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If the resulting expression is a string, integer, or oat the variable will be created and assigned that value and type. If the variable already exists but is of a different type and/or value it will be erased and assigned the new type and value. The array must have been created using the Dim or Data command. The element speci cation must be legal for the array dimension speci ed in the Dim command (see array commands in Sec. C.7). The array element is treated as if it is a variable name and the above information regarding variables is applicable.

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:

( severity = 70, emailto = chris@turtle.mytrek.com ) { /chris/myfile -> +ps; /chris/myproject -> +sM; }

See Sec. B.7 for details on expressions and what constitutes an expression. A few additional details are given here. Expressions can contain previously assigned variables and/or array elements. If an array element is speci ed then it must have been assigned and be within the range of the array s dimensional constraints as speci ed in the Dim command. Expressions can also contain functions (see Sec. C.8). Expressions can also contain bitwise, logical, comparison, and math operators (see Sec. B.7.5)

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

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.

( rulename = "Chris Important Files", severity = 70, emailto = chris@turtle.mytrek.com ) { /chris/myfile -> +ps; /chris/myproject -> +sM (recurse = false); }

NOTE:

Other definitions include the restriction that risk is based on realworld events, including a combination of circumstances in the external environment We do not agree with this limitation Potential risks that might occur in the future are excluded In addition, we do not limit the range of risk to circumstances in the external environment Many crises in the economy and the financial services industry happen because of problems within organizations These often have to do with problems in the human resource area, which belong in the realm of the behavioral sciences The term risk is linked to the possibility of deviation This means that the possibility of risk can be expressed as a probability, ranging from 0 to 100 percent Therefore, the probability is neither impossible nor definite This definition does not require that the probability be quantified, only that it must exist.

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:

SEC_INVARIANT = +tpug ;

If all the numbers involved in an expression are integers the result will be an integer. If any of the numbers is a oat then the result will be oat.

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:

B = sin(pi(2*Theta^2))/(3+4*Acceleration)

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:

Dynamic is used for configuration files, and Growing for log files, as shown here: