Transcript lesson14

Logins, Roles and Credentials
Lesson 14
Skills Matrix
SQL Server Logins
• A SQL Server key—a login—gives your users
access to SQL Server as a whole, not to the
resources (such as databases) inside.
• If you’re a member of the sysadmin or
securityadmin fixed server, you can create
one of two types of logins:
– Standard logins
– Windows logins
Standard Login
• Only clients with a Windows account can
make trusted connections to SQL Server
(where SQL Server trusts Windows to
validate the user’s password).
• If the user (such as a Macintosh or Linux
client) for whom you’re creating a login can’t
make a trusted connection, you must create
a standard login for him or her.
Windows Login
• A Windows login can be mapped to one of
the following:
– A single user
– A Windows group that an administrator has
created
– A Windows built-in group (for example,
Administrators)
Items Common to All Logins
• When users first log in to SQL Server, they connect
to the default database.
– In all types of logins, you can grant database
access at create time.
– If you create a Windows login using
sp_grantlogin, you can’t set the default
database or language.
– In addition, you can add users to a fixed server
role at the time you create them
•You do this on the Server Roles tab in SQL Server
Management Studio.
Database User Accounts
• In much the same way, you need to give users
access to databases once they have logged in
to SQL Server.
• You do so by creating database user accounts
and then assigning permissions to those user
accounts.
• Once this process completes, your SQL Server
users also have more than one key: one for the
front door (the login) and one for each file
cabinet (database) to which they need access.
Database User Accounts
• You may have noticed that two user
accounts already exist in your databases
when they are first created:
– DBO
– Guest
• Members of the sysadmin fixed server role
automatically become the database owner
(DBO) user in every database on the system.
Roles
• Roles are analogous to groups in the
operating system.
• A user can be added to a role to inherit the
permissions of the role.
• In this manner you can simplify your
administrative load: create a role and design
the necessary security protocol.
• Users can then be added or removed easily
maintaining your security plan.
Fixed Server Roles
• Bulkadmin
• Dbcreator
• Diskadmin
• Processadmin
• Public
• Securityadmin
• Serveradmin
• Setupadmin
• sysadmin:
SysAdmin
• Members of the sysadmin role have the
authority to perform any task in SQL Server.
• SQL Server automatically makes operating
system BUILTIN\Administrators a member of
the sysadmin server role, giving SQL Server
administrative rights to all of your Windows
administrators.
Database Roles
• Although granting permissions to single
users proves useful from time to time, it’s
better, faster, and easier to apply
permissions via roles.
• You have three types of database roles to
consider:
– Fixed
– Custom
– Application
Fixed Database Roles
• Fixed database roles have permissions
already applied; that is, you need only add
users to these roles and the users inherit the
associated permissions
Fixed Database Roles
• db_accessadmin
• db_backupoperator
• db_datareader
• db_datawriter
• db_ddladmin
• db_denydatareader
• db_denydatawriter
• db_owner
• db_securityadmin
• public
Custom Database Roles
• Fixed database roles cover many—but not all—of
the situations that require permissions to be
assigned to users.
• When you create this new role, you assign
permissions to it and then assign users to the role
– The users inherit whatever permissions you
assign to that role.
– You can make your custom database roles
members of other database roles. This refers to
nesting roles.
Application Roles
• The application role—grants you a great deal of
authority over which applications can be used to
work with the data in your databases.
• To enable the application role, the application
executes the sp_setapprole stored procedure
(which writes to the application at design time).
• Once the application role has been enabled, SQL
Server no longer sees users as themselves.
– it sees them as the application and grants them
application role permissions.
MSDB Roles
• Additional roles of value are found in the MSDB
system database.
– DatabaseMailUserRole
– db_ssisadmin
– db_ssisltduser
– db_ssisoperator
– dc_admin
– dc_operator
– dc_proxy
– PolicyAdministratorRole
MSDB Roles
– RSExecRole
– ServerGroupAdministratorRole
– ServerGroupReaderRole
– SQLAgentOperatorRole
– SQLAgentReaderRole
– SQLAgentUserRole
– TargetServersRole
Ownership Chain
• In the physical world, people own objects, with which they
can do as they please, including lending or giving them to
others.
• SQL Server understands this concept of ownership. When
users create an object, they own that object and can do
whatever they want with it.
• This works well, until you consider ownership chains.
• An object on loan still belongs to the owner; the person
who borrows it must ask the owner for permission before
allowing another person to use it.
– Acting without such permission describes a broken
ownership chain.
Credentials
• A credential record contains the
authentication information (credentials)
required to connect to a resource outside
SQL Server.
– SQL Server uses this information internally.
– Most credentials contain a Windows user
name and password.
Summary
• This lesson examined the processes of
creating and managing logins, groups, and
users.
• You learned how to create a Standard login
and a Windows user or group login using SQL
Server Management Studio or T-SQL, and you
learned when to use each type.
• If you have a well-designed security plan that
incorporates growth, managing your user base
can be a nearly painless task.
Summary
• To limit administrative access to SQL Server at
the server level, you learned you can add
users to a fixed server role.
• To limit access in a specific database, you can
add users to a database role; and if one of the
fixed database roles isn’t to your liking, you
can create your own.
• You can even go as far as to limit access to
specific applications by creating an
application role.
Summary
• To limit administrative access to SQL Server at
the server level, you learned you can add
users to a fixed server role.
• To limit access in a specific database, you can
add users to a database role; and if one of the
fixed database roles isn’t to your liking, you
can create your own.
• You can even go as far as to limit access to
specific applications by creating an
application role.
Summary
• You then learned about chains of ownership. These are
created when you grant permissions to others on objects
you own.
• Adding more users who create dependent objects creates
broken ownership chains, which can become complex and
tricky to manage.
• You learned how to predict the permissions available to
users at different locations within these ownership chains.
• You also learned that to avoid the broken ownership chains,
you can add your users to either the db_owner database
role or the db_ddladmin database role and have your users
create objects as the DBO.
Summary
• You can grant permissions to database users,
as well as database roles.
• When you add users to a role, they inherit the
permissions of the role, including the public role
(to which everyone belongs).
• The only exception occurs when a user has
been denied permission, because Deny takes
precedence over any other right, no matter the
level at which the permission was granted.
Summary
• And finally you learned you can access
resources outside of SQL Server by creating
credentials.
Summary for Certification Examination
• Understand roles. Be familiar with the various fixed
server and database roles and what they can be
used for in the real world.
• You also need to know when to create a custom
database role instead of using the built-in roles.
• A good example happens when you need to allow
users to insert, update, and select on a table but
not to delete.
• No built-in role allows this, so you would need a
custom role.