction() < _experimentalConfiguration.ChanceOfBenignAccountNameTypoResultingInAValidUserName)
{
mistake += "WrongAccountName";
// Choices of the wrong account password may come in clusters, and are hopefully followed by a correct login
// Add additional typos to the schedule of future benign attempts and then a submission of the correct password
lock (ScheduledBenignAttempts)
{
double additionalMistakes = 0;
while (StrongRandomNumberGenerator.GetFraction() < _experimentalConfiguration.ChanceOfRepeatWrongAccountName)
{
ScheduledBenignAttempts.Add(new SimulatedLoginAttempt(
_simAccounts.GetBenignAccountAtRandomUniform(), password, false, false, clientIp, cookie, mistake, eventTimeUtc.AddSeconds(
_experimentalConfiguration.DelayBetweenRepeatBenignErrorsInSeconds * ++additionalMistakes)));
}
// Add a correct login after mistakes
ScheduledBenignAttempts.Add(new SimulatedLoginAttempt(
account, password, false, false, clientIp, cookie, "", eventTimeUtc.AddSeconds(
_experimentalConfiguration.DelayBetweenRepeatBenignErrorsInSeconds * (additionalMistakes + 1))));
// Make the current request have the wrong account name
account = _simAccounts.GetBenignAccountAtRandomUniform();
}
}
return new SimulatedLoginAttempt(account, password, false, false, clientIp, cookie, mistake, eventTimeUtc);
}
/// <summary>
/// Evaluate the accuracy of our stopguessing service by sending user logins and malicious traffic
/// </summary>
/// <returns></returns>
public void Run()
{
_logger.WriteStatus("In RunInBackground");
_logger.WriteStatus("Priming password-tracking with known common passwords");
_simPasswords.PrimeWithKnownPasswordsAsync(_binomialLadderFilter, 40);
_logger.WriteStatus("Finished priming password-tracking with known common passwords");
_logger.WriteStatus("Creating IP Pool");
_ipPool = new IpPool(_experimentalConfiguration);
_logger.WriteStatus("Generating simualted account records");
_simAccounts = new SimulatedAccounts(_ipPool, _simPasswords, _logger);
_simAccounts.Generate(_experimentalConfiguration);
_logger.WriteStatus("Creating login-attempt generator");
_attemptGenerator = new SimulatedLoginAttemptGenerator(_experimentalConfiguration, _simAccounts, _ipPool,
_simPasswords);
_logger.WriteStatus("Finiished creating login-attempt generator");
foreach (
ConcurrentStreamWriter writer in
new[]
{_AttackAttemptsWithValidPasswords, _LegitimateAttemptsWithValidPasswords, _OtherAttempts})
{
lock (writer)
{
writer.WriteLine(string.Format("{0}\t{1}\t{2}\t{3}\t{4}\t{5}\t{6}\t{7}\t{8}\t{9}\t{10}" +
"\t{11}\t{12}\t{13}\t{14}\t{15}\t{16}\t{17}\t{18}\t{19}\t{20}\t{21}\t{22}\t{23}\t{24}\t{25}",
"Password",
"UserID",
"IP",
"DeviceCookie",
"IsFrequentlyGuessedPw",
"IsPasswordCorrect",
"IsFromAttackAttacker",
"IsAGuess",
"IPInOposingPool",
"IsClientAProxyIP",
"TypeOfMistake",
"DecayedInvalidAttemptsPerPassword",
"DecayedMaxConsecutiveIncorrectAttemptsPerAccount",
"DecayedSuccessfulLogins",
"DecayedAccountFailuresInfrequentPassword",
"DecayedAccountFailuresFrequentPassword",
"DecayedRepeatAccountFailuresInfrequentPassword",
"DecayedRepeatAccountFailuresFrequentPassword",
"DecayedPasswordFailuresNoTypoInfrequentPassword",
"DecayedPasswordFailuresNoTypoFrequentPassword",
"DecayedPasswordFailuresTypoInfrequentPassword",
"DecayedPasswordFailuresTypoFrequentPassword",
"DecayedRepeatPasswordFailuresNoTypoInfrequentPassword",
"DecayedRepeatPasswordFailuresNoTypoFrequentPassword",
"DecayedRepeatPasswordFailuresTypoInfrequentPassword",
"DecayedRepeatPasswordFailuresTypoFrequentPassword"
));
}
}
TimeSpan testTimeSpan = _experimentalConfiguration.TestTimeSpan;
double ticksBetweenLogins = ((double) testTimeSpan.Ticks)/
(double) _experimentalConfiguration.TotalLoginAttemptsToIssue;
int interlockedCount = 0;
Parallel.For(0L, (long) _experimentalConfiguration.TotalLoginAttemptsToIssue, (count, pls) =>
//) TaskParalllel.RepeatWithWorkers(_experimentalConfiguration.TotalLoginAttemptsToIssue,
//async (count, cancelToken) =>
// (count) =>
{
interlockedCount = Interlocked.Add(ref interlockedCount, 1);
if (interlockedCount % 10000 == 0)
_logger.WriteStatus("Login Attempt {0:N0}", interlockedCount);
DateTime eventTimeUtc = StartTimeUtc.AddTicks((long) (ticksBetweenLogins* interlockedCount));
