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/usr/bin -> ReadOnly; /usr/sbin/slogin -> IgnoreNone /usr/chris/mydoc -> Dynamic
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You can further qualify rules with attributes such as severity to indicate the severity of a violation or emailto, in which you can specify an e-mail address to which a message is to be sent in case of a violation. Attributes are entered within parentheses following the rule. Separate several attributes with commas.
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/chris/myfile -> +ps (emailto = chris@turtle.mytrek.com); /usr/bin -> ReadOnly (severity = 70, emailto = admin@turtle.mytrek.com);
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You can also group rules together and apply the same attributes to them all. In this case, the rules are encased in braces and the attributes are listed in preceding parentheses. With this feature, you can avoid having to repeat attributes for several files. Also, you can easily add an attribute for several files at once. In the following example, the /chris/myfile and /chris/myproject directories are both assigned attributes for an e-mail address and a severity level:
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( severity = 70, emailto = chris@turtle.mytrek.com ) { /chris/myfile -> +ps; /chris/myproject -> +sM; }
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There are four attributes: rulename, emailto, severity, and recurse. The rulename attribute is often used to group rules under a title that will then be used in the Tripwire reports to list
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any violations in that group. The recurse attribute specifies if property checks for a directory are also applied to its subdirectories. The default is true, and a false value will not check any files in the directory. In the following example, rulename gives the name Chris Important Files to the rules listed in the previous example. Be sure to separate attributes with commas. Also the files and subdirectories in the /chris/myproject directory are not checked.
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( rulename = "Chris Important Files", severity = 70, emailto = chris@turtle.mytrek.com ) { /chris/myfile -> +ps; /chris/myproject -> +sM (recurse = false); }
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Tripwire also supports directives in which you can define variables or rules for certain hosts or file systems, as well as global variables. This allows an administrator to create a single policy file to be used on different hosts (see the twpolicy Man page for more details). A directive begins with @@section. On a standard Red Hat policy file, you will have a directive for the global variables, GLOBALS, and one for the Linux file system, FS. The GLOBALS section defines locations of Tripwire files and directories. On Red Hat, the FS section sets the variables used for different property sets, such as SEC_INVARIANT that is assigned the properties +tpug to check type, permissions, user, and group. This is used for files and directories that should not be changed. You will find the following entry in the Red Hat twpol.txt file:
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SEC_INVARIANT = +tpug ;
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A variable is evaluated by encasing it with parentheses and preceding it with the $ operator. $(SEC_INVARIANT) would be use as the property mask in different rules. The following example says that the /home directory itself should never be changed (those under it can, recurse = 0):
/home -> $(SEC_INVARIANT) (recurse = 0) ;
On Red Hat, even the built-in variables are also assigned to variables, some with certain qualifications. In the following example, the properties for ReadOnly are assigned to the SEC_BIN variable:
SEC_BIN = $(ReadOnly) ; # Binaries that should not change
The most widely used variable is SEC_CRIT, which is set to all the properties with IgnoreNone, with the SHa (S) and Havel (H) checksum values and the timestamp (a) property removed:
SEC_CRIT = $(IgnoreNone)-SHa ; # Critical files that cannot change
Dynamic is used for configuration files, and Growing for log files, as shown here:
SEC_CONFIG = $(Dynamic) ; # Config files SEC_LOG = $(Growing) ; # Files that grow
In addition, variables are set for security values. These include SIG_MED, SIG_LOW, and SIG_HIGH for noncritical, moderately critical, and severely critical violations. The following example is a segment of the Red Hat twpol.txt file, showing the rules for kernel administrative programs:
################################## # # # # # Kernel Administration Programs # # # ## ################################## ( rulename = "Kernel Administration Programs", severity = $(SIG_HI) ) { /sbin/adjtimex -> $(SEC_CRIT) ; /sbin/ctrlaltdel -> $(SEC_CRIT) ; /sbin/depmod -> $(SEC_CRIT) ; /sbin/insmod -> $(SEC_CRIT) ; /sbin/insmod.static -> $(SEC_CRIT) ; /sbin/insmod_ksymoops_clean -> $(SEC_CRIT) ; /sbin/klogd -> $(SEC_CRIT) ; /sbin/ldconfig -> $(SEC_CRIT) ; /sbin/minilogd -> $(SEC_CRIT) ; /sbin/modinfo -> $(SEC_CRIT) ; /sbin/sysctl -> $(SEC_CRIT) ; }
E-mail entries are not included in the Red Hat attributes for different rule groups. If you want Tripwire to notify you by e-mail when a certain violation occurs, you will have to edit the twpol.txt file and insert emailto attributes into the attribute list for those rule groups. For example, for the previous example you could have Tripwire notify the admin user when a kernel program is violated. Be sure to place a comma at the end of the preceding attribute-in this case, the severity attribute:
( rulename = "Kernel Administration Programs", severity = $(SIG_HI), emailto=admin@turtle.mytrek.com )
The Tripwire configuration file, twcfg.txt, is already set up for a Red Hat Linux installation. It will contain a number of Tripwire variables that you can modify should you wish. The DBFILE variable holds the directory that contains the database file. REPORTFILE specifies the directory where reports are stored. POLFILE contains the policy file. SITEKEYFILE and LOCALKEYFILE specify the location of your local and site key files. The twinstall.sh script will create digitally signed configuration and policy files. To do this, it will prompt you for local and site passphrases. The passphrases are passwords you will need to create a Tripwire database and to access Tripwire reports. You are then prompted to enter the site and local passphrases to generate the configuration and policy files:
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