Soft Resource Sharing in Client-Server Networks: Access Control & Windows Permissions, Slides of Computer Networks

Download Soft Resource Sharing in Client-Server Networks: Access Control & Windows Permissions and more Slides Computer Networks in PDF only on Docsity! Fundamentals of Soft CATO pe ey C) Chapter Objectives • Present an overview of the sharing mechanism in client-server networks • Explain the different types of access controls that could be imposed on resources • Describe the permissions that could be assigned to users for using resources docsity.com © N. Ganesan, All rights reserved. MODULE Overview of Windows NT Client- Server Sharing docsity.com Module Objectives • Basic client-server sharing • Resource administrator and the user • Resources, resource administrator and users • Case example for demonstration • Client-server sharing: The two-step process • Resource classification for sharing • Overview of sharing of different resource types docsity.com Basic Client-Server Sharing • As in peer-to-peer sharing, the act of sharing usually involves the following entities: – Resource Administrator – Network User • As the name implies, sharing is a two step process docsity.com Case Example US Mexico Canada Tariff Resource (Directory to be shared). California Administrator Nevada Texas docsity.com A Note on Resource Administrator • A resource holder need not always be the network Administrator • A Print Operator can place a printer for sharing and subsequently remove it from sharing as well • In Windows terminology, a resource holder is known as the Owner Creator docsity.com Client-Server Sharing: The Two- Step Process • Administrator – Places the resource on the network – Gives users the appropriate privileges to use the resource • Network User – Gains access to the resource – Uses the resource in compliance with the privileges given docsity.com Sharing and Resource Types Soft resource on the network Share as any local logical resource Hard resource (device) on the network Install as a local logical device Share the logical device docsity.com v END OF MODULE docsity.com © N. Ganesan, All rights reserved. MODULE Access Control in the NT Client- Server Environment docsity.com Effective Access to a Resource Resource User Permission docsity.com Permission • Permission to use a resource such as a directory by one or more identified users • Example: – User California is given Read permission to access the directory Tariff • Comparison with peer-to-peer control – Network users are all given Read access to the directory Tariff • Share level control docsity.com Basic Permissions for Files and Directories • Read (R) • Write(W) • Execute (X) • Delete (D) • Change Permission (P) • Take Ownership (O) docsity.com Change Permission and Take Ownership • Change Permission – Change the permission on the directory and file • Take Ownership – Take ownership of the file and directory docsity.com Expression of Permission: An Example for User California California (RWX) (RX) Directory File docsity.com Checking User California’s Permission on the Directory Tariff docsity.com Module Objectives • File system and Windows NT permissions • Newer file system in Windows 9X • File and directory permissions • Security concerns with FAT • Sample file system configurations in a server • A variation of the FAT-based configuration • Predefined permissions in NTFS docsity.com File Systems and Windows NT Permissions • Assignment of directory and file permission depends on the file system • FAT file system – Limited security • NTFS – More extensive security and assignment of permissions docsity.com The FAT File System • Known as FAT32 • The older file system is known as FAT16 • Supported in Windows 95 OSR2, Windows 98 and Windows Me • NT 4.0 does not offer the support for accessing disks formatted under FAT32 • Windows 2000 does offer support for FAT32 docsity.com Sample Server Configurations NTFS NTFS FAT Windows 9x/ NT OS CD Copy docsity.com A Variation of the FAT-Based Configuration FAT FAT NT Windows 95 External Security docsity.com NTFS Predefined Permissions • None (None) (None) • List (RX) (Not Specified) • Read (RX) (RX) • Add (WX) (Not Specified) • Add & Read (RWX) (RX) • Change (RWXD) (RWXD) • Full Control (All) (All) docsity.com