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Index: A

ACLs

Practical UNIX & Internet Security, 5.2.5. Access Control Lists
Practical UNIX & Internet Security, 5.2.5.1. AIX Access Control Lists
Practical UNIX & Internet Security, 5.2.5.2. HP-UX access control lists
Practical UNIX & Internet Security, 17.3.13. Network News Transport Protocol (NNTP) (TCP Port

anonymous FTP : Practical UNIX & Internet Security, 17.3.2.1. Using anonymous FTP

employee access, monitoring : Practical UNIX & Internet Security, 13.2.4. Auditing Access

/etc/exports file : Practical UNIX & Internet Security, 20.2.1.1. /etc/exports

fail safety and : Building Internet Firewalls, 3.5. Fail-Safe Stance

Internet servers : Practical UNIX & Internet Security, 17.2. Controlling Access to Servers

least privilege : Building Internet Firewalls, 3.1. Least Privilege

levels of

Practical UNIX & Internet Security, 19.5.4. Using NIS+
TCP/IP Network Administration, 9.1.2.1. The share command

logging : (see logs/logging)

monitoring at choke point : Building Internet Firewalls, 3.3. Choke Point

to networks : Building Internet Firewalls, 1.3.4. Network Security

non-citizens : Practical UNIX & Internet Security, 26.4.1. Munitions Export

physical : Practical UNIX & Internet Security, 12.2.3. Physical Access

restricted filesystems

Practical UNIX & Internet Security, 8.1.5. Restricted Filesystem
Practical UNIX & Internet Security, 8.1.5.2. Checking new software

restricting data availability : Practical UNIX & Internet Security, 2.1. Planning Your Security Needs

services to place under, listed : TCP/IP Network Administration, 12.5.1. wrapper

software for : TCP/IP Network Administration, 12.5. Access Control

tradition of open : Practical UNIX & Internet Security, 1.4.1. Expectations

to unbuilt bastion host : Building Internet Firewalls, 5.8. Building a Bastion Host

USERFILE (UUCP)

Practical UNIX & Internet Security, 15.4.1. USERFILE: Providing Remote File Access
Practical UNIX & Internet Security, 15.4.2.1. Some bad examples

Web server files

Practical UNIX & Internet Security, 18.2.2.2. Additional configuration issues
Practical UNIX & Internet Security, 18.3. Controlling Access to Files on Your Server
Practical UNIX & Internet Security, 18.3.3. Setting Up Web Users and Passwords

X Window System

Practical UNIX & Internet Security, 17.3.21.2. X security
Practical UNIX & Internet Security, 17.3.21.3. The xhost facility

access() : Practical UNIX & Internet Security, 23.2. Tips on Avoiding Security-related Bugs

access control lists (ACLs)

Practical UNIX & Internet Security, 5.2.5. Access Control Lists
Practical UNIX & Internet Security, 5.2.5.2. HP-UX access control lists
errors in : Practical UNIX & Internet Security, 5.2.5.1. AIX Access Control Lists
NNTP with : Practical UNIX & Internet Security, 17.3.13. Network News Transport Protocol (NNTP) (TCP Port

access router : (see exterior routers)

access.conf file : Practical UNIX & Internet Security, 18.3.1. The access.conf and .htaccess Files

access_log file

Practical UNIX & Internet Security, 10.3.5. access_log Log File
Practical UNIX & Internet Security, 18.4.2. Eavesdropping Through Log Files
with refer_log file : Practical UNIX & Internet Security, 18.4.2. Eavesdropping Through Log Files

accidents

Building Internet Firewalls, 1.2.3. Stupidity and Accidents
Practical UNIX & Internet Security, 12.2.2. Preventing Accidents
(see also natural disasters)

accounting process

Practical UNIX & Internet Security, 10.2. The acct/pacct Process Accounting File
Practical UNIX & Internet Security, 10.2.3. messages Log File
(see also auditing)

accounts : Practical UNIX & Internet Security, 3.1. Usernames

aliases for : Practical UNIX & Internet Security, 8.8.9. Account Names Revisited: Using Aliases for Increased

changing login shell

Practical UNIX & Internet Security, 8.4.2. Changing the Account's Login
Practical UNIX & Internet Security, 8.7.1. Integrating One-time Passwords with UNIX

created by intruders : Practical UNIX & Internet Security, 24.4.1. New Accounts

default : Practical UNIX & Internet Security, 8.1.2. Default Accounts

defense checklist : Practical UNIX & Internet Security, A.1.1.7. Chapter 8: Defending Your Accounts

dormant

Practical UNIX & Internet Security, 8.4. Managing Dormant Accounts
Practical UNIX & Internet Security, 8.4.3. Finding Dormant Accounts

expiring old : Practical UNIX & Internet Security, 8.4.3. Finding Dormant Accounts

group : Practical UNIX & Internet Security, 8.1.6. Group Accounts

importing to NIS server

Practical UNIX & Internet Security, 19.4.1. Including or excluding specific accounts:
Practical UNIX & Internet Security, 19.4.4.2. Using netgroups to limit the importing of accounts

