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The Security Perimeter
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The discussion to this point has not mentioned the specific technology used to enforce operational and organizational security or a description of the various components that constitute the organization s security perimeter If the average administrator were asked to draw a diagram depicting the various components of her network, the diagram would probably look something like Figure 2-1 This diagram includes the major components typically found in a network A connection to the Internet generally has some sort of protection attached to it such as a
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2: Operational Organizational Security
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Figure 2-1 Basic diagram of an organization s network
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PART I
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firewall An intrusion detection system (IDS), also often a part of the security perimeter for the organization, can be on the inside of the firewall, or the outside, or it may in fact be on both sides The specific location depends on the company and what it seeks to protect against (that is, insider threats or external threats) Beyond this security perimeter is the corporate LAN Figure 2-1 is obviously a simple depiction an actual network can have numerous subnets and extranets but the basic components are present Unfortunately, if this were the diagram provided by the administrator to show the organization s basic network structure, the administrator would have missed a very important component A more astute administrator would provide a diagram more like Figure 2-2 This diagram includes the other important network found in every organization, the telephone network that is connected to the public switched telephone network (PSTN), otherwise known as the phone company The organization may or may not
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Figure 2-2 A more complete diagram of an organization s network
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have any authorized modems, but the savvy administrator would realize that because the potential exists for unauthorized modems, the telephone network must be included as a possible source of access for the network When considering the policies, procedures, and guidelines needed to implement security for the organization, both networks need to be considered While Figure 2-2 provides a more comprehensive view of the various components that need to be protected, it is still incomplete Most experts will agree that the biggest danger to any organization does not come from external attacks but rather from the insider a disgruntled employee or somebody else who has physical access to the facility Given physical access to an office, a knowledgeable attacker will quickly be able to find the information he needs to gain access to the organization s computer systems and network Consequently, every organization also needs security policies, procedures, and guidelines that cover physical security, and every security administrator should be concerned with these as well While physical security (which can include such things as locks, cameras, guards and entry points, alarm systems, and physical barriers) will probably not fall under the purview of the security administrator, the operational state of the organization s physical security measures is just as important as many of the other network-centric measures
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Logical Access Controls
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Access control lists (ACLs) are as important to logical access controls as they are to the control of physical access to the organization and its resources An ACL is simply a list of the individuals (or groups) that are granted access to a specific resource It can also include the type of access they have (that is, what actions they can perform on or with the resource) Logical access controls refer to those mechanisms that are used to control who may gain electronic access (access to data or resources from a computer system or network as opposed to physical access to the system itself) to the organization s computer systems and networks Before setting the system s access controls, you must establish the security policies that the settings will be based upon
Access Control Policies
As mentioned, policies are statements of what the organization wants to accomplish The organization needs to identify goals and intentions for many different aspects of security Each aspect will have associated policies and procedures
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