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System Security
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Authenticating an SSH connection
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In addition, a private key for the client is stored in Identity, and a public key for the client is stored in Identity.pub. Entries in this file are similar to the server key file:
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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. Also, there are many items in the /etc/ssh/ssh_config and /etc/ssh/sshd_config files that can be configured, such as whether X11 can be forwarded, or whether to support IPv4, IPv6, or both.
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The following examples show how to implement basic security measures for Solaris.
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It may seem obvious, but if an intruder can physically access your system, then they may be able to take control of your system without the root password, bypassing all the software-based controls that normally limit such activity. How is this possible If the
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Part III:
Security
intruder has access to a bootable CD-ROM drive and a bootable CD-ROM (of Solaris, Linux, or any other operating system that can mount UFS drives), it s a trivial matter to enter the following command at the OpenBoot prompt and start the system without a password:
ok boot cdrom
Once the system has booted from the CD-ROM drive, a number of options are available to the intruder: FTP any file on the system to a remote system. Copy any file on the system to a mass storage device (such as a DAT tape). Format all the drives on the system. Launch a distributed denial of service (DDoS) attack against other networks, which you will be blamed for. Of course, the possibilities are endless, but the result is the same. You may ask why compromising a system in this way is so easy. One good reason is that if you forget your root password, you can boot from the CD-ROM, mount the boot disk, and manually edit the shadow password file. This requirement doesn t really excuse poor security, and the OpenBoot monitor provides some options to secure the system. There are three security levels available: None Surprisingly, this is the default. No password is required to execute any of the commands in OpenBoot. This is convenient but dangerous, for the reasons outlined earlier. Command This level needs a password to be entered for all commands except boot and go. Thus, details of the SCSI bus and network traffic can t be observed by the casual browser, but an intruder could still boot from the CD-ROM. Full This level requires a password for every command except go, including the boot command. Thus, even if the system is interrupted and rebooted using the boot command, only the default boot device will be available through go. To set the security level, use the eeprom command. To set the command level, use the following command:
# eeprom security-mode=command
Or, to set the command level, use the following command:
# eeprom security-mode=full
The password for the command and full security levels must be set by using the eeprom command:
9:
System Security
# eeprom security-password Changing PROM password: New password: Retype new password:
Note that if the root password and the full-level password are lost, there is no way to recover the system by software means. You will need to order a new PROM from Sun.
Security Auditing
After installing a new Solaris system and applying the local security policy, you must perform a security audit to ensure that no known vulnerabilities exist in the system, particularly threats posed by remote access. As examined earlier in this chapter, there are a number of strategies, such as switching off ports, that should be adopted prior to releasing a system into production and making it accessible through the Internet. A security audit should first examine what services are being offered and determine an action plan based on services that should be disabled. In addition, monitoring and logging solutions should be installed for services that are sanctioned, so that it is possible at all times to determine what activity is occurring on any service. For example, a DoS attack may involve hitting a specific port (such as port 80, the Web server port) with a large number of packets, aimed at reducing overall performance of the Web server and the host system. If you don t have logs of all this activity, it will be difficult to determine why your system performance is slow and/or where any potential attacks have originated that s why TCP wrappers are so important. The final phase of a security audit involves comparing the current list of services running on the system to the security bulletins that are released by the Computer Emergency Response Team (CERT) (http://www.cert.org/) and similar computer security groups. After determining the versions of software running on your system, you should determine which packages require patching and/ or upgrading in order to eliminate the risks from known vulnerabilities.
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