protected override void SaveUserSession(UserSession session)
{
throw new NotImplementedException();
}
/// <summary> /// Saves a user session, insert or update. /// </summary> /// <param name="session"></param> protected abstract void SaveUserSession(UserSession session);
protected override AuthenticationHistory GetSessionAuthenticationHistory(UserSession session)
{
throw new NotImplementedException();
}
/// <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> /// Gets the authentication history for a specific session. /// </summary> /// <param name="session"></param> /// <returns></returns> protected abstract AuthenticationHistory GetSessionAuthenticationHistory(UserSession session);
/// <summary>
/// Saves a user session, insert or update.
/// </summary>
/// <param name="session"></param>
protected override void SaveUserSession(UserSession session)
{
using (var cn = new SqlConnection(ConnectionStringAudit))
{
cn.Open();
using (var cmd = new SqlCommand())
{
cmd.Connection = cn;
cmd.CommandType = System.Data.CommandType.Text;
if (session.SessionID == 0)
{
cmd.CommandText = @"insert into Security.UserSession
(UserID, RenewalToken, ExpirationDate)
Values (@UserID, @RenewalToken, @ExpirationDate)";
cmd.Parameters.AddWithValue("UserID", session.UserID);
cmd.Parameters.AddWithValue("RenewalToken", session.RenewalToken);
cmd.Parameters.AddWithValue("ExpirationDate", session.ExpirationDate);
}
else
{
cmd.CommandText = @"update Security.UserSession
set ExpirationDate = @ExpirationDate,
RenewedDate = @RenewedDate
where SessionID = @SessionID";
cmd.Parameters.AddWithValue("ExpirationDate", session.ExpirationDate);
cmd.Parameters.AddWithValue("RenewedDate", session.RenewedDate);
cmd.Parameters.AddWithValue("SessionID", session.SessionID);
}
cmd.ExecuteNonQuery();
}
}
}
/// <summary>
/// Gets the authentication history for a specific session.
/// </summary>
/// <param name="session"></param>
/// <returns></returns>
protected override AuthenticationHistory GetSessionAuthenticationHistory(UserSession session)
{
using (var cn = new SqlConnection(ConnectionStringAudit))
{
cn.Open();
using (var cmd = new SqlCommand())
{
cmd.Connection = cn;
cmd.CommandType = System.Data.CommandType.Text;
cmd.CommandText = @"Select top 1 RecordID, UserName, IPAddress, CreatedDate, IsAuthenticated, SessionID
from Security.AuthenticationHistory
where SessionID = @SessionID
and IsAuthenticated == 1
order by CreatedDate desc";
cmd.Parameters.AddWithValue("SessionID", session.SessionID);
using (var reader = cmd.ExecuteReader())
{
if (reader.Read())
{
return new AuthenticationHistory
{
RecordID = reader.GetInt32("RecordID", 0),
UserName = reader.GetString("UserName", ""),
IPAddress = reader.GetString("IPAddress", ""),
CreatedDate = reader.GetUTCDateTime("CreatedDate", DateTime.MinValue),
IsAuthenticated = reader.GetBoolean("IsAuthenticated", false),
SessionID = session.SessionID,
UserSession = session
};
}
}
}
}
return null;
}
/// <summary> /// Gets the authentication history for a specific session. /// </summary> /// <param name="session"></param> /// <returns></returns> protected abstract AuthenticationHistory GetSessionAuthenticationHistory(UserSession session);
/// <summary> /// Saves a user session, insert or update. /// </summary> /// <param name="session"></param> protected abstract void SaveUserSession(UserSession session);
/// <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));
}
