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With the increased use of the Internet for business-to-business and consumer-to-business transactions, securing remote access has become a major issue in the provision of Solaris services. Fortunately, solutions based around the encryption of sessions and authentication of clients has improved the reliability of remote access facilities in a security-conscious operating environment.
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Open Secure Shell, OpenSSH, or just plain SSH is a secure client and server solution that facilitates the symmetric and asymmetric encryption of identification and authentication sequences for remote access. It is designed to replace the telnet and rlogin applications on the client side with clients available for Solaris, Windows, and many other operating systems. On the server side, it improves upon the nonsecure services supported by inetd, such as the r-commands. SSH uses a generic transport layer encryption mechanism over TCP/IP, which uses the popular Blowfish or U.S. government endorsed triple-DES (Data Encryption Standard) algorithms for the encryption engine. This is used to transmit encrypted packets whose contents can still be sniffed like all traffic on the network by using public-key cryptography, implementing the Diffie-Hellman algorithm for key exchange. Thus, the contents of encrypted packets appear to be random without the appropriate key to decrypt them. The use of encryption technology makes it extremely unlikely that the contents of the interactive session will ever be known to anyone except the client and the server. In addition to the encryption of session data, identification and authentication sequences are also encrypted using RSA encryption technology. This means that username and password combinations also cannot be sniffed by a third party. SSH also provides automatic forwarding for graphics applications, based around the X11 windowing system, which is a substantial improvement over the text-only telnet client. It is sensible in a commercial context to enforce a policy of SSH-only remote access for interactive logins. This can easily be enforced by enabling the SSH daemon on the server side and removing entries for the telnet and rlogin services in /etc/services and /etc/inetd.conf. Now that OpenSSH is supplied with Solaris, there is no excuse for not deploying SSH across all hosts in your local network.
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The listen port monitor is managed by the listen and nlsadmin commands. In contrast to ttymon, the listen port monitor manages network ports and connections by listening for requests to access services and daemons. The listen monitor uses the Transport Layer Interface (TLI) and STREAMS to implement OSI-compliant network service layers. STREAMS provides a framework for writing network-enabled applications, giving access to the kernel, system calls, and a set of standard network libraries. STREAMS applications have many advantages over non-STREAMS applications, including the ability to collect performance data and analyze it in a standard way. Specific network ports are assigned to the listen monitor, and child processes are spawned to handle each client request. One of the key features of listen is that it can provide services that are not managed by inetd since all daemons can be accessed through a listen service. This is an important feature for the different users accessing services on a Solaris system. For example, a network connection could serve Web traffic, while a dial-in connection could cater to telnet or SSH access.
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The nlsadmin command is used to set up transport providers for STREAMScompatible network services. In order to configure a TLI listener database, you can use the nlsadmin command to configure the listener. First, you create the TCP/IP database:
# nlsadmin -i tcp
Next, you set the local hexadecimal address:
# nlsadmin -l \x11331223a11a58310000000000000000 tcp
All services that need to be run will then need to be entered into the TLI listener database.
Adding a Serial Port
Like any modern server system, Solaris 10 supports the connection of simple external devices through both a serial (RS-232-C or RS-423) and a parallel port. The two most common uses for serial devices on a SPARC system are connecting a VT-100 terminal or equivalent, to operate as the system console if no graphics device is installed, and as a modem, enabling dial-up Internet access using PPP. The former is a common practice in many server rooms, where the expense of a monitor and video card can be eliminated by using a VT-100 terminal as the console, because many SPARC machines require a display device to boot at all. On x86 systems, there are many more devices available that often have drivers available only for other operating systems. Sun and other thirdparty hardware vendors are slowly making releases available for these devices through the Solaris Developer Connection. If you need to obtain an updated copy of the Solaris Device Configuration Assistant, and any updated device drivers for supported external devices, these are currently available for download at http://soldc.sun.com/support/ drivers/boot.html.
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