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/etc/tripwire/twinstall.sh
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twinstall.sh actually runs a siggen command to create your passphrases and then the twadmin command to create your policy and configuration files. If you later want to change the configuration or policy files, you can run twadmin directly, without changing your passphrases. If you want to just change your passphrases, you can run the siggen command. To replace both files and both passphrases, you can just run twinstall.sh again. Should you later want to make changes to the Tripwire configuration file, you can edit the /etc/tripwire/twcfg.txt file and use it with the twadmin command to create a new signed tw.cfg file, as shown here:
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twadmin --create-cfgfile /etc/tripwire/twcfg.txt
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Creating a new policy file is more complicated and is covered in the policy update section.
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Once the configuration and policy files have been created, you can create the database of signatures for your monitored files and programs by invoking Tripwire with the --init option. You will initially be prompted to enter your local passphrase, which you specified when you ran twinstall.sh:
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tripwire --init
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The Tripwire datebase is kept in /var/lib/tripwire and given the name of the host with the extension .twd. For example, the Tripwire database for turtle.mytrek.com will be /var/lib/tripwire/turtle.mytrek.com.twd. Note It is recommended, for strong security, to place the Tripwire database on read-only media, like a floppy disk or CD-ROM. You can reconfigure specifying a new Tripwire database directory, or use the -d option to manually specify the location of the Tripwire database with your Tripwire commands. Now that your database is created, you can use Tripwire to periodically check the integrity of your system. You can do this manually with the --check option. You could also set up Tripwire --check commands as cron jobs to be run automatically at specified times. Red Hat will place a Tripwire --check command in the /etc/cron.daily file and will run Tripwire daily:
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tripwire --check
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Tripwire will check all the files listed in your policy file and generate a report. Tripwire reports are placed in files bearing as their name the hostname, date, and time of the report, with the extension .twr. For example, the report generated on August 12, 2001 at 10:29:54 will have the name 20010812-102954.twr. These files are kept in the /var/lib/tripwire/report directory. The report will list any violations, noting a severity level and indicating whether files were added, removed, or modified. Note If you performed a standard install, you will notice many error messages for missing files. Red Hat assumes a full installation and has set the Tripwire policy file to check for all Red Hat software files. Many of these will be in the Root Config Files rule and in the System Boot Changes rule (daemons). You will have to edit the twpol.txt file to remove these entries, and then generate a new policy and database file (see policy update
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section). To view reports, you use the twprint command with the --print-report option. You will have to specify the file you want with the -r option as well. The report is displayed on the standard input, scrolling across your screen. You can redirect it to a file to save it, or pipe it to the more or less commands to view it screen by screen. The following example opens the 20010812-102954.twr report, piping the output to the more command:
twprint --print-report -r /var/lib/tripwire/report/20010812-102954.twr | more
You can also use twprint to query the database for information about particular files. Use the --print-dbfile option and the filename:
twprint --print-dbfile /etc/passwd
As your system changes with files being modified, your Tripwire database can become outdated. You can update the Tripwire database to incorporate those reported violations as correct entries by using the --update option. You will have to specify the particular report file that holds the errors reports for the valid data.
tripwire --update -r /var/lib/tripwire/report/20010812-102954.twr
Tripwire will first open the file in an editor with those selected as updates to be incorporated having an [x] in front of their entries (unselected ones will have empty brackets, [ ]). Should you notice any valid violations that are marked for update, you can deselect them by removing the preceding x. When finished, save and quit the file with the Editor's save command (the EDITOR variable in the twcfg.txt file determines what editor to use-Vi by default). You are then prompted to enter a local passphrase for your local key. Note To control the monitoring of files that no longer exist or are newly installed on your system, you will have to change the policy file (see the next section). The update procedure only deals with modification or feature changes.
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