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You ve just examined how to use the su facility to invoke superuser privileges from an unprivileged account The user with UID=0 (typically the root user) has unlimited powers to act on a Solaris system The root user can perform the following potentially dangerous functions: Add, delete, or modify all other user accounts Read and write all files, and create new ones Add or delete devices to the system Install new system software Read everyone s e-mail Snoop network traffic for usernames and passwords of other systems on the LAN Modify all system logs to remove all traces of superuser access Pretend to be an unprivileged user and access their accounts on other systems where login access is authenticated against a username These powers combine to make the root account sound rather sinister: however, many of these activities are legitimate and necessary system administration routines that are undertaken daily.

For example, network traffic can be snooped to determine where network outages are occurring, and copying user files to backup tapes every night is generally in everyone s best interest However, if an intruder gains root access, they are free to roam the system, deleting or stealing data, removing or adding user accounts, or installing Trojan horses that can transparently modify the way that your system operates One way to protect against an authorized user gaining root access is to use a hard-toguess root password This makes it difficult for a cracker to use a password-cracking program to guess your password successfully The optimal password is a completely random string of alphanumeric and punctuation characters In addition, the root password should never be written down unless it is locked in the company safe, nor should it be told to anyone who doesn t need to know it.

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The root password must usually be entered twice just in case you should happen to make a typographical error, as the characters that you type are masked on the screen..

Part III:

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.

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:

but not where it sensed that there were borders full of flowers or garden ornaments. As you can see, these behaviors, which on the face of it are very simple, can be combined to make an automated device that has more complex behaviors, and can relieve the tedium of simple human tasks, while at the same time not consuming precious fossilfuel energy.

Seven Although they are less efficient than single crystal, once the polycrystalline cells are set into a frame with 35 or so other cells, the actual difference in watts produced per square foot is not significant. These panels are also sliced from long cylinders of silicon, but the silicon used is multicrystalline, which is easier to make. They are similar to monocrystalline panels in performance and degradation. Several production techniques can be used to create polycrystalline panels.

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:

console pts/0

Nov 22 12:39 Nov 19 21:05

(client.site.com)

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