SimulatedLoginAttempt simAttempt;
if (StrongRandomNumberGenerator.GetFraction() <
_experimentalConfiguration.FractionOfLoginAttemptsFromAttacker)
{
switch (_experimentalConfiguration.AttackersStrategy)
{
case ExperimentalConfiguration.AttackStrategy.UseUntilLikelyPopular:
simAttempt =
_attemptGenerator.MaliciousLoginAttemptBreadthFirstAvoidMakingPopular(eventTimeUtc);
break;
case ExperimentalConfiguration.AttackStrategy.Weighted:
simAttempt = _attemptGenerator.MaliciousLoginAttemptWeighted(eventTimeUtc);
break;
case ExperimentalConfiguration.AttackStrategy.BreadthFirst:
default:
simAttempt = _attemptGenerator.MaliciousLoginAttemptBreadthFirst(eventTimeUtc);
break;
}
}
else
{
simAttempt = _attemptGenerator.BenignLoginAttempt(eventTimeUtc);
}
// Get information about the client's IP
SimIpHistory ipHistory = _ipHistoryCache.GetOrAdd(simAttempt.AddressOfClientInitiatingRequest,
(ip) => new SimIpHistory(
_experimentalConfiguration.BlockingOptions
.NumberOfFailuresToTrackForGoingBackInTimeToIdentifyTypos) );
//SimIpHistory ipHistory = await _ipHistoryCache.GetAsync(simAttempt.AddressOfClientInitiatingRequest, cancelToken);
double[] scores = ipHistory.GetAllScores(_experimentalConfiguration.BlockingOptions.BlockScoreHalfLife,
simAttempt.TimeOfAttemptUtc);
simAttempt.UpdateSimulatorState(this, ipHistory);
double decayingInvalidPasswordAttempts = 0d;
if (simAttempt.IsPasswordValid)
{
DecayingDouble incorrectPasswordAttempts;
if (_incorrectPasswordCounts.TryGetValue(simAttempt.Password, out incorrectPasswordAttempts))
decayingInvalidPasswordAttempts = incorrectPasswordAttempts.GetValue(_experimentalConfiguration.BlockingOptions.BlockScoreHalfLife, simAttempt.TimeOfAttemptUtc);
} else
{
decayingInvalidPasswordAttempts = 1d;
DecayingDouble incorrectPasswordAttempts;
if (_incorrectPasswordCounts.TryGetValue(simAttempt.Password, out incorrectPasswordAttempts))
decayingInvalidPasswordAttempts += incorrectPasswordAttempts.GetValue(_experimentalConfiguration.BlockingOptions.BlockScoreHalfLife, simAttempt.TimeOfAttemptUtc);
_incorrectPasswordCounts[simAttempt.Password] = new DecayingDouble(decayingInvalidPasswordAttempts, simAttempt.TimeOfAttemptUtc);
}
var ipInfo = _ipPool.GetIpAddressDebugInfo(simAttempt.AddressOfClientInitiatingRequest);
string outputString = string.Format("{0}\t{1}\t{2}\t{3}\t{4}\t{5}\t{6}\t{7}\t{8}\t{9}\t{10}\t{11}\t{12}\t{13}",
simAttempt.Password,
simAttempt.SimAccount?.UsernameOrAccountId ?? "<null>",
simAttempt.AddressOfClientInitiatingRequest,
simAttempt.DeviceCookieHadPriorSuccessfulLoginForThisAccount ? "HadCookie" : "NoCookie",
simAttempt.IsFrequentlyGuessedPassword ? "Frequent" : "Infrequent",
simAttempt.IsPasswordValid ? "Correct" : "Incorrect",
simAttempt.IsFromAttacker ? "FromAttacker" : "FromUser",
simAttempt.IsGuess ? "IsGuess" : "NotGuess",
simAttempt.IsFromAttacker
? (ipInfo.UsedByBenignUsers ? "IsInBenignPool" : "NotUsedByBenign")
: (ipInfo.UsedByAttackers ? "IsInAttackersIpPool" : "NotUsedByAttacker"),
ipInfo.IsPartOfProxy ? "ProxyIP" : "NotAProxy",
string.IsNullOrEmpty(simAttempt.MistakeType) ? "-" : simAttempt.MistakeType,
decayingInvalidPasswordAttempts,
simAttempt.SimAccount?.MaxConsecutiveIncorrectAttempts.GetValue(_experimentalConfiguration.BlockingOptions.BlockScoreHalfLife, simAttempt.TimeOfAttemptUtc) ?? 0d,
string.Join("\t", scores.Select(s => s.ToString(CultureInfo.InvariantCulture)).ToArray())
);
if (simAttempt.IsFromAttacker && simAttempt.IsPasswordValid)
{
lock (_AttackAttemptsWithValidPasswords)
{
_AttackAttemptsWithValidPasswords.WriteLine(outputString);
//_AttackAttemptsWithValidPasswords.Flush();
}
}
else if (!simAttempt.IsFromAttacker && simAttempt.IsPasswordValid)
{
lock (_LegitimateAttemptsWithValidPasswords)
{
_LegitimateAttemptsWithValidPasswords.WriteLine(outputString);
//_LegitiamteAttemptsWithValidPasswords.Flush();
}
}
else
{
lock (_OtherAttempts)
{
_OtherAttempts.WriteLine(outputString);
//_OtherAttempts.Flush();
}
}
});
//(e) => {
//},
//cancellationToken: cancellationToken).ConfigureAwait(false);
foreach (
ConcurrentStreamWriter writer in
new []
{_AttackAttemptsWithValidPasswords, _LegitimateAttemptsWithValidPasswords, _OtherAttempts})
{
writer.Close();
}
//_memoryUsageLimiter.Dispose();
}
