Authorization is the function of specifying access rights/privileges to resources, which is related to general information security
and computer security
, and to access control
in particular. More formally, "to authorize" is to define an access policy. For example, human resources
staff are normally authorized to access employee records and this policy is often formalized as access control rules in a computer system. During operation, the system uses the access control rules to decide whether access requests from (authenticated
) consumers shall be approved (granted) or disapproved (rejected).
Resources include individual files or an item's data
, computer program
s, computer device
s and functionality provided by computer application
s. Examples of consumers are computer users, computer software
and other hardware
on the computer.
Access control in computer
systems and networks
rely on access policies
. The access control process can be divided into the following phases: policy definition phase where access is authorized, and policy enforcement phase where access requests are approved or disapproved. Authorization is the function of the policy definition phase which precedes the policy enforcement phase where access requests are approved or disapproved based on the previously defined authorizations.
Most modern, multi-user operating systems include role-based access control
(RBAC) and thereby rely on authorization. Access control also uses authentication
to verify the identity
of consumers. When a consumer tries to access a resource, the access control process checks that the consumer has been authorized to use that resource. Authorization is the responsibility of an authority, such as a department manager, within the application domain, but is often delegated to a custodian such as a system administrator. Authorizations are expressed as access policies in some types of "policy definition application", e.g. in the form of an access control list
or a capability
, or a policy administration point e.g. XACML
. On the basis of the "principle of least privilege
": consumers should only be authorized to access whatever they need to do their jobs. Older and single user operating systems often had weak or non-existent authentication and access control systems.
"Anonymous consumers" or "guests", are consumers that have not been required to authenticate. They often have limited authorization. On a distributed system, it is often desirable to grant access without requiring a unique identity. Familiar examples of access tokens
include keys, certificates and tickets: they grant access without proving identity.
Trusted consumers are often authorized for unrestricted access to resources on a system, but must be verified so that the access control system can make the access approval decision. "Partially trusted" and guests will often have restricted authorization in order to protect resources against improper access and usage. The access policy in some operating systems, by default, grant all consumers full access to all resources. Others do the opposite, insisting that the administrator explicitly authorizes a consumer to use each resource.
Even when access is controlled through a combination of authentication and access control list
s, the problems of maintaining the authorization data is not trivial, and often represents as much administrative burden as managing authentication credentials. It is often necessary to change or remove a user's authorization: this is done by changing or deleting the corresponding access rules on the system. Using atomic authorization
is an alternative to per-system authorization management, where a trusted third party
securely distributes authorization information.
In public policy
, authorization is a feature of trusted systems used for security
or social control
, an authorization
is a hold placed on a customer's account when a purchase is made using a debit card
or credit card
, sometimes public lectures and other freely available texts are published without the approval of the author
. These are called unauthorized texts. An example is the 2002 '' 'The Theory of Everything: The Origin and Fate of the Universe' '', which was collected from Stephen Hawking
's lectures and published without his permission as per copyright law.
* Access control
* Authorization hold
* Authorization OSID
* Kerberos (protocol)
* Multi-party authorization
* OpenID Connect
* Usability of web authentication systems
Category:Computer access control