Joes

Practical UNIX & Internet Security, 3.6.2. Smoking Joes
Practical UNIX & Internet Security, 8.8.3.1. Joetest: a simple password cracker

locking automatically : Practical UNIX & Internet Security, 3.3. Entering Your Password

logging changes to : Practical UNIX & Internet Security, 10.7.2.1. Exception and activity reports

managing : Building Internet Firewalls, 12.1.2. Managing Your Accounts

multiple, same UID : Practical UNIX & Internet Security, 4.1.2. Multiple Accounts with the Same UID

names for : (see usernames)

restricted, with rsh : Practical UNIX & Internet Security, 8.1.4.5. How to set up a restricted account with rsh

restricting FTP from : Practical UNIX & Internet Security, 17.3.2.5. Restricting FTP with the standard UNIX FTP server

running single command : Practical UNIX & Internet Security, 8.1.3. Accounts That Run a Single Command

without passwords : Practical UNIX & Internet Security, 8.1.1. Accounts Without Passwords

acct file : Practical UNIX & Internet Security, 10.2. The acct/pacct Process Accounting File

acctcom program

Practical UNIX & Internet Security, 10.2. The acct/pacct Process Accounting File
Practical UNIX & Internet Security, 10.2.2. Accounting with BSD

ACEs : (see ACLs)

ACK (acknowledgment) bit

Building Internet Firewalls, 6.3.1.3. TCP layer
Building Internet Firewalls, C.6.2. Transmission Control Protocol
Practical UNIX & Internet Security, 16.2.4.2. TCP
TCP/IP Network Administration, 1.6.2. Transmission Control Protocol
TCP connections and : Building Internet Firewalls, 6.3.3.1. TCP
with SMTP : Building Internet Firewalls, 8.1.1.4. Packet filtering characteristics of

ACKD command, in POP : TCP/IP Network Administration, 3.4.2. Post Office Protocol

Acknowledgment Number field : TCP/IP Network Administration, 1.6.2. Transmission Control Protocol

acledit command : Practical UNIX & Internet Security, 5.2.5.1. AIX Access Control Lists

aclget, aclput commands : Practical UNIX & Internet Security, 5.2.5.1. AIX Access Control Lists

ACLs (access control lists)

Practical UNIX & Internet Security, 5.2.5. Access Control Lists
Practical UNIX & Internet Security, 5.2.5.2. HP-UX access control lists
errors in : Practical UNIX & Internet Security, 5.2.5.1. AIX Access Control Lists
NNTP with : Practical UNIX & Internet Security, 17.3.13. Network News Transport Protocol (NNTP) (TCP Port

ACM (Association for Computing Machinery) : Practical UNIX & Internet Security, F.1.1. Association for Computing Machinery (ACM)

active FTP : Practical UNIX & Internet Security, 17.3.2.2. Passive vs. active FTP

activity logs : (see logs/logging)

aculog file : Practical UNIX & Internet Security, 10.3.1. aculog File

adaptive modems : (see modems)

adaptive protocol value : TCP/IP Network Administration, 6.4.1. slattach

adb debugger

Practical UNIX & Internet Security, 19.3.1.3. Setting the window
Practical UNIX & Internet Security, C.4. The kill Command

add-on functionality : Practical UNIX & Internet Security, 1.4.3. Add-On Functionality Breeds Problems

addheader() : sendmail, 20.3. Alphabetized V8.8 Subroutines

adding

to classes : sendmail, 38.2.2. Add to a Class with .C
to files : (see appending to files)
message header lines : sendmail, 20.3. Alphabetized V8.8 Subroutines

"Address already in use" message : sendmail, 4.1.1.4. If you forget to kill the daemon

Address Resolution Protocol : (see ARP)

"ADDRESS *to" structure : sendmail, 20.1.1. Arguments Passed to checkcompat()

addresses

sendmail, 8. Addresses and Rules

sendmail, 8.2. Why Rules?

