/// <summary>
/// Creates a new instance of an identity, but impersonated by the specified user.
/// </summary>
/// <param name="userID">The unique identity of the user to impersonate.</param>
/// <param name="name">The name of the user to impersonate.</param>
/// <param name="impersonator">The impersonator's authenticated identity.</param>
public UserIdentity(Guid userID, string name, UserIdentity impersonator)
{
while (impersonator.ImpersonatorIdentity != null) // should be max 1 level deep
impersonator = impersonator.ImpersonatorIdentity; //don't impersonate multiple levels deep.
if (impersonator == null || !impersonator.IsAuthenticated || impersonator.Ticket == null ||
impersonator.Ticket.UserSession == null || impersonator.Ticket.UserSession.ExpirationDate < DateTime.UtcNow)
throw new ApplicationException("You cannot impersonate at this time, because your session has ended.");
Ticket = new AuthenticationHistory
{
CreatedDate = DateTime.Now,
IPAddress = impersonator.Ticket.IPAddress,
IsAuthenticated = impersonator.Ticket.IsAuthenticated,
UserName = name,
SessionID = impersonator.Ticket.SessionID,
UserSession =
new UserSession
{
CreatedDate = DateTime.Now,
ExpirationDate = impersonator.Ticket.UserSession.ExpirationDate,
RenewalToken = impersonator.Ticket.UserSession.RenewalToken,
RenewedDate = impersonator.Ticket.UserSession.RenewedDate,
SessionID = impersonator.Ticket.SessionID,
UserID = userID
}
};
ImpersonatorIdentity = impersonator;
}
/// <summary>
/// Creates a new instance of an identity, but impersonated by the specified user.
/// </summary>
/// <param name="userID">The unique identity of the user to impersonate.</param>
/// <param name="name">The name of the user to impersonate.</param>
/// <param name="impersonator">The impersonator's authenticated identity.</param>
public UserIdentity(Guid userID, string name, UserIdentity impersonator)
{
while (impersonator.ImpersonatorIdentity != null) // should be max 1 level deep
{
impersonator = impersonator.ImpersonatorIdentity; //don't impersonate multiple levels deep.
}
if (impersonator == null || !impersonator.IsAuthenticated || impersonator.Ticket == null ||
impersonator.Ticket.UserSession == null || impersonator.Ticket.UserSession.ExpirationDate < DateTime.UtcNow)
{
throw new ApplicationException("You cannot impersonate at this time, because your session has ended.");
}
Ticket = new AuthenticationHistory
{
CreatedDate = DateTime.Now,
IPAddress = impersonator.Ticket.IPAddress,
IsAuthenticated = impersonator.Ticket.IsAuthenticated,
UserName = name,
SessionID = impersonator.Ticket.SessionID,
UserSession =
new UserSession
{
CreatedDate = DateTime.Now,
ExpirationDate = impersonator.Ticket.UserSession.ExpirationDate,
RenewalToken = impersonator.Ticket.UserSession.RenewalToken,
RenewedDate = impersonator.Ticket.UserSession.RenewedDate,
SessionID = impersonator.Ticket.SessionID,
UserID = userID
}
};
ImpersonatorIdentity = impersonator;
}
/// <summary>
/// Creates a user instance from an authentication attempt.
/// </summary>
/// <param name="ticket">The authentication results.</param>
/// <param name="authType">The provider that authentication this identity.</param>
public UserIdentity(AuthenticationHistory ticket, String authType)
{
if (ticket == null)
{
Ticket = new AuthenticationHistory
{
IsAuthenticated = false,
UserName = string.Empty,
CreatedDate = DateTime.Now,
UserSession = new UserSession {ExpirationDate = DateTime.Now, UserID = Guid.Empty}
};
_authenticationType = authType ?? "None";
}
else
{
Ticket = ticket;
_authenticationType = authType;
}
}
/// <summary>
/// Creates a user instance from an authentication attempt.
