Windows authentication uses a series of encrypted messages to authenticate users in SQL Server. With Windows authentication, users are already logged onto Windows and do not have to log on separately to SQL Server.
The following SqlConnection. ConnectionString specifies Windows authentication without requiring users to provide a user name or password. Logins are distinct from database users. You must map logins or Windows groups to database users or roles in a separate operation. You then grant permissions to users or roles to access database objects. A local Windows user account or trusted domain account.
Windows group. Granting access to a Windows group grants access to all Windows user logins that are members of the group. SQL server creates that account as a login in the master database. This account connects using SQL Server authentication user name and password. Only one of these accounts can exist. One Azure Active Directory account, either an individual or security group account, can also be configured as an administrator.
The Server admin and Azure AD admin accounts have the following characteristics:. Once the login exists, you can create users in the individual databases within the serverless SQL pool endpoint and grant required permissions to these users. To create a use, you can use the following syntax:. Only the latest tools provide all the features and capabilities. When using an open port in the server-level firewall, administrators can connect to any SQL Database.
One of these administrative roles is the dbmanager role. Members of this role can create new databases. To use this role, you create a user in the master database and then add the user to the dbmanager database role. To create a database, the user must be a user based on a SQL Server login in the master database or contained database user based on an Azure Active Directory user. Sample statement:. Use a strong password when creating a login or contained database user.
For more information, see Strong Passwords. To improve performance, logins server-level principals are temporarily cached at the database level. Sample statements:. The dbmanager is a database role in master database so you can only add a database user to the dbmanager role. You cannot add a server-level login to database-level role. Download Microsoft Edge More info.
Contents Exit focus mode. Is this page helpful? Please rate your experience Yes No. Any additional feedback? Caution The following example uses an extended stored procedure to modify the server registry.
Note The permissions required to change the authentication mode are sysadmin or Control Server. Submit and view feedback for This product This page. It can help SQL Server to support web applications where users create their own identities. This connection pooling is not a good practice. In this case, you can create separate logins for each user and connect to the database using their credentials. By default, if you implement SQL Database in the cloud, i.
Later, if required, you can configure AD-based authentication. You can use it to connect from cross-operating systems such as Linux and macOS. An overview of Windows authentication In Windows authentication, the user should first authenticate himself within Active Directory.
Advantages of Windows authentication Windows authentication is a secure way of connecting to SQL Server, and it uses the tokens and SPNs for authentication purposes using the Kerberos authentication protocol. Therefore, it does not send passwords across the network, and it safeguards stealing passwords across the network. It uses Kerberos security protocol, and you can implement password policies such as complex passwords, account lockouts and password expiration.
This password policy can be implemented at the organization level across all servers. Therefore, you can control user security policies at the organization level instead of at the individual login level like with SQL Server authentication.
Windows authentication enables the separation of duties. Active Directory helps to create Windows groups. The AD team can add multiple people that require equal access in an AD group. Later, you can add the group in the SQL instance and provide permissions at the group level. Therefore, if a new person joins, once he is part of the AD group, database access is automatically granted across the server where this AD group exists.
Similarly, once a user moves from the organization and their ID is removed from these AD groups, they can no longer access the database. DBAs do not have control over the AD logins and groups. You do not get a notification if a user is added or removed from the AD groups. About the Author Rajendra Gupta.
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