TCP/IP Network Administration, 1.1.1. TCP/IP Features

TCP/IP Network Administration, 1.7. Application Layer

TCP/IP Network Administration, 2.1. Addressing, Routing, and Multiplexing

(see also email)

(see also IP addresses)

(see also leases on addresses)

(see also rule sets; rules)

% character in

sendmail, 17.1.5. The % Hack
sendmail, 21.5.1. Offsite MX Hosts

accepted by router : Building Internet Firewalls, 6.5. Conventions for Packet Filtering

accepting old-style lists : sendmail, 13.2.7. Accept Old-Style Lists of Addresses

address depletion : Building Internet Firewalls, C.9.1. Address Depletion

address-based authentication : Building Internet Firewalls, 2.13. Window Systems

address-testing mode : sendmail, 8.3. Rule Sets

allocating : TCP/IP Network Administration, 3.6.1. Dynamic Host Configuration Protocol

assigning

in blocks : TCP/IP Network Administration, 4.2.1.1. Assigning host addresses

in contiguous blocks

TCP/IP Network Administration, 2.2.2. Classless IP Addresses
TCP/IP Network Administration, B.11. The Aggregate Statements

in DHCP : TCP/IP Network Administration, 3.6.1. Dynamic Host Configuration Protocol

broadcast

Building Internet Firewalls, C.9. The IP Address
TCP/IP Network Administration, 2.2.2.1. Final notes on IP addresses
TCP/IP Network Administration, 2.6. Address Resolution
TCP/IP Network Administration, 4. Getting Started
TCP/IP Network Administration, 6.1. The ifconfig Command
TCP/IP Network Administration, 6.1.2. Checking the Interface with ifconfig
limited : TCP/IP Network Administration, 3.6. Bootstrap Protocol
setting : TCP/IP Network Administration, 6.1.4. Setting the Broadcast Address
specifying : TCP/IP Network Administration, 4.2.2. Defining the Subnet Mask

checking with check_compat : sendmail, 29.10.4. The check_compat Rule Set

CIDR : Practical UNIX & Internet Security, 16.2.1.3. CIDR addresses

classes of

TCP/IP Network Administration, 1.7. Application Layer
TCP/IP Network Administration, 2.2.1. Address Classes
TCP/IP Network Administration, 4.2.1. Obtaining an IP Address
class rules : TCP/IP Network Administration, 7.4.1.1. Running RIP with routed

commands embedded in : Practical UNIX & Internet Security, 15.7. Early Security Problems with UUCP

converting : TCP/IP Network Administration, 10.6.3. The Set Ruleset Command

DECnet : sendmail, 31.10. Alphabetized Reference

filtering by : Building Internet Firewalls, 6.6. Filtering by Address

gateway : (see gateways)

getting in pppd : TCP/IP Network Administration, 6.3.2. Dial-Up PPP

host addresses

sendmail, 31.10. Alphabetized Reference
TCP/IP Network Administration, 2.2.1. Address Classes
assigning : TCP/IP Network Administration, 4.2.1.1. Assigning host addresses

Internet

Practical UNIX & Internet Security, 16.2.1. Internet Addresses
Practical UNIX & Internet Security, 16.2.1.3. CIDR addresses
sendmail, 17.1.3. Internet Addresses
TCP/IP Network Administration, 10.7.1. Modifying Local Information

looking up with DNS : sendmail, 21.2.3. Look Up Addresses for Delivery

loopback : Building Internet Firewalls, C.9. The IP Address

mask, written in hexadecimal : TCP/IP Network Administration, 6.1.2. Checking the Interface with ifconfig

masquerading : (see masquerading)

mixtures of in DHCP : TCP/IP Network Administration, 3.6.1. Dynamic Host Configuration Protocol

multiple : TCP/IP Network Administration, 8.2.1. The Resolver Configuration File

null (empty)

sendmail, 10.3. Missing Addresses
sendmail, 17.1.1.3. Handle null address
sendmail, 30.8. Alphabetized F= Flags

numeric : TCP/IP Network Administration, 3.1. Names and Addresses

parsing : sendmail, 38.5.5. Parse an Address with /parse

preprocessing : (see rule set 3)

processing

by several rewrite rules : TCP/IP Network Administration, 10.6.2. Transforming the Address
verifying : TCP/IP Network Administration, 10.8. Testing sendmail.cf

qualified

sendmail, 16.5. Qualify All Addresses?
sendmail, D.3. K Command's -d switch

recipient

sendmail, 6.3. The local Delivery Agent
sendmail, 23.9. The qf File Internals
sendmail, 29.10.4. The check_compat Rule Set
sendmail, 31.10. Alphabetized Reference
TCP/IP Network Administration, 10.6.3. The Set Ruleset Command

records of : TCP/IP Network Administration, C.3.1.3. Address record

reserved

TCP/IP Network Administration, 2.2.1. Address Classes
TCP/IP Network Administration, 2.2.2.1. Final notes on IP addresses

resolution of : TCP/IP Network Administration, 2.6. Address Resolution

route addresses

sendmail, 17.1.5. The % Hack
sendmail, 21.5.1. Offsite MX Hosts
sendmail, 29.4.3. Handling Routing Addresses
sendmail, 30.8. Alphabetized F= Flags
sendmail, 34.8. Alphabetized Reference

