/*
* Deletes all specified access objects.
*/
public static void DeleteAccess(ApplicationContext context, Node args)
{
// Locking access to password file as we create new access object.
AuthFile.ModifyAuthFile(
context,
delegate(Node authFile) {
// Verifying access rights exists.
if (authFile ["access"] == null)
{
return;
}
// Iterating all access objects passed in by caller.
var access = authFile ["access"];
var delAccess = XUtil.Iterate <Node> (context, args).ToList();
foreach (var idxAccess in delAccess)
{
// Removing all matches by simply "untying" the access object matching currently iterated access object.
access.Children.First(ix => ix.Name == idxAccess.Name && ix.Get(context, "") == idxAccess.GetExValue(context, "")).UnTie();
}
});
}
/*
* Retrieves a specific user from system
*/
public static void GetUser(ApplicationContext context, Node args)
{
// Retrieving "auth" file in node format
var authFile = AuthFile.GetAuthFile(context);
// Iterating all users requested by caller
foreach (var idxUsername in XUtil.Iterate <string> (context, args))
{
// Checking if user exist
if (authFile ["users"] [idxUsername] == null)
{
throw new LambdaException(
string.Format("User '{0}' does not exist", idxUsername),
args,
context);
}
// Adding user's node as return value, and each property of user, except [password]
args.Add(idxUsername);
args [idxUsername].AddRange(authFile ["users"] [idxUsername].Clone().Children.Where(ix => ix.Name != "password"));
}
}
/*
* Changes password of "root" account, but only if existing root account's password
* is null. Used during setup of system
*/
public static void SetRootPassword(ApplicationContext context, Node args)
{
// Retrieving password given.
string password = args.GetExChildValue <string> ("password", context);
// Retrieving password rules from web.config, if any.
var pwdRulesNode = new Node(".p5.config.get", "p5.auth.password-rules");
var pwdRule = context.RaiseEvent(".p5.config.get", pwdRulesNode) [0]?.Get(context, "");
if (!string.IsNullOrEmpty(pwdRule))
{
// Verifying that specified password obeys by rules from web.config.
Regex regex = new Regex(pwdRule);
if (!regex.IsMatch(password))
{
// New password was not accepted, throwing an exception.
args.FindOrInsert("password").Value = "xxx";
throw new LambdaSecurityException("Password didn't obey by your configuration settings, which are as follows; " + pwdRule, args, context);
}
}
// Creating root account.
var rootAccountNode = new Node("", "root");
rootAccountNode.Add("password", password);
rootAccountNode.Add("role", "root");
CreateUser(context, rootAccountNode);
// Creating "guest account" section, which is needed for settings among other things.
var guestAccountName = context.RaiseEvent(".p5.auth.get-default-context-username").Get <string> (context);
AuthFile.ModifyAuthFile(
context,
delegate(Node authFile) {
authFile ["users"].Add(guestAccountName);
authFile ["users"] ["guest"].Add("role", context.RaiseEvent(".p5.auth.get-default-context-role").Get <string> (context));
});
}
/*
* Retrieves settings for currently logged in user
*/
public static void GetSettings(ApplicationContext context, Node args)
{
// Retrieving "auth" file in node format
var authFile = AuthFile.GetAuthFile(context);
// Checking if user exist
if (authFile ["users"] [context.Ticket.Username] == null)
{
throw new LambdaException(
"You do not exist",
args,
context);
}
// Checking if caller is retieving a single section.
var section = args.GetExValue(context, "");
if (string.IsNullOrEmpty(section))
{
// All settings invocation.
args.AddRange(authFile ["users"] [context.Ticket.Username].Clone().Children.Where(ix => ix.Name != "password" && ix.Name != "role"));
}
else if (section != "password" && section != "role")
{
// Single section invocation.
var sectionNode = authFile ["users"] [context.Ticket.Username] [section]?.Clone();
if (sectionNode != null)
{
args.Add(sectionNode);
}
}
else
{
// Illegal attempt at trying to retrieve role or password.
