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after which the password is entered, the password is authenticated by the server, and access is denied or granted. If the target user account has a different name than your current user account, you can try this:
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There are two main differences between Telnet and rlogin, however, which are significant. The first is that rlogin attempts to use the username on your current system as the account name to connect to on the remote service, whereas Telnet always prompts for a separate username. This makes remotely logging into machines on a single logical network with rlogin much faster than with Telnet. Second, on a trusted, secure network, it is possible to set up a remote authentication mechanism by which the remote host allows a direct, no-username/no-password login from authorized clients. This automated authentication can be performed on a system-wide level by defining an equivalent host for authentication purposes on the server in /etc/hosts.equiv, or on a user-by-user basis with the file .rhosts. If the file /etc/hosts.equiv contains the client machine name and your username, you will be permitted to automatically execute a remote login. For example, if the /etc/hosts.equiv file on the server contains this line,
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any user from the machine client may log into a corresponding account on the server without entering a username and password. Similarly, if your username and client machine name appear in the .rhosts file in the home directory of the user with the same name on the server, you will also be permitted to remotely log in without an identification/ authentication challenge. This means that a user on the remote system may log in with all the privileges of the user on the local system, without being asked to enter a username or password clearly a dangerous security risk. The sequence of identification and authentication for rlogin is shown in Figure 9-3.
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FIGURE 9-3
Identification and authentication sequence for rlogin
Remote-shell (rsh) connects to a specified hostname and executes a command. rsh is equivalent to rlogin when no command arguments are specified. rsh copies its standard input to the remote command, the standard output of the remote command to its standard output, and the standard error of the remote command to its standard error. Interrupt, quit, and terminate signals are propagated to the remote command. In contrast to commands issued interactively through rlogin, rsh normally terminates when the remote command does. As an example, the following command executes the command df k on the server, returning information about disk slices and creating the local file server.df.txt that contains the output of the command:
$ rsh server df -k > server.df.txt
Clearly, rsh has the potential to be useful in scripts and automated command processing.
Vulnerabilities
One of the unfortunate drawbacks of the Telnet system is that usernames and, especially, unencrypted passwords are transmitted in cleartext around the network. Thus, if you were using a Telnet client to connect from a cyber caf in Paris to a server in New York, your traffic might pass through 20 or 30 routers and computers, all of which can be
Part III:
Security
programmed to sniff the contents of network packets. A sample traceroute of the path taken by packets from AT&T to Sun s Web page looks like this:
$ traceroute www.sun.com Tracing route to wwwwseast.usec.sun.com [192.9.49.30] over a maximum of 30 hops: 1 184 ms 142 ms 138 ms 202.10.4.131 2 147 ms 144 ms 138 ms 202.10.4.129 3 150 ms 142 ms 144 ms 202.10.1.73 4 150 ms 144 ms 141 ms ia4.optus.net.au [202.139.32.17] 5 148 ms 143 ms 139 ms 202.139.1.197 6 490 ms 489 ms 474 ms sf1.optus.net.au [192.65.89.246] 7 526 ms 480 ms 485 ms gn.cwix.net [207.124.109.57] 8 494 ms 482 ms 485 ms core7.SanFrancisco.cw.net [204.70.10.9] 9 483 ms 489 ms 484 ms core2.SanFrancisco.cw.net [204.70.9.132] 10 557 ms 552 ms 561 ms xcore3.Boston.cw.net [204.70.150.81] 11 566 ms 572 ms 554 ms sun.Boston.cw.net [204.70.179.102] 12 577 ms 574 ms 558 ms wwwwseast.usec.sun.com [192.9.49.30] Trace complete.
That s a lot of intermediate hosts, any of which could potentially be sniffing passwords and other sensitive data. If the network packet that contains the username and password is sniffed in this way, a rogue user could easily log into the target account using a Telnet client. This risk has led to the development of SSH and similar products that encrypt the exchange of username and password information between client and server, making it difficult for sniffers to extract useful information from network packets. OpenSSH, an open source version of SSH, is now supplied with Solaris. Although rlogin is the fastest kind of remote login possible, it can be easily exploited on systems that are not trusted and secure. Systems that are directly connected to the Internet, or those that form part of a subnet that is not firewalled, should never be considered secure. These kinds of configurations can be dangerous in some circumstances, even if they are convenient for remotely administering many different machines. The most dangerous use of /etc/hosts.equiv occurs, for example, when the file contains the single line
This allows any users from any host that has equivalent usernames to remotely log in. The .rhosts file is also considered dangerous in some situations. For example, it is common practice in some organizations to allow the root and privileged users to permit automatic logins by root users from other machines by creating a /.rhosts file. A more insidious problem can occur when users define their own .rhosts files, however, in their own home directories. These files are not directly controlled by the system administrator and may be exploited by malicious remote users. One way to remove this threat is to enforce a policy of disallowing user .rhosts files and activating a nightly cron job to
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