sender

sendmail, 6.3. The local Delivery Agent
sendmail, 11.1. Flow of the Sender's Address
sendmail, 23.4. Printing the Queue
sendmail, 23.9. The qf File Internals
sendmail, 31.10. Alphabetized Reference
sendmail, 36.7. Alphabetized Reference
TCP/IP Network Administration, 10.6.3. The Set Ruleset Command
TCP/IP Network Administration, 10.8.1. Testing Rewrite Rules
(see also $f macro; $g macro; rule set 1)
default format of : sendmail, 31.10. Alphabetized Reference
genericstable feature : sendmail, 19.6. Alphabetized m4 Macros
hostname part : (see $s macro)
rewriting : sendmail, 11.4.1. Rewrite the Lone Username
testing with check_compat : sendmail, 29.10.4. The check_compat Rule Set

sending host's : sendmail, 20.1.2. Global Variables

separate BITNET : sendmail, 19.6. Alphabetized m4 Macros

spoofing

TCP/IP Network Administration, 4.2.1. Obtaining an IP Address
TCP/IP Network Administration, 5.2. Linux Kernel Configuration

starting with | : sendmail, 3.2.2. Delivery Through a Program

stripping quotation marks from

sendmail, 30.8. Alphabetized F= Flags
sendmail, 33.3.4.9. -q don't strip quotes from key (V8.7 and above)

timing out : TCP/IP Network Administration, 3.6.1. Dynamic Host Configuration Protocol

tokenizing : (see tokenization)

transformation rules : sendmail, 5.3.3. Rules

translating : TCP/IP Network Administration, 5.2. Linux Kernel Configuration

undeliverable : sendmail, 4.1.4. Verify Mode (-bv)

UUCP : sendmail, 17.1.4. UUCP Addresses

X.400 standard : sendmail, 25.5.6. X.400 Addresses

Adleman, Leonard

Practical UNIX & Internet Security, 6.4.2. Summary of Public Key Systems
Practical UNIX & Internet Security, 6.4.6. RSA and Public Key Cryptography

admin alias : TCP/IP Network Administration, 10.3. sendmail Aliases

.Admin directory : Practical UNIX & Internet Security, 10.3.4. uucp Log Files

administration : (see system administration)

admintool

TCP/IP Network Administration, 9.2.2. Solaris Line Printer Service
TCP/IP Network Administration, 12.2.1. The Shadow Password File

adult material : Practical UNIX & Internet Security, 26.4.5. Pornography and Indecent Material

Advanced Network & Services (ANS) : Practical UNIX & Internet Security, F.3.4.2. ANS customers

adventurous users, supporting : TCP/IP Network Administration, 9.7.2. IMAP Server

AFCERT : Practical UNIX & Internet Security, F.3.4.41. U.S. Air Force

AFS (Andrew File System)

Building Internet Firewalls, 2.12. Network File Systems
Building Internet Firewalls, B.5.5. Andrew File System

aftpd server : Practical UNIX & Internet Security, 17.3.2.4. Setting up an FTP server

agent (user) : Practical UNIX & Internet Security, 4.1. Users and Groups

agent_log file : Practical UNIX & Internet Security, 18.4.2. Eavesdropping Through Log Files

aggregate statements (in gated) : TCP/IP Network Administration, B.11. The Aggregate Statements

aging : (see expiring)

air ducts : Practical UNIX & Internet Security, 12.2.3.2. Entrance through air ducts

air filters : Practical UNIX & Internet Security, 12.2.1.3. Dust

Air Force Computer Emergency Response Team (AFCERT) : Practical UNIX & Internet Security, F.3.4.41. U.S. Air Force

AIX

Practical UNIX & Internet Security, 3.3. Entering Your Password
Practical UNIX & Internet Security, 8.7.1. Integrating One-time Passwords with UNIX
access control lists : Practical UNIX & Internet Security, 5.2.5.1. AIX Access Control Lists
tftp access : Practical UNIX & Internet Security, 17.3.7. Trivial File Transfer Protocol (TFTP) (UDP Port 69)
trusted path : Practical UNIX & Internet Security, 8.5.3.1. Trusted path

alarms

TCP/IP Network Administration, 11.9. Simple Network Management Protocol
(see also detectors)

algorithms

back-off : TCP/IP Network Administration, 9.4. A BOOTP Server
Dijkstra Shortest Path First (SPF) : TCP/IP Network Administration, 7.4.3. Open Shortest Path First
distance-vector : TCP/IP Network Administration, 7.4. Interior Routing Protocols

aliases/aliasing

Practical UNIX & Internet Security, 8.8.9. Account Names Revisited: Using Aliases for Increased