throw new LambdaSecurityException("Illegal invocation, you can't retrieve [password] or [role]", args, context);
}
}
/*
* Changes the password for currently logged in user
*/
public static void ChangePassword(ApplicationContext context, Node args)
{
string password = args.GetExValue(context, "");
if (string.IsNullOrEmpty(password))
{
throw new LambdaException("No password supplied", args, context);
}
string username = context.Ticket.Username;
// Locking access to password file as we edit user object
AuthFile.ModifyAuthFile(
context,
delegate(Node authFile) {
// Changing user's password
// Creating user salt, and retrieving system salt
var serverSalt = context.Raise(".p5.auth.get-server-salt").Get <string> (context);
// Then salting password with user salt and system, before salting it with system salt
var userPasswordFingerprint = context.Raise("p5.crypto.hash.create-sha256", new Node("", serverSalt + password)).Get <string> (context);
authFile ["users"][username]["password"].Value = userPasswordFingerprint;
});
}
/*
* Tries to login user according to given user credentials
*/
public static void Login(ApplicationContext context, Node args)
{
// Defaulting result of Active Event to unsuccessful
args.Value = false;
// Retrieving supplied credentials
string username = args.GetExChildValue <string> ("username", context);
string password = args.GetExChildValue <string> ("password", context);
bool persist = args.GetExChildValue("persist", context, false);
// Getting password file in Node format, but locking file access as we retrieve it
Node pwdFile = AuthFile.GetAuthFile(context);
// Checking for match on specified username
Node userNode = pwdFile["users"][username];
if (userNode == null)
{
throw new LambdaSecurityException("Credentials not accepted", args, context);
}
// Getting system salt
var serverSalt = context.Raise(".p5.auth.get-server-salt").Get <string> (context);
// Then creating system fingerprint from given password
var cookiePasswordFingerprint = context.Raise("p5.crypto.hash.create-sha256", new Node("", serverSalt + password)).Get <string> (context);
// Checking for match on password
if (userNode["password"].Get <string> (context) != cookiePasswordFingerprint)
{
throw new LambdaSecurityException("Credentials not accepted", args, context); // Exact same wording as above! IMPORTANT!!
}
// Success, creating our ticket
string role = userNode["role"].Get <string>(context);
SetTicket(new ApplicationContext.ContextTicket(username, role, false));
args.Value = true;
// Removing last login attempt, to reset brute force login cool off seconds for user's IP address
LastLoginAttemptForIP = DateTime.MinValue;
// Associating newly created Ticket with Application Context, since user now possibly have extended rights
context.UpdateTicket(GetTicket(context));
// Checking if we should create persistent cookie on disc to remember username for given client
if (persist)
{
// Caller wants to create persistent cookie to remember username/password
HttpCookie cookie = new HttpCookie(_credentialCookieName);
cookie.Expires = DateTime.Now.AddDays(context.Raise(
".p5.config.get",
new Node(".p5.config.get", "p5.auth.credential-cookie-valid")) [0].Get <int> (context));
cookie.HttpOnly = true; // To avoid JavaScript access to credential cookie
// Notice, we use another fingerprint as password for cookie than what we use for storing cookie in auth file
// The "system salted fingerprint" hence never leaves the server
// If this was not the case, then the system fingerprint would effectively BE the password, allowing anyone
// who somehow gets access to "auth" file also to log in by creating false cookies
cookie.Value = username + " " + cookiePasswordFingerprint;
HttpContext.Current.Response.Cookies.Add(cookie);
}
// Making sure we invoke an [.onlogin] lambda callbacks for user.
var onLogin = new Node();
GetSettings(context, onLogin);
if (onLogin [".onlogin"] != null)
{
var lambda = onLogin[".onlogin"].Clone();
context.Raise("eval", lambda);
}
}
/*
* Creates a new user
*/
public static void CreateUser(ApplicationContext context, Node args)
{
string username = args.GetExValue <string>(context);
string password = args.GetExChildValue <string>("password", context);
string role = args.GetExChildValue <string>("role", context);
// Making sure [password] never leaves method, in case of exceptions
args.FindOrInsert("password").Value = "xxx";
// Basic syntax checking
if (string.IsNullOrEmpty(username) || string.IsNullOrEmpty(password) || string.IsNullOrEmpty(role))
{
throw new LambdaException(
"User must have [username], [password] and [role] at the very least",
args,
context);
}
// Verifying username is valid, since we'll need to create a folder for user
VerifyUsernameValid(username);
// Creating user salt, and retrieving system salt
var serverSalt = context.Raise(".p5.auth.get-server-salt").Get <string> (context);
// Then salting password with user salt, before salting it with system salt
var userPasswordFingerprint = context.Raise("p5.crypto.hash.create-sha256", new Node("", serverSalt + password)).Get <string> (context);
// Locking access to password file as we create new user object
AuthFile.ModifyAuthFile(
context,
delegate(Node authFile) {
// Checking if user exist from before
if (authFile["users"][username] != null)
{
throw new LambdaException(
"Sorry, that [username] is already taken by another user in the system",
args,
context);
}
// Adding user
authFile["users"].Add(username);
// Creates a salt and password for user
authFile ["users"].LastChild.Add("password", userPasswordFingerprint);
// Adding user to specified role
authFile ["users"].LastChild.Add("role", role);
// Adding all other specified objects to user
foreach (var idxNode in args.Children.Where(ix => ix.Name != "username" && ix.Name != "password" && ix.Name != "role"))
{
// Only adding nodes with some sort of actual value
if (idxNode.Value != null || idxNode.Children.Count > 0)
{
authFile["users"].LastChild.Add(idxNode.Clone());
}
}
});
// Creating newly created user's directory structure
CreateUserDirectory(context.Raise(".p5.core.application-folder").Get <string>(context), username);
}
/*
* Returns true if root account exists, which implies that server has been setup.
*/
public static bool HasRootAccount(ApplicationContext context)
{
// Retrieving password file, and returning true if root user exists.
return(AuthFile.GetAuthFile(context) ["users"] ["root"] != null);
}
/*
* Tries to login user according to given user credentials
*/
public static void Login(ApplicationContext context, Node args)
{
// Defaulting result of Active Event to unsuccessful.
args.Value = false;
// Retrieving supplied credentials
string username = args.GetExChildValue <string> ("username", context);
string password = args.GetExChildValue <string> ("password", context);
args.FindOrInsert("password").Value = "xxx"; // In case an exception occurs.
bool persist = args.GetExChildValue("persist", context, false);
/*
* Checking if current username has attempted to login just recently, and the
* configured timespan for each successive login attempt per user, has not passed.
*
* This should be able to defend us from a "brute force password attack".
*/
var bruteConf = new Node(".p5.config.get", ".p5.auth.cooldown-period");
var cooldown = context.RaiseEvent(".p5.config.get", bruteConf) [0]?.Get(context, -1) ?? -1;
if (cooldown != -1)
{
// User has configured the system to have a "cooldown period" for successive login attempts.
var bruteForceLastAttempt = new Node(".p5.web.application.get", ".p5.io.last-login-attempt-for-" + username);
var lastAttemptNode = context.RaiseEvent(".p5.web.application.get", bruteForceLastAttempt);
if (lastAttemptNode.Count > 0)
{
// Previous attempt has been attempted.
var date = lastAttemptNode [0].Get <DateTime> (context, DateTime.MinValue);
int timeSpanSeconds = System.Convert.ToInt32((DateTime.Now - date).TotalSeconds);
if (timeSpanSeconds < cooldown)
{
throw new LambdaException("You need to wait " + (cooldown - timeSpanSeconds) + " seconds before you can try again", args, context);
}
}
}
// Getting password file in Node format, but locking file access as we retrieve it
Node pwdFile = AuthFile.GetAuthFile(context);
// Checking for match on specified username
Node userNode = pwdFile ["users"] [username];
if (userNode == null)
{
throw new LambdaSecurityException("Credentials not accepted", args, context);
}
// Getting system salt
var serverSalt = context.RaiseEvent(".p5.auth.get-server-salt").Get <string> (context);
// Then creating system fingerprint from given password
var hashedPassword = context.RaiseEvent("p5.crypto.hash.create-sha256", new Node("", serverSalt + password)).Get <string> (context);
// Checking for match on password
if (userNode ["password"].Get <string> (context) != hashedPassword)
{
// Making sure we guard against brute force password attacks.
