1 / 5

Authentication and authorization

Computer System Security and Management Access Control. Authentication and authorization Access control consists of two steps, authentication and authorization. Subject. Do operation. Referencemonitor. Object. Source Makes an access request. Request. Resources memory printers

edan-mccoy
Download Presentation

Authentication and authorization

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Computer System Security and Management Access Control Authentication and authorization Access control consists of two steps, authentication and authorization. Subject Do operation Referencemonitor Object Source Makes an access request Request Resources memory printers files nodes Guard

  2. Computer System Security and Management Access Control • Access operations • There is two access modes: • Observe – look at the contents of an objectExample application level: select * from table (sql) or SNMP get operation • Alter – change the content of an objectExample application level: delete from table (sql) or SNMP set operation • In Linux there is three different access attributes: • Read (r), Write, (w) and execute (e). • And three different access groups: Owner, groups and others • For example: -rw-r--r-- 1 root root 221 Dec 18 2012 hosts • The owner of the file hosts, root, has read and write access. • Groups has read access and others has read access

  3. Computer System Security and Management Access Control • Administrative access rights • Meaning of read, write and execute operations: • read – reading from file and list directories contents • write – writing to file and create or rename a file in the directory • execute – executing a (program) file and search the directory • Operations for manipulating a subject’s access rights is called grant and revoke when the subject’s rights are modified by some other party. Example root changes the ownership of a file: chown nobody:nobody /tmp/script.sh • When the owner changes his own access right operation is called assert and deny.

  4. Computer System Security and Management Access Control Access Control Lists An ACL corresponds to a column of the access control matrix and states who may access a given object. ACL for process.c Bill: read, write; ACL for lists.c Alice: execute; Bill: write; Linux access control model is based on simple ACLs. Active Directory, AD, in Windows server uses ACL. AD uses GPO, Group Policy, to grant access to object like applications or printers to groups.

  5. Computer System Security and Management Access Control • Intermediate controls • Group and negative permissions: Group1 in AD has access to a network disk meanwhile Group2 hasn’t. • Privileges: root access in Linux. To grant root access in Mac os X we can use the command sudo, but we need a password. • Role-Based Access Control: RBAC. In Linux root has the highest privilege or admin user in windows.

More Related