Practical UNIX & Internet Security, 11.1.2. Back Doors and Trap Doors

Practical UNIX & Internet Security, 11.5.3.3. /usr/lib/aliases, /etc/aliases,

sendmail, 1.3.3. Aliases and Mailing Lists

sendmail, 3.1.1. The Aliases File

sendmail, 24. Aliases

TCP/IP Network Administration, 2.7.2. Port Numbers

AUTO_NIS_ALIASES macro : sendmail, 18.8. Alphabetized Reference

decode : Practical UNIX & Internet Security, 17.3.4.2. Using sendmail to receive email

email : Practical UNIX & Internet Security, 17.3.4. Simple Mail Transfer Protocol (SMTP) (TCP Port 25)

file : TCP/IP Network Administration, 10.3. sendmail Aliases

processing addresses against : TCP/IP Network Administration, 10.6.3. The Set Ruleset Command

for hostnames : TCP/IP Network Administration, 8.3.6. The named.hosts File

internal mailing lists : sendmail, 25.1. Internal Mailing Lists

postmaster : (see postmaster alias)

preventing : sendmail, 24.6. Prevent Aliasing with -n

rebuilding aliases mode : sendmail, 4.1.3. Rebuild Aliases Mode (-bi)

retired accounts : sendmail, 19.6. Alphabetized m4 Macros

selective expansion : sendmail, D.3. K Command's -d switch

sendmail

sendmail, 34.6.3. Managing Aliases
TCP/IP Network Administration, 10.1. sendmail's Function

special aliases : sendmail, 24.4. Special Aliases

storing aliases as symbol table

sendmail, 24.5.4. No DBM Aliasing
sendmail, 33.8. Alphabetized Reference

testing aliases

sendmail, 4.1.4. Verify Mode (-bv)
sendmail, 24.5.2. Check the Right Side of Aliases

turning off : sendmail, 36.7. Alphabetized Reference

user as LHS of : sendmail, 30.8. Alphabetized F= Flags

using db for alias files : sendmail, C.1. Overview

w class

sendmail, 15.4. Hub Accepts Mail for Client
sendmail, 17.2.1. Is the Host Local?
sendmail, 29.6.3. Delivering to Local Recipient
sendmail, 32.5. Alphabetized Reference

aliases file

Practical UNIX & Internet Security, 11.5.3.3. /usr/lib/aliases, /etc/aliases,

sendmail, 3.1.1. The Aliases File

sendmail, 22.6. The Aliases File

sendmail, 24.1. The aliases(5) File

sendmail, 24.5. The Aliases Database

sendmail, 33.3.4.1. -A append values for duplicate keys (V8.7 and above)

sendmail, 33.8. Alphabetized Reference

sendmail, 36.7. Alphabetized Reference

TCP/IP Network Administration, 3.4.1. Simple Mail Transfer Protocol

TCP/IP Network Administration, 9.3. Network Information Service

in symbol table

sendmail, 24.5.4. No DBM Aliasing
sendmail, 33.8. Alphabetized Reference

AliasFile (A) option

sendmail, 3.1.1. The Aliases File
sendmail, 24.1.1. The aliases(5) file's location
sendmail, 34.8. Alphabetized Reference
TCP/IP Network Administration, 10.5.4. The Set Option Command

AliasWait (a) option : sendmail, 34.8. Alphabetized Reference

Allman, Eric : sendmail, Eric Allman Speaks

allmasquerade feature : sendmail, 19.6. Alphabetized m4 Macros

allmulti parameter : TCP/IP Network Administration, 6.1.5.5. Point-to-point

AllowBogusHELO option : sendmail, 34.8. Alphabetized Reference

AllowOverride option : Practical UNIX & Internet Security, 18.3.2. Commands Within the <Directory>

Almanac package : sendmail, 25.6.2. Almanac

alternate queues : sendmail, 23.7. Process Alternate Queues

alternative multipart subtype : TCP/IP Network Administration, 3.4.3. Multipurpose Internet Mail Extensions

always_add_domain feature : sendmail, 19.6. Alphabetized m4 Macros

ambiguous MX records : sendmail, 21.3.7. Ambiguous MX Records

America Online (AOL) : TCP/IP Network Administration, 4.1. Connected and Non-Connected Networks

American Society for Industrial Security (ASIS) : Practical UNIX & Internet Security, F.1.2. American Society for Industrial Security (ASIS)

ancestor directories : Practical UNIX & Internet Security, 9.2.2.2. Ancestor directories

Andrew File System

TCP/IP Network Administration, 3.7.1. File Sharing
(see AFS)

angle brackets (<>)

sendmail, 10.1. Why Preprocess?

sendmail, 17.1.1.1. At least one <> pair

> option : sendmail, D.5. The > Option

>>> as leading characters : sendmail, 4.2. Verbose (-v)

nested

sendmail, 10.4. Nested Angle Brackets
sendmail, 17.1.1.2. Strip to left of <

null address : (see addresses, null)

