1TWFILES(5) File Formats Manual TWFILES(5)
2
6 twfiles - overview of files used by Tripwire and file backup process
7
9 Configuration File
10 default: /etc/tripwire/tw.cfg
11 The configuration file stores system-specific information, such as the
12 location of Tripwire data files. The configuration settings are gener‐
13 ated during the installation process, but can be changed by the system
14 administrator at any time. See the twconfig(4) man page for a more
15 complete discussion.
16 Policy File
18 default: /etc/tripwire/tw.pol
19 The policy file consists of a series of rules specifying the system
20 objects that Tripwire should monitor, and the data for each object that
21 should be collected and stored in the database file. Should unexpected
22 changes occur, the policy file can describe the person to be notified
23 and the severity of the violation. See the policyguide.txt file in the
24 policy directory and the twpolicy(4) man page for a more complete dis‐
25 cussion.
26 Database File
28 default: /var/lib/$(HOSTNAME).twd
29 The database file serves as the baseline for integrity checking. After
30 installation, Tripwire creates the initial database file, a "snapshot"
31 of the filesystem in a known secure state. Later, when an integrity
32 check is run, Tripwire compares each system object described in the
33 policy file against its corresponding entry in the database. A report
34 is created, and if an object has changed outside of constraints defined
35 in the policy file, a violation is reported. See the tripwire(8) and
36 twprint(8) man pages for more information on creating and maintaining
37 database files.
38 Report Files
40 default: /var/lib/tripwire/report/$(HOSTNAME)‐$(DATE).twr
41 Once the above three files have been created, Tripwire can run an
42 integrity check and search for any differences between the current sys‐
43 tem and the data stored in the "baseline" Tripwire database. This
44 information is archived into report files, a collection of rule viola‐
45 tions discovered during an integrity check. With the appropriate set‐
46 tings, a report can also be emailed to one or more recipients. See the
47 tripwire(8) and twprint(8) man pages for information on creating and
48 printing report files.
49 Key Files
51 defaults: /etc/tripwire/site.key and /etc/tripwire/$(HOST‐
52 NAME)‐local.key
53 It is critical that Tripwire files be protected from unauthorized
54 access‐‐an attacker who is able to modify these files can subvert Trip‐
55 wire operation. For this reason, all of the above files are signed
56 using public key cryptography to prevent unauthorized modification.
57 Two separate sets of keys protect critical Tripwire data files. One or
58 both of these key sets is necessary for performing almost every Trip‐
59 wire task.
60 The site key is used to protect files that could be used across several
62 systems. This includes the policy and configuration files. The local
63 key is used to protect files specific to the local machine, such as the
64 Tripwire database. The local key may also be used for signing
65 integrity check reports. See the twadmin(8) man page for more informa‐
66 tion on keys.
67 File Backup
69 To prevent the accidental deletion of important data, Tripwire automat‐
70 ically creates backup files whenever any Tripwire file is overwritten.
71 The existing file will be renamed with a .bak extension, and the new
72 version of the file will take its place. Only one backup copy for each
73 filename can exist at any time. If a backup copy of a file already
74 exists, the older backup file will be deleted and replaced with the
75 newer one.
76 File backup is an integral part of Tripwire, and cannot be removed or
78 changed.
79
81 This man page describes Tripwire 2.4.1.
82
84 Tripwire, Inc.
85
87 Permission is granted to make and distribute verbatim copies of this
88 man page provided the copyright notice and this permission notice are
89 preserved on all copies.
90 Permission is granted to copy and distribute modified versions of this
92 man page under the conditions for verbatim copying, provided that the
93 entire resulting derived work is distributed under the terms of a per‐
94 mission notice identical to this one.
95 Permission is granted to copy and distribute translations of this man
97 page into another language, under the above conditions for modified
98 versions, except that this permission notice may be stated in a trans‐
99 lation approved by Tripwire, Inc.
100 Copyright 2000 Tripwire, Inc. Tripwire is a registered trademark of
102 Tripwire, Inc. in the United States and other countries. All rights
103 reserved.
104
106 twintro(8), tripwire(8), twadmin(8), twprint(8), siggen(8), twcon‐
107 fig(4), twpolicy(4)
108 1 July 2000 TWFILES(5)