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To first use Tripwire, you will have to generate a configuration file and a policy file These files are generated by the twinstallsh script If you just want to use the standard configuration, you can generate the files immediately by running the twinstallsh script If you want to customize your configuration and policy files, you will have to first modify their editable versions in the /etc/tripwire directory There are two versions of these files One is a txt file that you can edit to customize your configuration, and the other will be generated by twinstallsh script using the txt file The configuration file will specify the Tripwire application directories and files, such as the directory where the Tripwire database is placed and reports are stored twcfgtxt is the editable version of the configuration file This file will already include the standard administrative files.

Var = Expr (a variable name followed by an equal sign (=) then an expression)

You can edit this file to add any files of your own The policy file holds the files, programs, and directories that you want Tripwire to check The twpoltxt file is its editable version You can edit this file to add or change policies to fit your system's particular needs Once you have made the changes you want to the twcfgtxt and twpoltxt files, you can then use the twinstallsh script to generate the twcfg and twpol files These are the actually configuration and policy files that Tripwire uses, and, for security reasons, should never be touched Table 6-3: Tripwire Commands and Files Description Initialize and perform integrity checking Administer Tripwire configuration and policy files, as well as Tripwire encryption keys Print and display Tripwire database and reports Generate new passphrases Generate keys and encrypted configuration and policy files Encrypted Tripwire configuration file.

Encrypted Tripwire policy file Plain text Tripwire configuration file Plain text Tripwire policy file Holds Tripwire reports Holds Tripwire databases..

risk A condition in which there exists a possibility of deviation from a desired outcome that is expected or hoped for.

Commands and Files tripwire twadmin twprint siggen twinstall.sh /etc/tripwire/tw.cfg /etc/tripwire/tw.pol /etc/tripwire/twcfg.txt /etc/tripwire/twpol.txt /var/lib/tripwire/report /var/lib/tripwire

VarA[ExprN{,ExprN....] = Expr (an array name[element speci cation] followed by an equal sign [=] then an expression)

The Tripwire policy file holds rules used to determine what files and programs to monitor and how they are checked. Rules consist of an object and a property mask. An object is either a directory or file and its entry in the rule consists of the full pathname for that file or directory. The property mask is a list of the object's properties to be checked, such as the size, permissions, or a checksum value like MD5. The object and property mask are separated by a -> symbol, and the entire rule is terminated by a semicolon. You can only have one rule per object. The property mask is a series of single-character codes denoting different file and directory features, such as p for permissions, s for size, t for type, and M for MD5 value. You can specify whether a property is to be checked or not with the + and - signs. +p says to check an object's permissions, -p says not to. See the Man page for twpolicy for a complete listing of the property codes. In the next example, the /chris/myfile object will have its permissions and size checked:

/chris/myfile -> +ps;

A variable does not have to be speci ed prior to assignment, but if you use this format a = a 4 then the variable must be previously speci ed because otherwise the interpreter will not know what the original value was and an error will occur.

Tripwire also defines several built-in variables that hold standard property sets for different types of objects. For example, ReadOnly lists standard properties for a file or directory that should have read-only access. The Dynamic built-in is used for monitoring files that tend to change. It will check properties like permissions and users that tend not to change, ignoring those like size and MD5 values that do. IgnoreAll will simply check to see if a file exists or not, ignoring all other properties. IgnoreNone will apply all properties to a file. This can be used for providing a high level of security.

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.

/chris/myfile -> +ps (emailto = chris@turtle.mytrek.com); /usr/bin -> ReadOnly (severity = 70, emailto = admin@turtle.mytrek.com);