IMembershipProvider.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / Security / IMembershipProvider.cs / 1 / IMembershipProvider.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.Security { 
    using  System.Web; 
    using  System.Security.Principal;
    using  System.Collections.Specialized; 
    using  System.Web.Configuration;
    using  System.Security.Permissions;
    using  System.Globalization;
    using  System.Security.Cryptography; 
    using  System.Runtime.Serialization;
    using  System.Configuration.Provider; 
    using  System.Text; 

 
    /// 
    ///    [To be supplied.]
    /// 
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    public abstract class MembershipProvider : ProviderBase 
    { 
        private const int SALT_SIZE_IN_BYTES = 16;
 
        //
        // Property Section
        //
 

        // Public properties 
        public abstract bool EnablePasswordRetrieval { get; } 

        public abstract bool EnablePasswordReset { get; } 

        public abstract bool RequiresQuestionAndAnswer { get; }

        public abstract string ApplicationName { get; set; } 

        public abstract int MaxInvalidPasswordAttempts { get; } 
 
        public abstract int PasswordAttemptWindow { get; }
 
        public abstract bool RequiresUniqueEmail { get; }

        public abstract MembershipPasswordFormat PasswordFormat { get; }
 
        public abstract int MinRequiredPasswordLength { get; }
 
        public abstract int MinRequiredNonAlphanumericCharacters { get; } 

        public abstract string PasswordStrengthRegularExpression { get; } 

        //
        // Method Section
        // 

 
        public abstract MembershipUser CreateUser( string username, 
                                                   string password,
                                                   string email, 
                                                   string passwordQuestion,
                                                   string passwordAnswer,
                                                   bool   isApproved,
                                                   object providerUserKey, 
                                                   out    MembershipCreateStatus status );
 
 
        public abstract bool ChangePasswordQuestionAndAnswer(string username, string password, string newPasswordQuestion, string newPasswordAnswer);
 
        public abstract string GetPassword(string username, string answer);

        public abstract bool ChangePassword(string username, string oldPassword, string newPassword);
 
        public abstract string ResetPassword(string username, string answer);
 
        public abstract void UpdateUser(MembershipUser user); 

        public abstract bool ValidateUser(string username, string password); 


        public abstract bool UnlockUser( string userName );
 
        public abstract MembershipUser GetUser( object providerUserKey, bool userIsOnline );
 
        public abstract MembershipUser GetUser(string username, bool userIsOnline); 

        // GetUser() can throw 1 type of exception: 
        // 1. ArgumentException is thrown if:
        //    A. Username is null, is empty, contains commas, or is longer than 256 characters
        internal MembershipUser GetUser(string username, bool userIsOnline, bool throwOnError) {
            MembershipUser user = null; 

            try { 
                user = GetUser(username, userIsOnline); 
            }
            catch (ArgumentException) { 
                if (throwOnError) throw;
            }

            return user; 
        }
 
        public abstract string GetUserNameByEmail(string email); 

        public abstract bool DeleteUser(string username, bool deleteAllRelatedData); 


        public abstract MembershipUserCollection GetAllUsers(int pageIndex, int pageSize, out int totalRecords);
 

        public abstract int GetNumberOfUsersOnline(); 
 

        public abstract MembershipUserCollection FindUsersByName(string usernameToMatch, int pageIndex, int pageSize, out int totalRecords); 

        public abstract MembershipUserCollection FindUsersByEmail(string emailToMatch, int pageIndex, int pageSize, out int totalRecords);

        protected virtual byte[] EncryptPassword( byte[] password ) 
        {
            if (MachineKeySection.IsDecryptionKeyAutogenerated) 
                throw new ProviderException(SR.GetString(SR.Can_not_use_encrypted_passwords_with_autogen_keys)); 
            return MachineKeySection.EncryptOrDecryptData(true, password, null, 0, password.Length);
        } 

        protected virtual byte[] DecryptPassword( byte[] encodedPassword )
        {
            if (MachineKeySection.IsDecryptionKeyAutogenerated) 
                throw new ProviderException(SR.GetString(SR.Can_not_use_encrypted_passwords_with_autogen_keys));
            return MachineKeySection.EncryptOrDecryptData(false, encodedPassword, null, 0, encodedPassword.Length); 
        } 

        internal string EncodePassword(string pass, int passwordFormat, string salt) 
        {
            if (passwordFormat == 0) // MembershipPasswordFormat.Clear
                return pass;
 
            byte[] bIn = Encoding.Unicode.GetBytes(pass);
            byte[] bSalt = Convert.FromBase64String(salt); 
            byte[] bAll = new byte[bSalt.Length + bIn.Length]; 
            byte[] bRet = null;
 
            Buffer.BlockCopy(bSalt, 0, bAll, 0, bSalt.Length);
            Buffer.BlockCopy(bIn, 0, bAll, bSalt.Length, bIn.Length);
            if (passwordFormat == 1)
            { // MembershipPasswordFormat.Hashed 
#if !FEATURE_PAL // FEATURE_PAL does not enable cryptography
                HashAlgorithm s = HashAlgorithm.Create( Membership.HashAlgorithmType ); 
 
                // If the hash algorithm is null (and came from config), throw a config exception
                if (s == null) { 
                    if ( Membership.IsHashAlgorithmFromMembershipConfig ) {
                        MembershipSection settings = RuntimeConfig.GetAppConfig().Membership;
                        settings.ThrowHashAlgorithmException();
                    } 
                }
                bRet = s.ComputeHash(bAll); 
#endif // !FEATURE_PAL 
            } else
            { 
                bRet = EncryptPassword( bAll );
            }

            return Convert.ToBase64String(bRet); 
        }
 
        internal string UnEncodePassword(string pass, int passwordFormat) 
        {
            switch (passwordFormat) 
            {
                case 0: // MembershipPasswordFormat.Clear:
                    return pass;
                case 1: // MembershipPasswordFormat.Hashed: 
                    throw new ProviderException(SR.GetString(SR.Provider_can_not_decode_hashed_password));
                default: 
                    byte[] bIn = Convert.FromBase64String(pass); 
                    byte[] bRet = DecryptPassword( bIn );
                    if (bRet == null) 
                        return null;
                    return Encoding.Unicode.GetString(bRet, SALT_SIZE_IN_BYTES, bRet.Length - SALT_SIZE_IN_BYTES);
            }
        } 

        internal string GenerateSalt() 
        { 
            byte[] buf = new byte[SALT_SIZE_IN_BYTES];
            (new RNGCryptoServiceProvider()).GetBytes(buf); 
            return Convert.ToBase64String(buf);
        }

        // 
        // Event Section
        // 
 
        public event MembershipValidatePasswordEventHandler ValidatingPassword
        { 
            add
            {
                _EventHandler += value;
            } 
            remove
            { 
                _EventHandler -= value; 
            }
        } 

        protected virtual void OnValidatingPassword( ValidatePasswordEventArgs e )
        {
            if( _EventHandler != null ) 
            {
                _EventHandler( this, e ); 
            } 
        }
 
        private MembershipValidatePasswordEventHandler _EventHandler;
    }
}

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