barcode generator in vb.net 2005 7: Auditing Unix and Linux Operating Systems in Software

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7: Auditing Unix and Linux Operating Systems
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home directory they reside and should be writable only by that account If a user can write to another user s authorized_keys2 file, the user could set up additional trust relationships for the other user s account For many versions of Unix, trusted access via SSH keys will not work unless permissions on these files and directories are set to 600 Ensure that all id_rsa files on the system and related ssh subdirectories are secured properly (using the ls l command) The files should be owned by the account in whose home directory they reside and should be readable and writable only by that account If a user can read another user s private key file, that user could use that information to spoof the other user and access trust relationships that user has established with other servers Passphrases can also be used to restrict further what activities can be performed using this form of trusted access Talk with your administrator to determine whether passphrases are being used and to what extent If they are being used, it will be important that you review the strength of and controls over those passphrases Review processes used by the system administrators to detect and review any new trusted access established on the system They should detect and review any new authorized_keys2 files or entries Additional controls can be established over this function, depending on the version of SSH being used, such as disallowing key-based authentication or requiring any keys that are to be used for user authentication to be stored in a centralized location (instead of in various accounts home directories) Talk with the administrator and perform research to determine what features are available and have been enabled in your environment
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30 If anonymous FTP is enabled and genuinely needed, ensure that it is locked down properly
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Anonymous FTP allows any user on the network to get files from or send files to restricted directories It does not require the use of a password, so it should be controlled properly
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To determine whether anonymous FTP is enabled, examine the contents of the password file(s) If you see an ftp account in the password file and the FTP service is enabled, then anonymous FTP is available on the system Once an anonymous FTP user has logged in, he or she is restricted only to those files and directories within the ftp account s home directory, which is specified in ftp s password entry (we ll assume that the home directory is at /ftp for this step) The ftp account should be disabled in the password file and should not have a valid shell Ensure that the FTP directory (/ftp) is owned and writable only by root and not by ftp When using anonymous FTP, the user becomes user ftp If ftp owns its own files and directories, anyone using anonymous FTP could alter the file permissions of anything owned by ftp This can be determined by performing the ls -l command on the ftp home directory Ftp should own only the /ftp/pub directory
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Examine the permissions of the /ftp directory and the subdirectories (by using the ls -l command) The /ftp/pub directory should have the sticky bit set so that people cannot delete files in the directory The /ftp directory and its other subdirectories should be set with permissions at least as restrictive as dr-xr-xr-x so that users can t delete and replace files within the directories Ensure that the /ftp/etc/passwd file contains no user entries (just ftp ) or passwords (by performing the more command on the file) Otherwise, anyone on the network can see usernames on the server and use those for attacking the system It should not allow group or world write permissions (ls -l /ftp/etc/passwd) Other files outside of the /ftp/pub directory should not allow group or world write access (verify by using the ls -l command) Attackers could transfer large files to the /ftp directories and fill up the file system (to commit a denial-of-service attack and/or prevent audit logs from being written) The system administrator should consider placing a file quota on the ftp user or placing the /ftp home directory on a separate file system
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