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You should then sign the Sendmail public key that you just imported. In this example, the email address was used for the key name.
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gpg --sign-key sendmail@Sendmail.ORG
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You could also check the fingerprint of the key for added verification. You would then download both the compressed archive and the digital signature files. Decompress the .gz file to the .tar file with gunzip. Then, with the gpg command and the -verify option, use the digital signature in the .sig file to check the authenticity and integrity of the software compressed archive.
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# gpg --verify sendmail.8.12.0.tar.sig sendmail.8.12.0.tar gpg: Signature made Fri 07 Sep 2001 07:21:30 PM PDT using RSA key ID CC374F2D gpg: Good signature from "Sendmail Signing Key/2001 <sendmail@Sendmail.ORG>"
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You could also just specify the signature file and gpg will automatically search for and select a file of the same name, but without the .sig or .asc extension.
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# gpg --verify sendmail.8.12.0.tar.sig
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In the future, when you download any software from the Sendmail site that uses this key, you just have to perform the --verify operation. Bear in mind though that different software packages from the same site may use different keys. You would have to make sure that you have imported and signed the appropriate key for the software you are checking.
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When someone breaks into a system, they will usually try to gain control by making their own changes to system administration files such as password files. They could create their own user and password information, allowing them access at any time, or simply change the root user password. They could also replace entire programs, such as the login program, with their own version. One method of detecting such actions is to use an integrity checking tool like Tripwire to detect any changes to system administration files. An integrity checking tool works by first creating a database of unique identifiers for each file or program to be checked. These can include features such as permissions and file size, but also, more importantly, checksum numbers generated by encryption algorithms from the file's contents. For example, in Tripwire, the default identifiers are checksum numbers created by algorithms like the MD5 modification digest algorithm and Snefru (Xerox secure hash algorithm). An encrypted value that provides such a unique identification of a file is known as a signature. In effect, a signature provides an accurate snapshot of the contents of a file. Files and programs are then periodically checked by generating their identifiers again and matching them with those in the database. Tripwire will generate signatures of the current files and programs and match them against the values previously generated for its database. Any differences are noted as changes to the file, and Tripwire then notifies you of the changes. Note AIDE (Advanced Intrusion Detection Environment) is an alternative to Tripwire. It provides easy configuration and detailed reporting. The Linux version of Tripwire is freely available as an open source product distributed under the GPL license. Tripwire also provides commercial versions for other operating systems. You can find out more about Tripwire at www.tripwire.com, and download the most recent release from www.tripwire.org. Tripwire is included with Red Hat and is discussed in the Red Hat Reference Manual. Detailed documentation is provided in a series of Man pages. tripwire discusses the tripwire command and its options. twpolicy describes in detail how Tripwire rules and directives work in the twpol.txt file. twconfig covers the configuration variables set in twcfg.txt. twfiles lists the different directories that Tripwire uses such as the /var/lib/tripwire/report directory that holds Tripwire check results. twadmin describes the usage of the twadmin command to create and display the policy (tw.pol) and configuration (tw.cfg) files. Note Tripwire is not included in the Publisher's Edition. You can download it from the Red Hat FTP site. You should install Tripwire when your system is in a secure state-as in not connected to any network. On Red Hat, Tripwire is installed as part of the standard installation. However, you
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should remain disconnected from a network after the installation while you configure and initialize Tripwire. Using Tripwire is a continual process of checking the Tripwire database for changes, making any configuration or policy changes that may be needed, and reinitializing the Tripwire database to reflect valid changes. The commands and files used in the Red Hat installation of Tripwire are listed in Table 6-3. Note You can also check your log files for any suspicious activity. See 28 for a discussion on system logs. /var/log/messages in particular is helpful in checking for critical events such as user logins, FTP connections, and superuser logins.
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