var bruteForceLastAttempt = new Node(".p5.web.application.set", ".p5.io.last-login-attempt-for-" + username);
bruteForceLastAttempt.Add("src", DateTime.Now);
context.RaiseEvent(".p5.web.application.set", bruteForceLastAttempt);
throw new LambdaSecurityException("Credentials not accepted", args, context);
}
// Success, creating our ticket
string role = userNode ["role"].Get <string> (context);
SetTicket(new ContextTicket(username, role, false));
args.Value = true;
// Removing last login attempt, to reset brute force login cool off seconds for user's IP address
LastLoginAttemptForIP = DateTime.MinValue;
// Associating newly created Ticket with Application Context, since user now possibly have extended rights
context.UpdateTicket(GetTicket(context));
// Checking if we should create persistent cookie on disc to remember username for given client
if (persist)
{
// Caller wants to create persistent cookie to remember username/password
var cookie = new HttpCookie(_credentialCookieName);
cookie.Expires = DateTime.Now.AddDays(context.RaiseEvent(
".p5.config.get",
new Node(".p5.config.get", "p5.auth.credential-cookie-valid")) [0].Get <int> (context));
cookie.HttpOnly = true; // To avoid JavaScript access to credential cookie
// Notice, we use another fingerprint as password for cookie than what we use for storing cookie in auth file
// The "system salted fingerprint" hence never leaves the server
// If this was not the case, then the system fingerprint would effectively BE the password, allowing anyone
// who somehow gets access to "auth" file also to log in by creating false cookies
cookie.Value = username + " " + hashedPassword;
HttpContext.Current.Response.Cookies.Add(cookie);
}
// Making sure we invoke an [.onlogin] lambda callbacks for user.
var onLogin = new Node();
GetSettings(context, onLogin);
if (onLogin [".onlogin"] != null)
{
var lambda = onLogin [".onlogin"].Clone();
context.RaiseEvent("eval", lambda);
}
}
/*
* Creates a new user.
*/
public static void CreateUser(ApplicationContext context, Node args)
{
// Retrieving arguments.
var username = args.GetExValue <string> (context);
var password = args.GetExChildValue <string> ("password", context);
var role = args.GetExChildValue <string> ("role", context);
// Sanity checking role name towards guest account name.
if (role == context.RaiseEvent(".p5.auth.get-default-context-role").Get <string> (context))
{
throw new LambdaException("Sorry, but that's the name of our guest account role.", args, context);
}
// Sanity checking username towards guest account name.
if (username == context.RaiseEvent(".p5.auth.get-default-context-username").Get <string> (context))
{
throw new LambdaException("Sorry, but that's the name of our guest account.", args, context);
}
// Making sure [password] never leaves method in case of an exception.
args.FindOrInsert("password").Value = "xxx";
// Retrieving password rules from web.config, if any.
if (!Passwords.IsGoodPassword(context, password))
{
// New password was not accepted, throwing an exception.
throw new LambdaSecurityException(
"Password didn't obey by your configuration settings, which are as follows; " +
Passwords.PasswordRuleDescription(context),
args,
context);
}
// Basic sanity check new user's data.
if (string.IsNullOrEmpty(username) || string.IsNullOrEmpty(password) || string.IsNullOrEmpty(role))
{
throw new LambdaException(
"User must have username as value, [password] and [role] at the very least",
args,
context);
}
// Verifying username is valid, since we'll need to create a folder for user.
VerifyUsernameValid(username);
// To reduce lock time of "auth" file, we execute Blow Fish hashing before we enter lock.
password = Passwords.SaltAndHashPassword(context, password);
// Locking access to password file as we create new user object.
