The Tripwire configuration file is structured as a list of keyword-value pairs, and may also contain comments and variable definitions. Any lines with "#" in the first column are treated as comments.

The general syntax for variable definition is:

keyword  =  value

Variable substitution on the right hand side is permitted using the syntax:

$(  varname  )

Variable names are case-sensitive, and may contain all alphanumeric characters, underscores, the characters "+-@:", and the period. Two variables are predefined in the configuration file, and may not be changed. CWHOSTNAME is the unqualified hostname that Tripwire is running on, and CWDATE is a string representation of the date and time.

The following variables must be set in order for Tripwire to operate. The values listed below are assigned during installation.

POLFILE Default = /etc/tripwire/tw.pol DBFILE Default = /var/lib/tripwire/$(HOSTNAME).twd REPORTFILE Default = /var/lib/tripwire/report/$(HOSTNAME)-$(DATE).twr SITEKEYFILE Default = /etc/tripwire/site.key LOCALKEYFILE Default = /etc/tripwire/$(HOSTNAME)-local.key

The following variables are not required to run Tripwire, but some of the program's functionality will be lost without them. The values assigned during installation are listed.

CWEDITOR

Specifies an editor to be used in interactive modes. If EDITOR is not defined, and no editor is specified on the command line, using interactive modes will cause an error.

Initial value: /bin/vi

CWTEMPDIRECTORY

This variable can be set to the location to which tripwire should write its temporary files. By default it is /tmp, which due to the default permissions can be very insecure. It is recommended that you use this configuration variable to provide tripwire with a secure place to write temporary files. The directory used should have its permissions set such that only the owning process can read/write to it, i.e. "chmod 700".

Initial value: /tmp

CWGLOBALEMAIL

This variable is set to a list of email addresses separated by either a comma ",", or semi-colon ";". If a report would have normally been sent out, it will also be send to this list of recipients.

Initial value: none

CWLATEPROMPTING

Prompt for passphrase as late as possible to minimize the amount of time that the passphrase is stored in memory. If the value is true (case-sensitive), then late prompting is turned on. With any other value, or if the variable is removed from the configuration file, late prompting is turned off.

Initial value: false

CWLOOSEDIRECTORYCHECKING

When a file is added or removed from a directory, Tripwire reports both the changes to the file itself, and the modification to the directory (size, num links, etc.). This can create redundant entries in Tripwire reports. With loose directory checking, Tripwire will not check directories for any properties that would change when a file was added or deleted. This includes: size, number of links, access time, change time, modification time, number of blocks, growing file, and all hashes.

If the value for this variable is true (case-sensitive), then loose directory checking is turned on, and these properties will be ignored for all directories. With any other value, or if the variable is removed from the configuration file, loose directory checking is turned off. Turning loose directory checking on is equivalent to appending the following propertymask to the rules for all directory inodes: -snacmblCMSH

Initial value: false

CWSYSLOGREPORTING

If this variable is set to true, messages are sent to the syslog for four events: database initialization, integrity check completions, database updates, and policy updates. The syslog messages are sent from the "user" facility at the "notice" level. For more information, see the syslogd(1) man page and the syslog.conf file. The following illustrates the information logged in the syslog for each of the four events:

Jun 18 14:09:42 lighthouse tripwire[9444]: Database initialized: /var/lib/tripwire/test.twd

Jun 18 14:10:57 lighthouse tripwire[9671]: Integrity Check Complete: TWReport lighthouse 20000618141057 V:2 S:90 A:1 R:0 C:1 Jun 18 14:11:19 lighthouse tripwire[9672]: Database Update Complete: /var/lib/tripwire/test.twd

Jun 18 14:18:26 lighthouse tripwire[9683]: Policy Update Complete: /var/lib/tripwire/test.twd The letters in the Integrity Checking log correspond to # of violations, maximum severity level, and # of files added, deleted, and changed, respectively. With any value other than true, or if this variable is removed from the configuration file, syslog reporting will be turned off.

Initial value: true

CWREPORTLEVEL

Specifies the default level of report produced by the twprint --print-report mode. Valid values for this option are 0 to 4. The report level specified by this option can be overridden with the (-t or --report-level) option on the command line. If this variable is not included in the configuration file, the default report level is 3. Note that only reports printed using the twprint --print-report mode are affected by this parameter; reports displayed by other modes and other commands are not affected.

Initial value: 3

CWMAILMETHOD

Specifies the protocol to be used by Tripwire for email notification. The only acceptable values for this field are CWSMTP or CWSENDMAIL. Any other value will produce an error message.

Initial value: SENDMAIL

CWSMTPHOST

Specifies the domain name or IP address of the SMTP server used for email notification. Ignored unless CWMAILMETHOD is set to CWSMTP.

Initial value: mail.domain.com

CWSMTPPORT

Specifies the port number used with SMTP. Ignored unless CWMAILMETHOD is set to CWSMTP.

Initial value: 25

CWMAILPROGRAM

Specifies the program used for email reporting of rule violations if CWMAILMETHOD is set to CWSENDMAIL. The program must take an RFC822 style mail header, and recipients will be listed in the "To:" field of the mail header. Some mail programs interpret a line consisting of only a single period character to mean endofinput, and all text after that is ignored. Since there is a small possibility that a Tripwire report would contain such a line, the mail program specified must be able to ignore lines that consist of a single period (the -oi option to sendmail produces this behavior).

Initial value: /usr/lib/sendmail -oi -t

CWEMAILREPORTLEVEL

Specifies the default level of report produced by the tripwire --check mode email report. Valid values for this option are 0 to 4. The report level specified by this option can be overridden with the (-t or --email-report-level) option on the commandline. If this variable is not included in the configuration file, the default report level is 3.

Initial value: 3

CWMAILNOVIOLATIONS

This option controls the way that Tripwire sends email notification if no rule violations are found during an integrity check. If CWMAILNOVIOLATIONS is set to false and no violations are found, Tripwire will not send a report. With any other value, or if the variable is removed from the configuration file, Tripwire will send an email message stating that no violations were found.

Mailing reports of no violations allows an administrator to distinguish between unattended integrity checks that are failing to run and integrity checks that are running but are not finding any violations. However, mailing no violations reports will increase the amount of data that must be processed.

Initial value: true