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The following key concepts are required to understand how Solaris supports modems and Internet access.
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Remote access is the hallmark of modern multiple-user operating systems such as Solaris and its antecedents, such as VAX/VMS. Unlike the single-user Windows NT system, users can concurrently log into and interactively execute commands on Solaris server
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systems from any client that supports Transmission Control Protocol/Internet Protocol (TCP/IP), such as Solaris, Windows NT, and Macintosh. Solaris can support hundreds to thousands of interactive user shells at any one time, constrained only by memory and CPU availability. In this section, we examine several historically popular methods of remote access, such as telnet. We also outline the much-publicized security holes and bugs that have led to the innovation of secure remote access systems, such as secure shell (SSH). These safer systems facilitate the encryption of the contents of user sessions and/or authentication sequences and provide an important level of protection for sensitive data. Although remote access is useful, the administrative overhead in securing a Solaris system can be significant, reflecting the increased functionality that remote access services provide.
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telnet is the standard remote access tool for logging into a Solaris machine from a client using the original DARPA Telnet protocol. A client can be executed on most operating systems that support TCP/IP. telnet is a terminal-like program that gives users interactive access to a login shell of their choice (for example, the C shell, or csh). Most telnet clients support VT100 or VT220 terminal emulations. The login shell can be used to execute scripts, develop applications, and read e-mail and news in short, everything a Solaris environment should provide to its users, with the exception of X11 graphics and OpenWindows, or more recently the common desktop environment (CDE). A common arrangement in many organizations is for a Solaris server to be located in a secure area of a building, with telnet-only access allowed. The sequence of events that occur during a telnet session begins with a request for a connection from the client to the server. The server responds (or times out) with a connection being explicitly accepted or rejected. A rejection may occur because the port that normally accepts telnet client connections on the server has been blocked by a packet filter or firewall. If the connection is accepted, the client is asked to enter a username followed by a password. If the username and password combination is valid, a shell is spawned and the user is logged in. The standard port for telnet connections is 23. Thus, a command like this,
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$ telnet server
is expanded to give the effective command
$ telnet server 23
This means that telnet can be used as a tool to access a service on virtually any port. telnet is controlled by the super Internet daemon (inetd), which invokes the in.telnetd server. An entry is made in /etc/services that defines the port number for the telnet service, which looks like this:
telnet 23/tcp
24:
Remote Access
The configuration file /etc/inetd.conf also contains important details of the services provided by inetd. The telnet daemon s location and properties are identified here:
telnet stream tcp nowait root /pkgs/tcpwrapper/bin/tcpd in.telnetd
In this case, you can see that in.telnetd is protected by the use of TCP wrappers, which facilitate the logging of telnet accesses through the Solaris syslog facility. In addition, inetd has some significant historical security holes and performance issues that, although mostly fixed in recent years, have caused administrators to shy away from servers invoked by inetd. The Apache Web server (http://www.apache.org), for example, runs as a standalone daemon process and does not use inetd.
Port Monitors
Central to the idea of providing services through serial ports is the port monitor, which continuously monitors the serial ports for requests to log in. The port monitor doesn t process the communication parameters directly, but accepts requests and passes them to the operating system. Solaris 10 uses the ttymon port monitor, which allows multiple concurrent getty requests from serial devices. To configure the port for a terminal, start up admintool and enter the user mode, which can be either Basic, More, or Expert. In most cases, Basic setup will be sufficient. admintool allows the configuration of most parameters for the port, including the baud rate for communications, default terminal type, flow control, and carrier detection; but note that it is being deprecated. The values entered here should match those on the matching VT-100 terminal. Once you have saved the settings, it is possible to check the validity of the settings by using the pmadm command:
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