ANI schemes : Practical UNIX & Internet Security, 14.6. Additional Security for Modems

animals : Practical UNIX & Internet Security, 12.2.1.7. Bugs (biological)

anlpasswd package : Practical UNIX & Internet Security, 8.8.2. Constraining Passwords

anon option for /etc/exports : Practical UNIX & Internet Security, 20.2.1.1. /etc/exports

anonymous FTP

Building Internet Firewalls, 2.2. File Transfer
Building Internet Firewalls, 5.8.2.4. Which services should you disable?
Building Internet Firewalls, 8.2.1. File Transfer Protocol
Practical UNIX & Internet Security, 4.1. Users and Groups
Practical UNIX & Internet Security, 17.3.2.1. Using anonymous FTP
Practical UNIX & Internet Security, 17.3.2.6. Setting up anonymous FTP with the standard UNIX FTP
TCP/IP Network Administration, 13.2. Anonymous FTP
(see also FTP)
Archie : Building Internet Firewalls, 2.6. Other Information Services
HTTP and : Practical UNIX & Internet Security, 18.2.4.1. Beware mixing HTTP with anonymous FTP
providing : Building Internet Firewalls, 8.2.1.3. Providing anonymous
removing files from : Building Internet Firewalls, 8.2.1.6. Be careful of writable
via proxy server : Building Internet Firewalls, 7.2.2. Using Custom User Procedures for
writing directories in : Building Internet Firewalls, 8.2.1.6. Be careful of writable
wuarchive server : Building Internet Firewalls, 8.2.1.4. Using the wuarchive

ANS (Advanced Network & Services, Inc.) : Practical UNIX & Internet Security, F.3.4.2. ANS customers

ANSI C standards : Practical UNIX & Internet Security, 1.4.2. Software Quality

answer mode : Practical UNIX & Internet Security, 14.3.1. Originate and Answer

answer testing : Practical UNIX & Internet Security, 14.5.3.2. Answer testing

answerback terminal mode : Practical UNIX & Internet Security, 11.1.4. Trojan Horses

ANY query : TCP/IP Network Administration, 11.6. Checking Name Service

APOP (version of POP)

Building Internet Firewalls, 8.1.2. Post Office Protocol
Practical UNIX & Internet Security, 17.3.10. Post Office Protocol (POP) (TCP Ports

apostrophes ('') (expect nothing)

TCP/IP Network Administration, 6.3.3. chat
TCP/IP Network Administration, A.3. chat

"Apparently-From:" header line : sendmail, 35.10. Alphabetized Reference

"Apparently-To:" header line

sendmail, 34.8. Alphabetized Reference
sendmail, 35.10. Alphabetized Reference

appending to files

sendmail, 24.2.2. Delivery to Files
sendmail, 30.8. Alphabetized F= Flags
sendmail, 33.2.1.4. -o append to, don't overwrite the file
(see files)
. line (qf file) : sendmail, 23.9. The qf File Internals
control lines in qf files : sendmail, 23.3.3. Extra Data at End of qf File
.forward file and : sendmail, 25.7.3. Appending to Files
SafeFileEnvironment option : sendmail, 22.8.3.6. The SafeFileEnvironment option

appending to programs : (see programs, delivering to)

Apple CORES (Computer Response Squad) : Practical UNIX & Internet Security, F.3.4.3. Apple Computer worldwide R&D community

Apple Macintosh, Web server on : Practical UNIX & Internet Security, 18.2. Running a Secure Server

AppleTalk network : sendmail, 3.3.3. Other Protocols

applets : Practical UNIX & Internet Security, 11.1.5. Viruses

Application Layer : TCP/IP Network Administration, 1.2. A Data Communications Model

in TCP/IP : TCP/IP Network Administration, 1.7. Application Layer

application-level

encryption

Building Internet Firewalls, 10.5.1. At What Level Do You Encrypt?
Practical UNIX & Internet Security, 16.3.1. Link-level Security

gateways : (see proxy servers/services)

proxy servers : Building Internet Firewalls, 7.3.1. Application-Level Versus Circuit-Level

applications

content type : TCP/IP Network Administration, 3.4.3. Multipurpose Internet Mail Extensions

CGI : (see CGI, scripts)

protocols for : TCP/IP Network Administration, 2.7.2. Port Numbers

widely implemented : TCP/IP Network Administration, 1.7. Application Layer

security issues concerning : TCP/IP Network Administration, 12.3. Application Security

ar program : Practical UNIX & Internet Security, 7.4.2. Simple Archives

Archie

Building Internet Firewalls, 6.8.4. It Should Allow Rules Based on Any

Building Internet Firewalls, 2.6. Other Information Services

Building Internet Firewalls, 8.7.3.3. Providing Archie service to your

TCP/IP Network Administration, 13.3.1. archie

client software : TCP/IP Network Administration, 13.3.1.1. archie client software

configuring : Building Internet Firewalls, 8.7.3. Archie

server

Building Internet Firewalls, 8.7.3.4. Running an Archie server
TCP/IP Network Administration, 13.3.1. archie

archie.internic.net : TCP/IP Network Administration, 13.3.1. archie

architecture, room : Practical UNIX & Internet Security, 12.2.3. Physical Access

archiving information

Practical UNIX & Internet Security, 7.1.1.1. A taxonomy of computer failures
(see also logs/logging)