/// </summary>
/// <param name="ticket">The authentication results.</param>
/// <param name="authType">The provider that authentication this identity.</param>
public UserIdentity(AuthenticationHistory ticket, String authType)
{
if (ticket == null)
{
Ticket = new AuthenticationHistory
{
IsAuthenticated = false,
UserName = string.Empty,
CreatedDate = DateTime.Now,
UserSession = new UserSession {
ExpirationDate = DateTime.Now, UserID = Guid.Empty
}
};
_authenticationType = authType ?? "None";
}
else
{
Ticket = ticket;
_authenticationType = authType;
}
}
protected override void InsertUserHistory(AuthenticationHistory history)
{
throw new NotImplementedException();
}
/// <summary> /// Inserts a new user authentication history. /// </summary> /// <param name="history"></param> protected abstract void InsertUserHistory(AuthenticationHistory history);
/// <summary>
/// Authenticates a user with the requested rule options. This internal method is called
/// by the other public versions of the method. Override in a derived class if you want
/// to change the rule interpretations or add new rules.
/// </summary>
/// <param name="name"></param>
/// <param name="password"></param>
/// <param name="duration"></param>
/// <param name="ipAddress"></param>
/// <param name="checkHistory"></param>
/// <param name="allowUpdateHash"></param>
/// <param name="result"></param>
/// <returns></returns>
protected virtual UserIdentity AuthenticateUser(string name, string password,
UserSessionDurationType duration, string ipAddress, bool checkHistory,
bool allowUpdateHash, ExecutionResults result)
{
if (checkHistory)
{
var recentFailures = GetRecentFailedUserNameAuthenticationCount(name);
if (recentFailures > AllowedFailuresPerPeriod)
return FailAuthenticateUser(name, ipAddress, result);
}
var user = GetUserByName(name);
if (user == null)
return FailAuthenticateUser(name, ipAddress, result);
var salt = GetUserSalt(user.UserID);
if (salt == null)
return FailAuthenticateUser(name, ipAddress, result);
//this should get a named hashProvider used to originally hash the password...
// fallback to 'default' provider in legacy case when we didn't store the name.
var hasher = !string.IsNullOrEmpty(salt.HashName) ? HashManager.Providers[salt.HashName] : HashManager.DefaultProvider;
var passwordHash = hasher.Hash(salt.PasswordSalt, password, salt.HashGroup + BaseHashIterations);
if (user.PasswordHash != passwordHash)
return FailAuthenticateUser(name, ipAddress, result);
var session = new UserSession
{
CreatedDate = DateTime.UtcNow,
ExpirationDate = DateTime.UtcNow.AddMinutes(duration == UserSessionDurationType.PublicComputer ? PublicSessionDuration : ExtendedSessionDuration),
UserID = user.UserID,
RenewalToken = Guid.NewGuid()
};
var history = new AuthenticationHistory
{
CreatedDate = session.CreatedDate,
IPAddress = ipAddress,
IsAuthenticated = true,
UserName = name,
SessionID = session.SessionID,
UserSession = session
};
using (var scope = new System.Transactions.TransactionScope())
{
if (allowUpdateHash && (hasher.IsObsolete || user.PasswordHashUpdatedDate < DateTime.UtcNow.AddMonths(-1)))
{
//update hashes on regular basis, keeps the iterations in latest range for current users, and with a 'current' hash provider.
hasher = HashManager.SelectProvider();
salt.PasswordSalt = hasher.GetSalt();
salt.HashGroup = new Random(DateTime.Now.Second).Next(HashGroupMinimum, HashGroupMaximum);
salt.HashName = hasher.Name;
user.PasswordHash = hasher.Hash(salt.PasswordSalt, password, salt.HashGroup + BaseHashIterations);
user.PasswordHashUpdatedDate = DateTime.UtcNow;
//starts as a lightweight transaction
SaveUser(user);
//enlists in a full distributed transaction if users and salts have different connection strings
SaveUserSalt(salt);
}
//either continues distributed transaction if applicable,
// or creates a new lightweight transaction for these two commands
SaveUserSession(session);
InsertUserHistory(history);
scope.Complete();
}
return new UserIdentity(history, Name);
}
/// <summary>
/// Inserts a new user authentication history.
