Creating a High-Availability Network in VS .NET

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23 Creating a High-Availability Network
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Attribute MAILPROGRAM = /path/to/ mail/program
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Meaning Default: MAILPROGRAM = /usr/sbin/ sendmail -oi -t This attribute specifies the mail daemon path and any arguments that you need to supply to run it This attribute only makes sense if you are using MAILMETHOD = SENDMAIL
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EMAILREPORTLEVEL = 0 - 4
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Default: EMAILREPORTLEVEL = 3 This attribute specifies the level of information reported via email Leave the default as is
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MAILNOVIOLATIONS = true | false
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Default: MAILNOVIOLATIONS = true If you wish to not receive e-mail when no violation is found, set this to false
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To test your e-mail settings, you can run Tripwire by using the /usr/sbin/ tripwire -m t -email your@emailaddr command Don t forget to change the you@emailaddr to your own e-mail address
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Securing Apache using the Linux Intrusion Detection System (LIDS)
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Root is the source of all evil The previous statement probably only makes sense to the Unix/Linux system administrators of the world Once an unauthorized root access is confirmed, damage control seems hopeless or at the mercy of the intruder In a plain-vanilla Linux system, several subsystems are typically unprotected The file system is often left as open as the wild, wild, West There are many important files, such as the /bin/login, in the system, that hackers exploit frequently because they are not protected If a hacker breaks in, the hacker can upload a modified version of the login program as /bin/login to allow him or her free access to the system in the future But the fact of the matter is that files (that is, programs) such as /bin/login files do not need to change frequently (if at all); therefore, they must not be left unprotected Like the file system, the running processes are also unprotected Many processes run with the root privileges, which means that when they are exploited using tricks such as buffer overflow, the intruder gains full root access to the system Reducing the power of the root user enhances system security LIDS does that It actually does quite a few other things It implements a very low-level security model in the kernel to provide security protection, incident detection, and incident response capabilities For example, LIDS can:
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Part VI Tuning for Performance and Scalability
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Protect important files and directories from unauthorized access on your hard drive no matter what local file system they reside on Chosen files and directories can be protected from modifications by the root user, which means that an unauthorized root access will not turn the intruder into the super evil we all fear Protect important processes from being terminated by anyone including the root user Again, this reduces root user capabilities Prevent raw I/O operations from unauthorized programs It can also protect a hard drive s master boot record (MBR) LIDS can detect when someone scans your system using port scanners and can inform the system administrator via e-mail of the scan LIDS can also notify the system administrator whenever it notices any violation of imposed rules When someone violates such a rule, LIDS can log detailed messages about the violations in LIDS-protected, temper-proof log files In fact, LIDS can not only log and send e-mail about detected violations, it can immediately shut down the user s interactive session! LIDS is a kernel patch and a suite of administrative tools that enhances security from within the very kernel of the Linux operating system Because in the LIDS security model the subject, object, and access type all are in the kernel, it is called a reference monitor The LIDS project Web site is wwwlidsorg/abouthtml LIDS enables Linux system to run a customized kernel and you must have the latest kernel source from a reliable kernel site such as wwwkernelorg After you have downloaded and extracted the kernel into /usr/src/linux, download the LIDS patch for the specific kernel that you want to use For example, if you are using kernel 241, make sure you download the LIDS patch from the LIDS project Web site Typically the LIDS patch and administrative tool package is called lids-xxx yyytargz where xxx represents the LIDS version number and yyy represents the kernel version (for example, lids-105-241) I use LIDS 105 for kernel 241 in the instructions below Make sure you change the version numbers as needed Extract the LIDS source distribution into the /usr/local/src directory with tar xvzf lids-105-241targz command from the /usr/local/src directory Now you are ready to patch the kernel
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