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lidsadm -A -s /usr/X11R6/bin/XF86_SVGA -t -o CAP_SYS_RAWIO -j INHERIT
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This gives XF86_SVGA the capability of CA_SYS_RAWIO, whereas other programs are unable to obtain CAP_SYS_RAWIO capability
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Part VI Tuning for Performance and Scalability
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Disabling network administration tasks
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By default, the CAP_NET_ADMIN capability is turned off, which means that a network administrator (typically the root user) can no longer perform the following network administration tasks: Configuring the Ethernet interface Administering IP firewall, masquerading, and accounting Setting debug option on sockets Modifying routing tables Setting arbitrary process/process group ownership on sockets Binding to any address for transparent proxying Setting Type of Service (TOS) Setting promiscuous mode Clearing driver statistics Multicasting Setting the read/write of device-specific registers The default setting is highly recommended If you do need to perform one of the above tasks, simply turn off LIDS temporarily with the /sbin/lidsadm -S -- LIDS command
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Protecting the Linux immutable flag for files
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The ext2 file system has an extended feature that enables you to flag a file as immutable This is done with the chattr command For example, the chattr +i /path/to/myfile turns /path/to/myfile into an immutable file A file with the immutable attribute cannot be modified or deleted or renamed, nor can it be symbolically linked However the root user is able to change the flag by using the chattr -i /path/to/myfile command You can protect immutable files even from the superuser (root) by disabling the CAP_LINUX_IMMUTABLE capability Note that the CAP_LINUX_IMMUTABLE is disabled by default in /etc/lids/lidscap
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If you have enabled the built-in port scanner during kernel compilation as recommended in the LIDS installation section discussed earlier, you can detect port scanners This scanner can detect half-open scan, SYN stealth port scan, Stealth FIN, Xmas, or Null scan, among others Tools such as nmap and Satan or Saint can be detected by the detector It is useful when raw socket (CAP_NET_RAW) is disabled
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Note
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When CAP_NET_RAW is turned off some user-land scanners based on sniffing will not work properly But the kernel-based scanner provided by LIDS does not use any socket, which makes it more secure You might want to consider using the LIDS supplied scanner
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23 Creating a High-Availability Network
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Responding to an intruder
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When LIDS detect a violation of any of the ACL rules, it can respond to the action by following method Logging the message When someone violates an ACL rule, LIDS will log a message using the kernel log daemon (klogd) Sending e-mail to the appropriate authority LIDS can send e-mail when a violation occurs This feature is controlled by the /etc/lids/lidsnet file, which is discussed in Step 5 of the Compiling, installing, and configuring LIDS section earlier in this chapter Hanging up the console If you enabled this option during kernel patching for LIDS as discussed in Step 9 in the LIDS installation section, the console will be dropped when a user violates a ACL rule Another similar system to LIDS is the OpenWall project (wwwopenwallcom/ linux) The OpenWall project contains some security features that are different from those found in LIDS, and one particular OpenWall patch makes the stack area of a process nonexecutable You should take a look at this work-in-progress project
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A P P E N D I X
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HTTP 11 Status Codes
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or each request from a Web client, the Web server must return to the client an HTTP status code, which consists of a three-digit number A Web client can attempt to understand the server s response by looking at this status code, sent in the HTTP Status-Line header The code is accompanied by a short phrase, called a reason phrase, which is intended to provide a brief explanation for the user For example, an HTTP Status-Line header might look like this:
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HTTP/11 404 Not Found
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Here, 404 is the status code and Not Found is the reason phrase On a typical Web client, a Web browser will display the Not Found phrase in the browser window Five different classes of status codes are available from the latest HTTP 11 specifications; these classes are discussed in the following sections
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Informational Status Codes (100 199)
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The purpose of this type of status code is to let the client know that the server is in the process of fulfilling a request These status codes are only informational; the client does not have to act on any of them Note that HTTP 10 does not define 1xx status codes, so 1xx status codes must not be sent to HTTP 10 clients The currently defined 1xx status codes are:
100 Continue The server sends this code to let the client know it is ready to receive the rest of the request 101 Switching Protocols The server sends this code when it is willing to switch the application protocol