AuthFile.ModifyAuthFile(
context,
delegate(Node authFile) {
// Checking if user exist from before.
if (authFile ["users"] [username] != null)
{
throw new LambdaException(
"Sorry, that [username] is already taken by another user in the system",
args,
context);
}
// Adding user.
var userNode = authFile ["users"].Add(username).LastChild;
// Salting and hashing password, before storing it in "auth" file.
userNode.Add("password", password);
// Adding user to specified role.
userNode.Add("role", role);
// Adding all other specified objects to user.
userNode.AddRange(args.Children.Where(ix => ix.Name != "password" && ix.Name != "role").Select(ix => ix.Clone()));
});
// Creating newly created user's directory structure.
CreateUserDirectory(context, username);
}
/*
* Edits an existing user
*/
public static void EditUser(ApplicationContext context, Node args)
{
// Retrieving username, and sanity checking invocation.
string username = args.GetExValue <string> (context);
if (args ["username"] != null)
{
throw new LambdaSecurityException("Cannot change username for user", args, context);
}
// Retrieving new password and role, defaulting to null, which will not update existing values.
string newPassword = args.GetExChildValue <string> ("password", context);
string newRole = args.GetExChildValue <string> ("role", context);
// Sanity checking role name towards guest account name.
if (newRole == context.RaiseEvent(".p5.auth.get-default-context-role").Get <string> (context))
{
throw new LambdaException("Sorry, but that's the name of our guest account role.", args, context);
}
// Retrieving password rules from web.config, if any.
// But only if a new password was given.
if (!string.IsNullOrEmpty(newPassword))
{
// Verifying password conforms to password rules.
var pwdRulesNode = new Node(".p5.config.get", "p5.auth.password-rules");
var pwdRule = context.RaiseEvent(".p5.config.get", pwdRulesNode) [0]?.Get(context, "");
if (!string.IsNullOrEmpty(pwdRule))
{
// Verifying that specified password obeys by rules from web.config.
Regex regex = new Regex(pwdRule);
if (!regex.IsMatch(newPassword))
{
// New password was not accepted, throwing an exception.
args.FindOrInsert("password").Value = "xxx";
throw new LambdaSecurityException("Password didn't obey by your configuration settings, which are as follows; " + pwdRule, args, context);
}
}
}
// Retrieving system salt before we enter write lock. (important, since otherwise we'd have a deadlock condition here).
var serverSalt = newPassword == null ? null : context.RaiseEvent(".p5.auth.get-server-salt").Get <string> (context);
// Locking access to password file as we edit user object.
AuthFile.ModifyAuthFile(
context,
delegate(Node authFile) {
// Checking to see if user exist.
if (authFile ["users"] [username] == null)
{
throw new LambdaException(
"Sorry, that user does not exist",
args,
context);
}
// Updating user's password, but only if a new password was supplied by caller.
if (!string.IsNullOrEmpty(newPassword))
{
// Making sure we salt password with system salt, before we create our SHA256 value, which is what we actually store in our "auth" file.
var userPasswordFingerprint = context.RaiseEvent("p5.crypto.hash.create-sha256", new Node("", serverSalt + newPassword)).Get <string> (context);
authFile ["users"] [username] ["password"].Value = userPasswordFingerprint;
}
// Updating user's role, if a new role was supplied by caller.
if (newRole != null)
{
authFile ["users"] [username] ["role"].Value = newRole;
}
// Checking if caller wants to edit settings.
if (args.Name == "p5.auth.users.edit")
{
// Removing old settings.
authFile ["users"] [username].RemoveAll(ix => ix.Name != "password" && ix.Name != "role");
// Adding all other specified objects to user.
foreach (var idxNode in args.Children.Where(ix => ix.Name != "password" && ix.Name != "role"))
{
authFile ["users"] [username].Add(idxNode.Clone());
}
}
});
}
/*
* Creates a new user
*/
public static void CreateUser(ApplicationContext context, Node args)
{
// Retrieving arguments.
string username = args.GetExValue <string> (context);
string password = args.GetExChildValue <string> ("password", context);
string role = args.GetExChildValue <string> ("role", context);
// Sanity checking role name towards guest account name.
