public Response Execute(NancyContext context, IResponseFormatter response)
{
if (!configurationStore.GetIsEnabled())
{
return(responseCreator.AsStatusCode(HttpStatusCode.BadRequest));
}
var model = modelBinder.Bind <LoginCommand>(context);
var attemptedUsername = model.Username;
var requestUserHostAddress = context.Request.UserHostAddress;
var action = loginTracker.BeforeAttempt(attemptedUsername, requestUserHostAddress);
if (action == InvalidLoginAction.Ban)
{
return(responseCreator.BadRequest("You have had too many failed login attempts in a short period of time. Please try again later."));
}
var userResult = credentialValidator.ValidateCredentials(attemptedUsername, model.Password);
if (!userResult.Succeeded)
{
loginTracker.RecordFailure(attemptedUsername, requestUserHostAddress);
if (action == InvalidLoginAction.Slow)
{
sleep.For(1000);
}
return(responseCreator.BadRequest(userResult.FailureReason));
}
var user = userResult.User;
if (user == null || !user.IsActive || user.IsService)
{
loginTracker.RecordFailure(attemptedUsername, requestUserHostAddress);
if (action == InvalidLoginAction.Slow)
{
sleep.For(1000);
}
return(responseCreator.BadRequest("Invalid username or password."));
}
loginTracker.RecordSucess(attemptedUsername, requestUserHostAddress);
var cookie = issuer.CreateAuthCookie(context, user.IdentificationToken, model.RememberMe);
return(responseCreator.AsOctopusJson(response, userMapper.MapToResource(user))
.WithCookie(cookie)
.WithStatusCode(HttpStatusCode.OK)
.WithHeader("Expires", DateTime.UtcNow.AddYears(1).ToString("R", DateTimeFormatInfo.InvariantInfo)));
}
public async Task <Response> ExecuteAsync(NancyContext context, IResponseFormatter response)
{
// Step 1: Try and get all of the details from the request making sure there are no errors passed back from the external identity provider
string stateFromRequest;
var principalContainer = await authTokenHandler.GetPrincipalAsync(context.Request, out stateFromRequest);
var principal = principalContainer.principal;
if (principal == null || !string.IsNullOrEmpty(principalContainer.error))
{
return(BadRequest($"The response from the external identity provider contained an error: {principalContainer.error}"));
}
// Step 2: Validate the state object we passed wasn't tampered with
const string stateDescription = "As a security precaution, Octopus ensures the state object returned from the external identity provider matches what it expected.";
var expectedStateHash = string.Empty;
if (context.Request.Cookies.ContainsKey("s"))
{
expectedStateHash = HttpUtility.UrlDecode(context.Request.Cookies["s"]);
}
if (string.IsNullOrWhiteSpace(expectedStateHash))
{
return(BadRequest($"User login failed: Missing State Hash Cookie. {stateDescription} In this case the Cookie containing the SHA256 hash of the state object is missing from the request."));
}
var stateFromRequestHash = State.Protect(stateFromRequest);
if (stateFromRequestHash != expectedStateHash)
{
return(BadRequest($"User login failed: Tampered State. {stateDescription} In this case the state object looks like it has been tampered with. The state object is '{stateFromRequest}'. The SHA256 hash of the state was expected to be '{expectedStateHash}' but was '{stateFromRequestHash}'."));
}
// Step 3: Validate the nonce is as we expected to prevent replay attacks
const string nonceDescription = "As a security precaution to prevent replay attacks, Octopus ensures the nonce returned in the claims from the external identity provider matches what it expected.";
var expectedNonceHash = string.Empty;
if (context.Request.Cookies.ContainsKey("n"))
{
expectedNonceHash = HttpUtility.UrlDecode(context.Request.Cookies["n"]);
}
if (string.IsNullOrWhiteSpace(expectedNonceHash))
{
return(BadRequest($"User login failed: Missing Nonce Hash Cookie. {nonceDescription} In this case the Cookie containing the SHA256 hash of the nonce is missing from the request."));
}
var nonceFromClaims = principal.Claims.FirstOrDefault(c => c.Type == "nonce");
if (nonceFromClaims == null)
{
return(BadRequest($"User login failed: Missing Nonce Claim. {nonceDescription} In this case the 'nonce' claim is missing from the security token."));
}
var nonceFromClaimsHash = Nonce.Protect(nonceFromClaims.Value);
if (nonceFromClaimsHash != expectedNonceHash)
{
return(BadRequest($"User login failed: Tampered Nonce. {nonceDescription} In this case the nonce looks like it has been tampered with or reused. The nonce is '{nonceFromClaims}'. The SHA256 hash of the state was expected to be '{expectedNonceHash}' but was '{nonceFromClaimsHash}'."));
