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In this chapter, you have examined the basic procedures for managing users and groups on a Solaris system. Since all processes and threads are executed with a real or effective user and group ID, it s important for you to understand how to manage these entities effectively. SMC is a powerful and versatile tool for managing multiple systems from a single interface where different systems can be customized to administer their own local applications as well as a set of common applications. This flexibility gives SMC a number of advantages over the admintool, or command-line administration. For more information on SMC, read the administrator s guide on http://docs.sun.com.
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hapter 9 examined username and password authentication, in the context of system and network security, as a built-in feature of Solaris. However, in cross-platform environments, gaining access to more flexible and distributed authentication is necessary for scalability. In this chapter, the basic concepts of Sun s version of MIT Kerberos (known as the Sun Enterprise Authentication Mechanism, or SEAM), are introduced for distributed authentication, followed by a review of the Pluggable Authentication Module (PAM) that allows system administrators to specify the authentication that they want to use. PAM allows drop-in replacement for existing authentication systems without having to reconfigure services or applications that require authentication.
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The following concepts provide a foundation for implementing pluggable and distributed authentication services in Solaris. Note that related hardware authentication issues, such as the use of smart cards, are beyond the scope of this chapter. However, readers interested in the use of card-based credentials should read the Solaris Smartcard Administration Guide at http://docs.sun.com.
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Distributed services and applications require distributed authentication. While singlepurpose tools like the secure shell (SSH) can be used as tools for remote access between a single client and multiple servers, maintaining local databases of keys on every client machine is costly in terms of disk space and network traffic. There is an argument that such information should always be distributed across the network, but the level of redundancy that SSH requires for installations of 1,000+ clients is inefficient. For
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Part III:
Security
consistency s sake, providing a single sign-on mechanism ensures that credentials used by a number of common services are authenticated in a dependable way. One alternative to using SSH servers as the primary means of authentication across a network is to use a centralized authentication system such as Kerberos, which grew out of the Athena Project at the Massachusetts Institute of Technology (MIT). Kerberos is a network authentication protocol that is designed to provide strong authentication for client/server applications by using secret-key cryptography, which is similar to that provided by SSH. However, the main difference between the two systems is that whereas authentication is performed by the target server when using SSH, a Kerberos authentication server can provide services to many different servers for a large number of clients by using a Key Distribution Center (KDC). Thus, the many-to-many relationships realized in the Kerberos authentication database makes the network authentication process more streamlined and efficient. Kerberos also supports data integrity checks through message digests and data transmission privacy through encryption. Kerberos is also designed to provide authentication to hosts inside and outside a firewall, since many attacks may originate in internal networks that are normally considered trusted. In addition, Release 5 introduced the notion of realms, which are external but trusted networks, with authentication being extended beyond the firewall. Another advantage of the Kerberos system is that the protocol has been published and widely publicized, and a free implementation (including source code) is available from MIT (http://web.mit.edu/network/kerberos-form.html). Kerberos is based around a key distribution, certificate granting, and a validation system called tickets. If a client machine wants to make a connection to a target server, it requests a ticket from a centralized authentication server, which is physically the same machine as the target server, but is logically quite separate. An encrypted ticket is produced by the authentication server that authorizes the client to request a specific service from a specific host, generally for a specific time period. This is similar to a parking-ticket machine that grants the drivers of motor vehicles permission to park in a specific street for one or two hours only. Release 5 of Kerberos supports tickets that can be renewed on request. Tickets may also be transferred across different machines without reauthentication, and may be issued before they are valid timewise. When authentication is requested from the authentication server, a session key is created by that server, which is based on your password that it retrieves from your username and a random value that represents the requested service. The session key is like a voucher that the client then sends to a ticket-granting server, which then returns a ticket that can be used to access the target server. Clearly, there is some overhead in making a request to an authentication server, a ticket-granting server, and a target server. However, the overhead is well worth the effort if important data is at risk of interception. The sequence of events leading to authentication is shown in Figure 13-1. A significant limitation of Kerberos is that all applications that use its authentication services must be Kerberized : that is, significant changes must be made to the application s source code in order for it to use Kerberos services. Solaris 10 provides Kerberized versions of the following applications:
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