if (role == context.RaiseEvent(".p5.auth.get-default-context-role").Get <string> (context))
{
throw new LambdaException("Sorry, but that's the name of our guest account role.", args, context);
}
// Sanity checking username towards guest account name.
if (username == context.RaiseEvent(".p5.auth.get-default-context-username").Get <string> (context))
{
throw new LambdaException("Sorry, but that's the name of our guest account.", args, context);
}
// Making sure [password] never leaves method.
args.FindOrInsert("password").Value = "xxx";
// Retrieving password rules from web.config, if any.
var pwdRulesNode = new Node(".p5.config.get", "p5.auth.password-rules");
var pwdRule = context.RaiseEvent(".p5.config.get", pwdRulesNode) [0]?.Get(context, "");
if (!string.IsNullOrEmpty(pwdRule))
{
// Verifying that specified password obeys by rules from web.config.
Regex regex = new Regex(pwdRule);
if (!regex.IsMatch(password))
{
// New password was not accepted, throwing an exception.
args.FindOrInsert("password").Value = "xxx";
throw new LambdaSecurityException("Password didn't obey by your configuration settings, which are as follows; " + pwdRule, args, context);
}
}
// Basic sanity check.
if (string.IsNullOrEmpty(username) || string.IsNullOrEmpty(password) || string.IsNullOrEmpty(role))
{
throw new LambdaException(
"User must have username as value, [password] and [role] at the very least",
args,
context);
}
// Verifying username is valid, since we'll need to create a folder for user.
VerifyUsernameValid(username);
// Retrieving system salt before we enter write lock.
var serverSalt = context.RaiseEvent(".p5.auth.get-server-salt").Get <string> (context);
// Then salting user's password.
var userPasswordFingerprint = context.RaiseEvent("p5.crypto.hash.create-sha256", new Node("", serverSalt + password)).Get <string> (context);
// Locking access to password file as we create new user object.
AuthFile.ModifyAuthFile(
context,
delegate(Node authFile) {
// Checking if user exist from before.
if (authFile ["users"] [username] != null)
{
throw new LambdaException(
"Sorry, that [username] is already taken by another user in the system",
args,
context);
}
// Adding user.
authFile ["users"].Add(username);
// Creates a salt and password for user.
authFile ["users"].LastChild.Add("password", userPasswordFingerprint);
// Adding user to specified role.
authFile ["users"].LastChild.Add("role", role);
// Adding all other specified objects to user.
foreach (var idxNode in args.Children.Where(ix => ix.Name != "username" && ix.Name != "password" && ix.Name != "role"))
{
// Only adding nodes with some sort of actual value.
if (idxNode.Value != null || idxNode.Count > 0)
{
authFile ["users"].LastChild.Add(idxNode.Clone());
}
}
});
// Creating newly created user's directory structure.
CreateUserDirectory(context.RaiseEvent(".p5.core.application-folder").Get <string> (context), username);
}
/*
* Returns all access objects for system.
*/
public static void ListAccess(ApplicationContext context, Node args)
{
// Getting password file in Node format.
Node pwdFile = AuthFile.GetAuthFile(context);
// Checking if caller wants to remove GUID IDs of access objects in the system.
var keepGuids = args.GetExChildValue("guids", context, false);
// Checking if we have any access rights in system.
if (pwdFile ["access"] == null)
{
return;
}
// Checking which role caller requests access objects on behalf.
string roles = null;
if (context.Ticket.Role == "root")
{
// Checking if caller requested a particular role.
roles = args.GetExChildValue <string> ("role", context, null);
}
else
{
// A non-root user is not allowed to request anything besides his own access objects.
if (args ["role"] != null)
{
throw new LambdaException("A non-root user cannot request access objects for anything but his own role", args, context);
}
// Making sure user only retrieves access objects that are relevant for his own role.
roles = context.Ticket.Role;
}
// Looping through each user object in password file, retrieving all roles.
foreach (var idxAccessNode in pwdFile["access"].Children)
{
// Checking what types of access object(s) are relevant to caller.
if (roles == null)
{
// Cloning access object node.
var cur = idxAccessNode.Clone();
// Removing GUID IDs if caller specified we should do so.
