Index

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# Index: F

factoring numbers
  6.4.6. RSA and Public Key Cryptography
  6.4.6.3. Strength of RSA
  (see also RSA algorithm)
failed login attempts : (see logging in)
failures, computer
  7.1.1.1. A taxonomy of computer failures
  23.2. Tips on Avoiding Security-related Bugs
  (see also bugs)
fair use laws : 26.4.2. Copyright Infringement
Fast Filesystem (FFS) : 25.2.2.6. Reserved space
FBI (Federal Bureau of Investigation)
  26.2.2. Federal Jurisdiction
  F.3.2. Federal Bureau of Investigation (FBI)
fbtab file : 17.3.21.1. /etc/fbtab and /etc/logindevperm
Federal Information Processing Standard (FIPS) : 6.4.2. Summary of Public Key Systems
federal law enforcement
  26.2.2. Federal Jurisdiction
  26.2.3. Federal Computer Crime Laws
FFS (Fast File System) : 25.2.2.6. Reserved space
fgets function : 23.1.1. The Lesson of the Internet Worm
fiber optic cables : (see cables, network)
File Handles : 20.1.2. File Handles
File Transfer Protocol : (see FTP)
filenames, attacks via : 11.5.1.4. Filename attacks
files : 5.1. Files
  automatic directory listings : 18.2.2.2. Additional configuration issues
  backing up
    7. Backups
    7.4.7. inode Modification Times
    automatic system for
      7.3.2. Building an Automatic Backup System
      18.2.3.5. Beware stray CGI scripts
    critical files
      7.3. Backing Up System Files
      7.3.2. Building an Automatic Backup System
    prioritizing : 7.3.1. What Files to Back Up?
  changing owner of : 5.7. chown: Changing a File's Owner
  context-dependent (CDFs)
    5.9.2. Context-Dependent Files
    24.4.1.7. Hidden files and directories
  core : C.4. The kill Command
  descriptors : 23.2. Tips on Avoiding Security-related Bugs
  detecting changes to
    9.2. Detecting Change
    9.3. A Final Note
  device : 5.6. Device Files
  downloading, logs of
    10.3.3. xferlog Log File
    10.3.5. access_log Log File
  finding all SUID/SGID
    5.5.4. Finding All of the SUID and SGID Files
    5.5.4.1. The ncheck command
  format, monitoring : 8.2. Monitoring File Format
  group-writable : 11.6.1.2. Writable system files and directories
  hidden : 24.4.1.7. Hidden files and directories
  hidden space : 25.2.2.7. Hidden space
  history : 10.4.1. Shell History
  immutable : 9.1.1. Immutable and Append-Only Files
  integrity of : (see integrity)
  intruder's changes to : 24.4.1.1. Changes in file contents
  locating largest : 25.2.2.1. Disk-full attacks
  locking : 23.2. Tips on Avoiding Security-related Bugs
  log : (see log files)
  mail sent directly to : 15.7. Early Security Problems with UUCP
  modification times of
    5.1.2. Inodes
    5.1.5. File Times
    7.4.7. inode Modification Times
    9.2.2. Checklists and Metadata
  network configuration : 10.4.3. Network Setup
  permissions to : (see permissions)
  remote access to
    15.4.1. USERFILE: Providing Remote File Access
    15.4.2.1. Some bad examples
  SGID bit on : 5.5.7. SGID Bit on Files (System V UNIX Only): Mandatory Record Locking
  startup
    11.5.2. Start-up File Attacks
    11.5.2.7. Other initializations
  system database : 1.2. What Is an Operating System?
  transfering between systems : 15.1.1. uucp Command
  types of : 5.1.6. Understanding File Permissions
  unowned : 24.4.1.8. Unowned files
  on Web servers : (see Web servers)
  world-writable : 11.6.1.1. World-writable user files and directories
  zero-filled bytes in : 7.4. Software for Backups
filesystems : (see directories)
filter files (mail) : 11.5.2.5. .forward, .procmailrc
filters, air : 12.2.1.3. Dust
find command
  5.5.4. Finding All of the SUID and SGID Files
  11.5.1.4. Filename attacks
  -H option : 5.9.2. Context-Dependent Files
  -ls option : 9.2.2.1. Simple listing
  -size option : 25.2.2.1. Disk-full attacks
  -H option : 24.4.1.7. Hidden files and directories
  -print option : 5.5.4. Finding All of the SUID and SGID Files
  type -f option : 5.5.4. Finding All of the SUID and SGID Files
  -xdev option : 5.5.4. Finding All of the SUID and SGID Files
finger command
  8.1.3. Accounts That Run a Single Command
  10.1.1. lastlog File
  10.1.2. utmp and wtmp Files
  15.3.1. Assigning Additional UUCP Logins
  15.4.3. L.cmds: Providing Remote Command Execution