/// </summary>
/// <param name="history"></param>
protected override void InsertUserHistory(AuthenticationHistory history)
{
using (var cn = new SqlConnection(ConnectionStringAudit))
{
cn.Open();
using (var cmd = new SqlCommand())
{
cmd.Connection = cn;
cmd.CommandType = System.Data.CommandType.Text;
cmd.CommandText = @"insert into Security.AuthenticationHistory
(UserName, IpAddress, IsAuthenticated)
Values (@UserName, @IpAddress, @IsAuthenticated)";
cmd.Parameters.AddWithValue("UserName", history.UserName);
cmd.Parameters.AddWithValue("IpAddress", history.IPAddress);
cmd.Parameters.AddWithValue("IsAuthenticated", history.IsAuthenticated);
cmd.ExecuteNonQuery();
}
}
SaveUserSession(history.UserSession);
}
/// <summary> /// Inserts a new user authentication history. /// </summary> /// <param name="history"></param> protected abstract void InsertUserHistory(AuthenticationHistory history);
/// <summary>
/// Authenticates a user with the requested rule options. This internal method is called
/// by the other public versions of the method. Override in a derived class if you want
/// to change the rule interpretations or add new rules.
/// </summary>
/// <param name="name"></param>
/// <param name="password"></param>
/// <param name="duration"></param>
/// <param name="ipAddress"></param>
/// <param name="checkHistory"></param>
/// <param name="allowUpdateHash"></param>
/// <param name="result"></param>
/// <returns></returns>
protected virtual UserIdentity AuthenticateUser(string name, string password,
UserSessionDurationType duration, string ipAddress, bool checkHistory,
bool allowUpdateHash, ExecutionResults result)
{
if (checkHistory)
{
var recentFailures = GetRecentFailedUserNameAuthenticationCount(name);
if (recentFailures > AllowedFailuresPerPeriod)
{
return(FailAuthenticateUser(name, ipAddress, result));
}
}
var user = GetUserByName(name);
if (user == null)
{
return(FailAuthenticateUser(name, ipAddress, result));
}
var salt = GetUserSalt(user.UserID);
if (salt == null)
{
return(FailAuthenticateUser(name, ipAddress, result));
}
//this should get a named hashProvider used to originally hash the password...
// fallback to 'default' provider in legacy case when we didn't store the name.
var hasher = !string.IsNullOrEmpty(salt.HashName) ? HashManager.Providers[salt.HashName] : HashManager.DefaultProvider;
var passwordHash = hasher.Hash(salt.PasswordSalt, password, salt.HashGroup + BaseHashIterations);
if (user.PasswordHash != passwordHash)
{
return(FailAuthenticateUser(name, ipAddress, result));
}
var session = new UserSession
{
CreatedDate = DateTime.UtcNow,
ExpirationDate = DateTime.UtcNow.AddMinutes(duration == UserSessionDurationType.PublicComputer ? PublicSessionDuration : ExtendedSessionDuration),
UserID = user.UserID,
RenewalToken = Guid.NewGuid()
};
var history = new AuthenticationHistory
{
CreatedDate = session.CreatedDate,
IPAddress = ipAddress,
IsAuthenticated = true,
UserName = name,
SessionID = session.SessionID,
UserSession = session
};
using (var scope = new System.Transactions.TransactionScope())
{
if (allowUpdateHash && (hasher.IsObsolete || user.PasswordHashUpdatedDate < DateTime.UtcNow.AddMonths(-1)))
{
//update hashes on regular basis, keeps the iterations in latest range for current users, and with a 'current' hash provider.
hasher = HashManager.SelectProvider();
salt.PasswordSalt = hasher.GetSalt();
salt.HashGroup = new Random(DateTime.Now.Second).Next(HashGroupMinimum, HashGroupMaximum);
salt.HashName = hasher.Name;
user.PasswordHash = hasher.Hash(salt.PasswordSalt, password, salt.HashGroup + BaseHashIterations);
user.PasswordHashUpdatedDate = DateTime.UtcNow;
//starts as a lightweight transaction
SaveUser(user);
//enlists in a full distributed transaction if users and salts have different connection strings
SaveUserSalt(salt);
}
//either continues distributed transaction if applicable,
// or creates a new lightweight transaction for these two commands
SaveUserSession(session);
InsertUserHistory(history);
scope.Complete();
}
return(new UserIdentity(history, Name));
}