Guid guid;
if (!keepGuids && Guid.TryParse(idxAccessNode.Get <string> (context), out guid))
{
cur.Value = null;
}
// Caller wants everything.
args.Add(cur);
}
else
{
// Checking if currently iterated access object is relevant to caller.
if (idxAccessNode.Name == "*" || idxAccessNode.Name == roles)
{
// Cloning access object node.
var cur = idxAccessNode.Clone();
// Removing GUID IDs if caller specified we should do so.
Guid guid;
if (!keepGuids && Guid.TryParse(idxAccessNode.Get <string> (context), out guid))
{
cur.Value = null;
}
// Adding currently iterated access object.
args.Add(cur);
}
}
}
}
/*
* Returns PGP key's fingerprint.
*/
public static string GetFingerprint(ApplicationContext context)
{
// Retrieving "auth" file in node format, for then to return fingerprint back to caller.
return(AuthFile.GetAuthFile(context).GetChildValue <string> (GnuPgpFingerprintNodeName, context));
}
/*
* Tries to login user according to given user credentials.
*/
public static void Login(ApplicationContext context, Node args)
{
// Defaulting result of Active Event to unsuccessful.
args.Value = false;
// Retrieving supplied credentials.
var username = args.GetExChildValue <string> ("username", context);
var password = args.GetExChildValue <string> ("password", context);
args.FindOrInsert("password").Value = "xxx"; // In case an exception occurs.
var persist = args.GetExChildValue("persist", context, false);
// Retrieving password file as a Node.
var pwdFile = AuthFile.GetAuthFile(context);
/*
* Checking for match on specified username.
*/
var userNode = pwdFile ["users"] [username];
if (userNode == null)
{
// Username doesn't exist.
throw new LambdaSecurityException(_credentialsNotAcceptedException, args, context);
}
/*
* Checking if current username has attempted to login just recently, and the
* configured timespan for each successive login attempt per user, has not passed.
*
* This should be able to provide some rudimentary defense from a "brute force password attack".
*
* Notice, we do this after we have checked if the username exists, to avoid having an adversary
* flood the server's cache with bogus usernames associated with DateTime objects.
* We also us the web cache, which (of course) means the object will only exists for some
* time, defaulting to the settings of the web cache for your system.
*/
var cooldown = context.RaiseEvent(
".p5.config.get",
new Node(".p5.config.get", _cooldownPeriodConfigName)) [0]?.Get(context, -1) ?? -1;
if (cooldown != -1)
{
// User has configured the system to have a "cooldown period" for successive login attempts.
var bruteForceLastAttempt = new Node(".p5.web.cache.get", _bruteForceCacheName + username);
var lastAttemptNode = context.RaiseEvent(".p5.web.cache.get", bruteForceLastAttempt);
if (lastAttemptNode.Count > 0)
{
// Previous attempt has been attempted recently.
var date = lastAttemptNode [0].Get <DateTime> (context, DateTime.MinValue);
var timeSpanSeconds = Convert.ToInt32((DateTime.Now - date).TotalSeconds);
if (timeSpanSeconds < cooldown)
{
// Cooldown period has not passed.
throw new LambdaException("You need to wait " + (cooldown - timeSpanSeconds) + " seconds before you can try again", args, context);
}
}
}
// Checking for match on password.
if (!Passwords.VerifyPasswordIsCorrect(password, userNode ["password"].Get <string> (context)))
{
/*
* Making sure we guard against brute force password attacks, before we throw security exception.
*
* Notice, this prevents the same username from attempting to login more than once every n seconds,
* which is configurable in the config file of the app.
