Access Tokens - Win32 Programmer's Reference

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Access Tokens

When a user logs on, the system verifies the user's password by comparing it with information stored in a security database. If the password is authenticated, the system produces an access token and attaches it to the user's process. This access token identifies the user in all subsequent interactions with securable objects and contains the following information about a process:

The user's SID
Group SIDs
Privileges
An owner SID
The SID for the primary group
The default discretionary access-control list (ACL)
The source of the access token
Whether the token is a primary or impersonation token
Current impersonation levels
Other statistics

Every process has a primary token that determines the security context in which the process interacts with securable objects. By default, a thread runs in the security context of its process. However, a thread can use impersonation to run in a different security context. In this case, the thread has an impersonation token that determines the security context for most of the thread's actions. For more information, see Impersonation.

For more information about privileges, see Privileges. For more information about security identifiers (SIDs), see Security Identifiers (SIDs). For more information about discretionary ACLs, see Access-control Lists (ACLs). For more information about the components of an access token, see the following token structures and enumerated types.

Structure or enumeration type	Specifies
TOKEN_CONTROL	Information useful in identifying an access token.
TOKEN_DEFAULT_DACL	The default discretionary ACL for an access token.
TOKEN_GROUPS	Specifies the SIDs of the access token's groups and whether any privileges are enabled.
TOKEN_INFORMATION_CLASS	Information being set in or retrieved from an access token.
TOKEN_OWNER	The SID of an access token's owner.
TOKEN_PRIMARY_GROUP	The SID of the access token's primary group.
TOKEN_PRIVILEGES	The privileges associated with an access token and whether the privileges are enabled.
TOKEN_SOURCE	The source of an access token.
TOKEN_STATISTICS	Statistics associated with an access token.
TOKEN_TYPE	Whether an access token is being used as an impersonation token.
TOKEN_USER	The SID of an access token's user.

You can use the following functions to manipulate access tokens.

Following are the functions an application can use to manipulate access tokens.

Function	Description
AdjustTokenGroups	Changes the group information in an access token.
AdjustTokenPrivileges	Changes the privileges in an access token.
DuplicateToken	Creates a new impersonation token that duplicates an existing token.
DuplicateTokenEx	Creates a new primary token or impersonation token that duplicates an existing token.
GetTokenInformation	Retrieves information about a token.
OpenProcessToken	Retrieves the handle of the access token for a process.
OpenThreadToken	Retrieves the handle of the access token for a thread.
SetThreadToken	Assigns or removes an impersonation token for a thread.
SetTokenInformation	Changes a token's owner, primary group, or default discretionary ACL.

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