Tripwire – IDS dedykowany kontroli plików | CentOS- otwarty system operacyjny dla biznesu

Tripwire – IDS dedykowany kontroli plików

dodany przez Przemysław Sikora

Bezpieczeństwo powinno być dla każdego administratora priorytetem. Oczywiście stabilność i szybkość też się liczą. Co jednak z wydajności, jak mamy dziurawy serwera lub aplikację. Omówię instalację narzędzia typu IDS, które jest dedykowane kontroli plików, a dokładniej ich modyfikacjom. Często zdarza się, że złośliwy kod dopisuje się do początku lub końca pliku np. strony www i powoduje niepożądane działania. Omawiana wersja jest darmowa. Istnieje jeszcze „odmiana” Enterprise o poszerzonych możliwościach.
Przystępujemy do instalacji.
```
yum install tripwire
```
Tworzymy dwa klucze niezbędne do działania omawianego narzędzia
```
tripwire-setup-keyfiles
```
---------------------------------------------- The Tripwire site and local passphrases are used to sign a variety of files, such as the configuration, policy, and database files.
Passphrases should be at least 8 characters in length and contain both letters and numbers. See the Tripwire manual for more information. ---------------------------------------------- Creating key files... (When selecting a passphrase, keep in mind that good passphrases typically have upper and lower case letters, digits and punctuation marks, and are at least 8 characters in length.) Enter the site keyfile passphrase: Verify the site keyfile passphrase: Generating key (this may take several minutes)...Key generation complete. (When selecting a passphrase, keep in mind that good passphrases typically have upper and lower case letters, digits and punctuation marks, and are at least 8 characters in length.) Enter the local keyfile passphrase: Verify the local keyfile passphrase: Generating key (this may take several minutes)...Key generation complete. ---------------------------------------------- Signing configuration file... Please enter your site passphrase: Wrote configuration file: /etc/tripwire/tw.cfg A clear-text version of the Tripwire configuration file: /etc/tripwire/twcfg.txt has been preserved for your inspection. It is recommended that you move this file to a secure location and/or encrypt it in place (using a tool such as GPG, for example) after you have examined it. ---------------------------------------------- Signing policy file... Please enter your site passphrase: Wrote policy file: /etc/tripwire/tw.pol A clear-text version of the Tripwire policy file: /etc/tripwire/twpol.txt has been preserved for your inspection. This implements a minimal policy, intended only to test essential Tripwire functionality. You should edit the policy file to describe your system, and then use twadmin to generate a new signed copy of the Tripwire policy. Once you have a satisfactory Tripwire policy file, you should move the clear-text version to a secure location and/or encrypt it in place (using a tool such as GPG, for example).
Now run "tripwire --init" to enter Database Initialization Mode. This reads the policy file, generates a database based on its contents, and then cryptographically signs the resulting database. Options can be entered on the command line to specify which policy, configuration, and key files are used to create the database. The filename for the database can be specified as well. If no options are specified, the default values from the current configuration file are used.
```
tripwire --init
```
Please enter your local passphrase: Parsing policy file: /etc/tripwire/tw.pol Generating the database... *** Processing Unix File System *** ### Warning: File system error. ### Filename: /usr/sbin/fixrmtab ### Nie ma takiego pliku ani katalogu ### Continuing... . . . . . Wrote database file: /var/lib/tripwire/nasz-serwer.pl.twd The database was successfully generated.

Konfiguracja
```
sh -c 'tripwire --check | grep Filename > test_results'
```
Wygenerowane zostaną pliki pomijane przez tripwire.
```
vim /etc/tripwire/twpol.txt
```
Edycja polityki
```
twadmin -m P /etc/tripwire/twpol.txt
```
Ponowne utworzenie polityki
Please enter your site passphrase: Wrote policy file: /etc/tripwire/tw.pol
```
tripwire --init
```
Reinicjalizacja bazy danych po zmianie polityki.
```
tripwire --check
```
Raporty tworzone są w „/var/lib/tripwire/report/”. Aby je odczytać wydajemy polecenie:
```
twprint --print-report --twrfile /var/lib/tripwire/report/nazw-pliku-raportu
```

Tripwire – IDS dedykowany kontroli plików

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