*/
var bruteForceLastAttempt = new Node(".p5.web.cache.set", _bruteForceCacheName + username);
bruteForceLastAttempt.Add("src", DateTime.Now);
context.RaiseEvent(".p5.web.cache.set", bruteForceLastAttempt);
throw new LambdaSecurityException(_credentialsNotAcceptedException, args, context);
}
// Success, creating our context ticket.
var role = userNode ["role"].Get <string> (context);
SetTicket(context, new ContextTicket(username, role, false));
// Signaling success to caller.
args.Value = true;
// Checking if we should create persistent cookie on disc to remember username/password for given client.
if (persist)
{
// Caller wants to create persistent cookie to remember username/password.
var cookie = new HttpCookie(_credentialCookieName);
cookie.Expires = DateTime.Now.AddDays(context.RaiseEvent(
".p5.config.get",
new Node(".p5.config.get", "p5.auth.credential-cookie-valid")) [0].Get <int> (context));
// To avoid JavaScript access to credential cookie.
cookie.HttpOnly = true;
/*
* The value of our cookie is in "username hashed-password" format.
*
* This is an entropy of roughly 1.1579e+77, making a brute force attack
* impossible, at least without a Rainbow/Dictionary attack, which should
* be effectively prevented, by having a single static server salt,
* which again is cryptographically secured and persisted to disc
* in the "auth" file, and hence normally inaccessible for an adversary.
*
* Notice, we double hash the password we store in our cookie, to make
* sure we never expose the parts of our password we store in our "auth" file.
*/
cookie.Value = username + " " + Passwords.HashPasswordForCookieStorage(
context,
userNode ["password"].Get <string> (context));
HttpContext.Current.Response.Cookies.Add(cookie);
}
// Evaluates user's [.onlogin] section, if it exists.
EvaluateOnLoginIfExisting(context);
}
/*
* Returns server-salt for application.
*/
public static string GetServerSalt(ApplicationContext context)
{
// Retrieving "auth" file in node format.
return(AuthFile.GetAuthFile(context).GetChildValue <string> ("server-salt", context));
}
/*
* Edits an existing user.
*/
public static void EditUser(ApplicationContext context, Node args)
{
// Retrieving username, and sanity checking invocation.
var username = args.GetExValue <string> (context);
if (args ["username"] != null)
{
throw new LambdaSecurityException("Cannot change username for user", args, context);
}
// Retrieving new password and role, defaulting to null, which will not update existing values.
var password = args.GetExChildValue <string> ("password", context, null);
var role = args.GetExChildValue <string> ("role", context, null);
// Sanity checking role name towards guest account name.
if (role == context.RaiseEvent(".p5.auth.get-default-context-role").Get <string> (context))
{
throw new LambdaException("Sorry, but that's the name of your system's guest account role.", args, context);
}
// Changing user's password, but only if a [password] argument was explicitly supplied by caller.
if (!string.IsNullOrEmpty(password))
{
// Verifying password conforms to password rules.
if (!Passwords.IsGoodPassword(context, password))
{
// New password was not accepted, throwing an exception.
args.FindOrInsert("password").Value = "xxx";
var description = Passwords.PasswordRuleDescription(context);
throw new LambdaSecurityException("Password didn't obey by your configuration settings, which are as follows; " + description, args, context);
}
}
// To reduce lock time of "auth" file we execute Blow Fish hashing before we enter lock.
password = password == null ? null : Passwords.SaltAndHashPassword(context, password);
// Locking access to password file as we edit user object.
AuthFile.ModifyAuthFile(
context,
delegate(Node authFile) {
// Checking to see if user exist.
if (authFile ["users"] [username] == null)
{
throw new LambdaException(
"Sorry, that user does not exist",
args,
context);
}
// Updating user's password, but only if a new password was supplied by caller.
if (!string.IsNullOrEmpty(password))
{
authFile ["users"] [username] ["password"].Value = password;
}
// Updating user's role, if a new role was supplied by caller.
if (role != null)
{
authFile ["users"] [username] ["role"].Value = role;
}
// Checking if caller wants to edit settings.
if (args.Name == "p5.auth.users.edit")
{
// Removing old settings.
authFile ["users"] [username].RemoveAll(ix => ix.Name != "password" && ix.Name != "role" && ix.Name != "salt");
// Adding all other specified objects to user.
foreach (var idxNode in args.Children.Where(ix => ix.Name != "password" && ix.Name != "role" && ix.Name != "salt"))
{
authFile ["users"] [username].Add(idxNode.Clone());
}
}
});
}