  17.3.4.3. Improving the security of Berkeley sendmail V8
  17.3.8. finger (TCP Port 79)
  17.3.8.3. Replacing finger
  21.4.4.1. Creating an ftpout account to allow FTP without proxies.
  23.1.1. The Lesson of the Internet Worm
  24.2.1. Catching One in the Act
  24.2.4.2. How to contact the system administrator of a computer you don't know
  (see also Internet, Worm program)
  disabling : 17.3.8.2. Disabling finger
FIPS (Federal Information Processing Standard) : 6.4.2. Summary of Public Key Systems
fired employees : 13.2.6. Departure
fires
  12.2.1.1. Fire
  12.2.1.2. Smoke
  12.4.1.1. Fire hazards
  extinguishers and radio transmitters : 12.2.1.8. Electrical noise
firewalls
  8.8.9. Account Names Revisited: Using Aliases for Increased Security
  17.2. Controlling Access to Servers
  21. Firewalls
  21.4.2. Electronic Mail
  21.5. Special Considerations
  checklist for : A.1.1.20. Chapter 21: Firewalls
  mailing list for
    E.1.3.1. Academic-Firewalls
    E.1.3.7. Firewalls
  nameservers and : 17.3.6.2. DNS nameserver attacks
  for NIS sites : 19.4.5. Unintended Disclosure of Site Information with NIS
  portmapper program and : 19.2.1. Sun's portmap/rpcbind
  for specific network services : G. Table of IP Services
FIRST teams
  24.6. Resuming Operation
  E.3.3. FIRST
Fitzgerald, Tom : 22.5. UDP Relayer
flooding
  client : 16.3.2. Security and Nameservice
  messages : 25.3.2. Message Flooding
  servers with requests : 25.3.1. Service Overloading
  water : (see water)
floors, raised : 12.2.3.1. Raised floors and dropped ceilings
floppy disks : (see backups; media)
folders : (see directories)
FollowSymLinks option : 18.3.2. Commands Within the <Directory> Block
food : 12.2.2.1. Food and drink
fork command
  23.2. Tips on Avoiding Security-related Bugs
  25.2.1.1. Too many processes
  C.2. Creating Processes
format
  file, monitoring : 8.2. Monitoring File Format
  redoing as destructive attack : 25.1. Destructive Attacks
  USERFILE entries : 15.4.1.3. Format of USERFILE entry without system name
.forward file
  11.5.2.5. .forward, .procmailrc
  21.4.2. Electronic Mail
  24.4.1.6. Changes to startup files
Frame Ground (FG) : 14.3. The RS-232 Serial Protocol
fraud
  14.4.1. One-Way Phone Lines
  26.2.2. Federal Jurisdiction
fscanf function : 23.2. Tips on Avoiding Security-related Bugs
fsck program
  24.4.1.7. Hidden files and directories
  25.2.2.8. Tree-structure attacks
fsirand command : 20.4.8. Use fsirand
fstab file
  11.1.2. Back Doors and Trap Doors
  19.3.2.5. Mounting a secure filesystem
FTP (File Transfer Protocol)
  17.3.2. (FTP) File Transfer Protocol (TCP Ports 20 and 21)
  17.3.2.7. Allowing only FTP access
  anonymous
    4.1. Users and Groups
    17.3.2.1. Using anonymous FTP
    17.3.2.6. Setting up anonymous FTP with the standard UNIX FTP server
  anonymous
    and HTTP : 18.2.4.1. Beware mixing HTTP with anonymous FTP
  ~ftp/bin directory : 17.3.2.6. Setting up anonymous FTP with the standard UNIX FTP server
  ~ftp/etc directory : 17.3.2.6. Setting up anonymous FTP with the standard UNIX FTP server
  ~ftp/pub directory : 17.3.2.6. Setting up anonymous FTP with the standard UNIX FTP server
  logging transferred files : 10.3.3. xferlog Log File
  passive mode
    17.3.2.2. Passive vs. active FTP
    17.3.2.3. FTP passive mode
  setting up server
    17.3.2.4. Setting up an FTP server
    17.3.2.6. Setting up anonymous FTP with the standard UNIX FTP server
ftp account : (see anonymous FTP)
ftpd server
  8.4.2. Changing the Account's Login Shell
  11.1.2. Back Doors and Trap Doors
  17.3.2. (FTP) File Transfer Protocol (TCP Ports 20 and 21)
  17.3.2.4. Setting up an FTP server
  for backups : 7.4.5. Backups Across the Net
  security hole : 6.5.2. Using Message Digests
  UUCP enabled on : 15.8. UUCP Over Networks
ftpout account, firewalls : 21.4.4.1. Creating an ftpout account to allow FTP without proxies.
ftpusers file : 17.3.2.5. Restricting FTP with the standard UNIX FTP server
ftruncate system call : 5.1.7. File Permissions in Detail
full backups : 7.1.3. Types of Backups
function keys : 12.3.4.5. Function keys
functionality, add-on : 1.4.3. Add-On Functionality Breeds Problems

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