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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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