SRM (SECURITY REFERENCE MONITOR)

3) SRM (Security Reference Monitor)

• The Security Reference Monitor is a security architecture component
that is used to control user requests to access objects in the system.
The SRM enforces the access validation and audit generation. Windows
NT forbids the direct access to objects. Any access to an object must
first be validated by the SRM. For example, if a user wants to access a
specific file the SRM will be used to validate the request. The Security
Reference Monitor enforces access validation and audit generation
policy.

• The reference monitor verifies the nature of the request against a table
of allowable access types for each process on the system. For example,
Windows 3.x and 9x operating systems were not built with a reference
monitor, whereas the Windows NT line, which also includes Windows
2000 and Windows XP, was designed with an entirely different
architecture and does contain a reference monitor.


Windows User Account Architecture

• User account passwords are contained in the SAM in the
Hexadecimal Format called Hashes.



• Once the Passwords converted in Hashes, you cannot
convert back to the Clear Text.

SAM (SECURITY ACCOUNT MANAGER)

2) SAM (Security Account Manager)


• The Security Accounts Manager is a database in the Windows
operating system (OS) that contains user names and passwords.
SAM is part of the registry and can be found on the hard disk.

• This service is responsible for making the connection to the SAMdatabase
(Contains available user-accounts and groups). The SAMdatabase
can either be placed in the local registry or in the Active
Directory (If available). When the service has made the connection
it announces to the system that the SAM-database is available, so
other services can start accessing the SAM-database.

SAM (Security Account Manager)

• In the SAM, each user account can be assigned a Windows password
which is in encrypted form. If someone attempts to log on to the
system and the user name and associated passwords match an entry in
the SAM, a sequence of events takes place ultimately allowing that
person access to the system. If the user name or passwords do not
properly match any entry in the SAM, an error message is returned
requesting that the information be entered again.

• When you make a New User Account with a Password, it gets stored in
the SAM File.

• Windows Security Files are located at

“C:\Windows\System32\Config\SAM”

• The moment operating system starts, the SAM file becomes
inaccessible

WINDOWS SECURITY ARCHITECTURE

There are three components of Windows Security:

• LSA (Local Security Authority)
• SAM (Security Account Manager)
• SRM (Security Reference Monitor)


1) LSA (Local Security Authority)

• LSA is the Central Part of NT Security. It is also known as Security
Subsystem. The Local Security Authority or LSA is a key component of
the logon process in both Windows NT and Windows 2000. In Windows
2000, the LSA is responsible for validating users for both local and
remote logons. The LSA also maintains the local security policy.


• During the local logon to a machine, a person enters his name and
password to the logon dialog. This information is passed to the LSA,
which then calls the appropriate authentication package. The password
is sent in a non-reversible secret key format using a one-way hash
function. The LSA then queries the SAM database for the User’s
account information. If the key provided matches the one in the SAM,
the SAM returns the users SID and the SIDs of any groups the user
belongs to. The LSA then uses these SIDs to generate the security
access token.

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