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The root user should never be able to log in using Telnet: instead, the su facility should be used by individual users to gain root privileges where necessary. This protects the root account, since at least one other password is required to log in, unless the root user has access to the console. In addition, the su command should be owned by a sysadmin group (or similar) so that only those users who need access to the root account should be able to obtain it. Once su has been used to gain root access, the root user can use su to spawn a shell with the effective ID of any other user on the system. This is a security weakness, because the root user could pretend to be another user and perform actions or modify data which is traceable to the effective user, and not root. A more practical and secure solution in a large Solaris environment is to use solutions such as one-time passwords or a mechanism that employs two-factor authentication such as SecurID. It s also very important to check for obvious flaws in the content of the password and group files, such as empty passwords or group affiliations, which should always be checked and fixed.
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System access can be monitored interactively using a number of measures. For example, syslog entries can be automatically viewed in real time using this command:
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$ tail -f /var/adm/messages
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However, most administrators want to view interactively what remote users are doing on a system at any time. This section examines two methods for viewing remoteuser activity. The command who displays who is currently logged into the system. The output of who displays the username, connecting line, date of login, idle time, process ID, and a comment. Here s an example output:
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$ who root natashia
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console pts/0
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This command can be automated to update the list of active users. An alternative to who is the w command, which displays a more detailed summary of the current activity on the system, including the current process name for each user. The header output from w shows the current time, the uptime of the current system, and the number of users actively logged into the system. The average system load is also displayed as a series of three numbers at the end of the w header, indicating the average number of jobs in the run queue for the previous 1, 5, and 15 minutes. In addition to the output generated by who, the w command displays the current foreground process for each user, which is usually a shell. For example, the following command shows that the root user has an active perl process, while the user natashia is running the Cornell shell:
7:15pm User up 1 day(s), tty 5:11, 2 users, load average: 1.00, 1.00, 1.01 login@ idle JCPU PCPU what
9:
System Security
root console natashia pts/12
Thu12pm 3days Thu11am 8:45
perl /usr/local/bin/tcsh
The w and who commands are useful tools for getting an overview of current usage patterns on any Solaris system. Another useful command is last, which displays historical usage patterns for the current system in a sequential format:
$ last natashia root natashia natashia root reboot natashia natashia natashia natashia root reboot natashia natashia root reboot root reboot natashia root reboot root
pts/4 console pts/2 pts/6 console system boot pts/5 pts/5 pts/5 pts/5 console system boot pts/5 pts/5 console system boot console system boot pts/6 console system boot console
hp :0 nec austin :0 hp hp 10.64.18.1 hp :0 hp hp :0 :0 hp :0 :0
Wed Tue Tue Tue Tue Tue Thu Thu Thu Thu Thu Thu Tue Tue Tue Tue Fri Fri Tue Tue Tue Mon
Apr Apr Apr Apr Apr Apr Apr Apr Apr Apr Apr Apr Apr Apr Apr Apr Mar Mar Mar Mar Mar Mar
11 10 10 10 10 10 5 5 5 5 5 5 3 3 3 3 30 30 27 27 27 26
19:00 20:11 19:17 15:53 14:24 14:04 21:38 21:22 19:30 19:18 19:17 19:14 16:14 08:48 08:45 08:43 18:54 18:46 20:46 19:50 19:48 17:43
still logged in still logged in - 19:24 (00:06) - 15:53 (00:00) - 16:25 (02:01) 21:40 (00:01) 21:37 (00:15) 20:00 (00:30) 19:29 (00:11) 22:05 (4+02:48) (02:11) (01:47) (13:15) (00:32) (01:04) (02:01) (00:04)
- 18:26 - 10:35 - 22:01 - 19:27 - 21:51 - 21:51 - 17:47
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