ARCnet interface : TCP/IP Network Administration, 5.2. Linux Kernel Configuration

area border routers : TCP/IP Network Administration, 7.4.3. Open Shortest Path First

arguments, checking : Practical UNIX & Internet Security, 23.2. Tips on Avoiding Security-related Bugs

arguments, command-line

sendmail, 4. How to Run sendmail

(see also switches, command-line)

specifying for delivery agents

sendmail, 6.2. Define a Mail Delivery Agent
sendmail, 6.3. The local Delivery Agent

time arguments : sendmail, 13.2.2. Limit the Life of Queued Messages

argv[0] : sendmail, 36.1. Alternative argv[0] Names

ARP (Address Resolution Protocol)

TCP/IP Network Administration, 2.6. Address Resolution

TCP/IP Network Administration, 2.8. Summary

TCP/IP Network Administration, 3.5.1. Reverse Address Resolution Protocol

TCP/IP Network Administration, 5.3.1.1. Options

enabling : TCP/IP Network Administration, 6.1.5.2. ARP and trailers

proxy server for : TCP/IP Network Administration, 5.3.1.1. Options

support in BSD : TCP/IP Network Administration, 5.3.1.2. Pseudo-device

table : TCP/IP Network Administration, A.1.1. The dip Script File

viewing contents of : TCP/IP Network Administration, 11.4.2. Troubleshooting with the arp Command

in troubleshooting

TCP/IP Network Administration, 11.2. Diagnostic Tools
TCP/IP Network Administration, 11.4.2. Troubleshooting with the arp Command

ARPA (Advanced Research Projects Agency)

Practical UNIX & Internet Security, 1.3. History of UNIX
(see also UNIX, history of)
Internet Text Messages : TCP/IP Network Administration, 3.4.3. Multipurpose Internet Mail Extensions

arpa/nameser.h file : sendmail, B.1. Status file lines

ARPANET

Practical UNIX & Internet Security, 16.1.1. The InternetWe recommend that readers
TCP/IP Network Administration, 1.1. TCP/IP and the Internet
TCP/IP Network Administration, 1.5.1.1. The datagram
TCP/IP Network Administration, 2.4. Internet Routing Architecture
TCP/IP Network Administration, 6.2. TCP/IP Over a Serial Line

ARPAnet/Grey Book protocols : sendmail, 36.7. Alphabetized Reference

arrow (->), for copying files : TCP/IP Network Administration, 9.6.1. rdist

AS (autonomous systems) : Building Internet Firewalls, C.10. Internet Routing Architecture

AS path : TCP/IP Network Administration, B.10. Control Statements

ASCII data (US) : TCP/IP Network Administration, 3.4.3. Multipurpose Internet Mail Extensions

ASIS (American Society for Industrial Security) : Practical UNIX & Internet Security, F.1.2. American Society for Industrial Security (ASIS)

aspppd.cf file : TCP/IP Network Administration, 6.3.6. Solaris PPP

assert macro : Practical UNIX & Internet Security, 23.2. Tips on Avoiding Security-related Bugs

assessing risks

Practical UNIX & Internet Security, 2.2. Risk Assessment
Practical UNIX & Internet Security, 2.2.2. Review Your Risks
Practical UNIX & Internet Security, 2.5.3. Final Words: Risk Management Means Common Sense

assets, identifying : Practical UNIX & Internet Security, 2.2.1.1. Identifying assets

Assigned Numbers RFC

TCP/IP Network Administration, 2.7. Protocols, Ports, and Sockets
TCP/IP Network Administration, C.3.1.7. Host Information record

ASSIST : Practical UNIX & Internet Security, F.3.4.42. U.S. Department of Defense

Association for Computing Machinery (ACM) : Practical UNIX & Internet Security, F.1.1. Association for Computing Machinery (ACM)

assumptions, making

TCP/IP Network Administration, 11.1.1. Troubleshooting Hints
TCP/IP Network Administration, 11.8. Protocol Case Study

asterisk (*)

in mail queue listing

sendmail, 4.1.2. Show Queue Mode (-bp)
sendmail, 23.4. Printing the Queue

meaning interface not enabled : TCP/IP Network Administration, 6.1.1. Determining the Interface Name

in name field, indicating wildcard character : TCP/IP Network Administration, C.3.1. Standard Resource Records

asymmetric key cryptography : Practical UNIX & Internet Security, 6.4. Common Cryptographic Algorithms

asynchronous modems : (see modems)