}
// Step 4: Now the integrity of the request has been validated we can figure out which Octopus User this represents
var authenticationCandidate = principalToUserResourceMapper.MapToUserResource(principal);
// Step 4a: Check if this authentication attempt is already being banned
var action = loginTracker.BeforeAttempt(authenticationCandidate.Username, context.Request.UserHostAddress);
if (action == InvalidLoginAction.Ban)
{
return(BadRequest("You have had too many failed login attempts in a short period of time. Please try again later."));
}
// Step 4b: Try to get or create a the Octopus User this external identity represents
var userResult = GetOrCreateUser(authenticationCandidate, principal);
if (userResult.Succeeded)
{
loginTracker.RecordSucess(authenticationCandidate.Username, context.Request.UserHostAddress);
var authCookies = authCookieCreator.CreateAuthCookies(context.Request, userResult.User.IdentificationToken, SessionExpiry.TwentyDays);
return(RedirectResponse(response, stateFromRequest)
.WithCookies(authCookies)
.WithHeader("Expires", DateTime.UtcNow.AddYears(1).ToString("R", DateTimeFormatInfo.InvariantInfo)));
}
// Step 5: Handle other types of failures
loginTracker.RecordFailure(authenticationCandidate.Username, context.Request.UserHostAddress);
// Step 5a: Slow this potential attacker down a bit since they seem to keep failing
if (action == InvalidLoginAction.Slow)
{
sleep.For(1000);
}
if (!userResult.User.IsActive)
{
return(BadRequest($"The Octopus User Account '{authenticationCandidate.Username}' has been disabled by an Administrator. If you believe this to be a mistake, please contact your Octopus Administrator to have your account re-enabled."));
}
if (userResult.User.IsService)
{
return(BadRequest($"The Octopus User Account '{authenticationCandidate.Username}' is a Service Account, which are prevented from using Octopus interactively. Service Accounts are designed to authorize external systems to access the Octopus API using an API Key."));
}
return(BadRequest($"User login failed: {userResult.FailureReason}"));
}
public async Task <Response> ExecuteAsync(NancyContext context, IResponseFormatter response)
{
string state;
var principalContainer = await authTokenHandler.GetPrincipalAsync(context.Request, out state);
var principal = principalContainer.principal;
if (principal == null || !string.IsNullOrEmpty(principalContainer.error))
{
log.Info($"User login failed - {principalContainer.error}");
return(RedirectResponse(response, $"{context.Request.Form["state"]}?error={principalContainer.error}"));
}
var cookieStateHash = string.Empty;
if (context.Request.Cookies.ContainsKey("s"))
{
cookieStateHash = HttpUtility.UrlDecode(context.Request.Cookies["s"]);
}
if (State.Protect(state) != cookieStateHash)
{
log.Info($"User login failed - invalid state");
return(RedirectResponse(response, $"{state}?error=Invalid state"));
}
var cookieNonceHash = string.Empty;
if (context.Request.Cookies.ContainsKey("n"))
{
cookieNonceHash = HttpUtility.UrlDecode(context.Request.Cookies["n"]);
}
var nonce = principal.Claims.FirstOrDefault(c => c.Type == "nonce");
if (nonce == null || Nonce.Protect(nonce.Value) != cookieNonceHash)
{
log.Info("User login failed - invalid nonce");
return(RedirectResponse(response, $"{state}?error=Invalid nonce"));
}
var model = principalToUserHandler.GetUserResource(principal);
var action = loginTracker.BeforeAttempt(model.Username, context.Request.UserHostAddress);
if (action == InvalidLoginAction.Ban)
{
return(RedirectResponse(response, $"{state}?error=You have had too many failed login attempts in a short period of time. Please try again later."));
}
var userResult = GetOrCreateUser(model, principal);
if (!userResult.Succeeded)
{
loginTracker.RecordFailure(model.Username, context.Request.UserHostAddress);
if (action == InvalidLoginAction.Slow)
{
sleep.For(1000);
}
return(RedirectResponse(response, $"{state}?error={userResult.FailureReason}"));
}
if (!userResult.User.IsActive || userResult.User.IsService)
{
loginTracker.RecordFailure(model.Username, context.Request.UserHostAddress);
if (action == InvalidLoginAction.Slow)
{
sleep.For(1000);
}
return(RedirectResponse(response, $"{state}?error=Invalid username or password"));
}
loginTracker.RecordSucess(model.Username, context.Request.UserHostAddress);
var cookie = authCookieCreator.CreateAuthCookie(context, userResult.User.IdentificationToken, true);
return(RedirectResponse(response, state)
.WithCookie(cookie)
.WithHeader("Expires", DateTime.UtcNow.AddYears(1).ToString("R", DateTimeFormatInfo.InvariantInfo)));
}