Asynchronous PPP Daemon (aspppd) : TCP/IP Network Administration, 6.3.6. Solaris PPP

asynchronous systems : Practical UNIX & Internet Security, 19.2. Sun's Remote Procedure Call (RPC)

Asynchronous Transfer Mode (ATM) : Practical UNIX & Internet Security, 16.2. IPv4: The Internet Protocol Version 4

at program

Practical UNIX & Internet Security, 11.5.3.4. The at program
Practical UNIX & Internet Security, 25.2.1.2. System overload attacks
files run by, in security checks : TCP/IP Network Administration, 12.4.2. Looking for Trouble

at sign (@)

in addresses

sendmail, 17.1.1.3. Handle null address
sendmail, 29.4.5. Focusing for @ Syntax

chacl command with : Practical UNIX & Internet Security, 5.2.5.2. HP-UX access control lists

for current origin : TCP/IP Network Administration, C.3.1. Standard Resource Records

excluding an individual parameter : TCP/IP Network Administration, 9.4. A BOOTP Server

referencing current domain : TCP/IP Network Administration, 8.3.5. The Reverse Domain File

in xhost list : Practical UNIX & Internet Security, 17.3.21.3. The xhost facility

Athena : (see Kerberos authentication system)

atime

Practical UNIX & Internet Security, 5.1.2. Inodes
Practical UNIX & Internet Security, 5.1.5. File Times

ATM (Asynchronous Transfer Mode) : Practical UNIX & Internet Security, 16.2. IPv4: The Internet Protocol Version 4

attackers/intruders

Practical UNIX & Internet Security, 1. Introduction

TCP/IP Network Administration, 1.7. Application Layer

TCP/IP Network Administration, 5.2. Linux Kernel Configuration

(see also finger service)

(see also firewalls)

creating hidden files : Practical UNIX & Internet Security, 24.4.1.7. Hidden files and directories

discovering

Practical UNIX & Internet Security, 24.2. Discovering an Intruder
Practical UNIX & Internet Security, 24.2.6. Anatomy of a Break-in

legal options regarding : Practical UNIX & Internet Security, 26.1. Legal Options After a Break-in

pursuing and capturing : Building Internet Firewalls, 13.3. Pursuing and Capturing the

recovering from : Building Internet Firewalls, 13.1.6. Restore and Recover

responding to

Practical UNIX & Internet Security, 24. Discovering a Break-in
Practical UNIX & Internet Security, 24.7. Damage Control

revealing DNS information to : Building Internet Firewalls, 8.10.4.3. Revealing too much information to

reviewing response strategies : Building Internet Firewalls, 13.4.8. Periodic Review of Plans

slower machines and : Building Internet Firewalls, 5.3.2. How Fast a Machine?

tracking from log files : Practical UNIX & Internet Security, 24.3. The Log Files: Discovering an Intruder's

types of : Building Internet Firewalls, 1.2.2. Types of Attackers

attacks, incidents, threats

TCP/IP Network Administration, 1.7. Application Layer

TCP/IP Network Administration, 4.2.1. Obtaining an IP Address

accidental : Building Internet Firewalls, 1.2.3. Stupidity and Accidents

assessing

Practical UNIX & Internet Security, 2.3.3. Adding Up the Numbers
TCP/IP Network Administration, 12.1.1. Assessing the Threat

back doors

Practical UNIX & Internet Security, 2.5. The Problem with Security Through Obscurity
Practical UNIX & Internet Security, 6.2.3. Cryptographic Strength
Practical UNIX & Internet Security, 11.1. Programmed Threats: Definitions
Practical UNIX & Internet Security, 11.1.2. Back Doors and Trap Doors
Practical UNIX & Internet Security, 11.5. Protecting Yourself
Practical UNIX & Internet Security, 27.1.2. Trusting Trust
in MUDs and IRCs : Practical UNIX & Internet Security, 17.3.23. Other TCP Ports: MUDs and Internet Relay Chat (IRC)

backup-related

Practical UNIX & Internet Security, 7.1.6. Security for Backups
Practical UNIX & Internet Security, 7.1.6.3. Data security for backups

bacteria programs : Practical UNIX & Internet Security, 11.1.7. Bacteria and Rabbits

biological threats : Practical UNIX & Internet Security, 12.2.1.7. Bugs (biological)

broadcast storms : Practical UNIX & Internet Security, 25.3.2. Message Flooding

via CGI scripts : Practical UNIX & Internet Security, 18.2.3.2. Testing is not enough!

changing file owners : Practical UNIX & Internet Security, 5.7. chown: Changing a File's Owner

changing system clock : Practical UNIX & Internet Security, 5.1.5. File Times

code breaking

Practical UNIX & Internet Security, 6.1.1. Code Making and Code Breaking
(see also cryptography)

command channel : Building Internet Firewalls, 8.1. Electronic Mail

commonly attacked accounts : Practical UNIX & Internet Security, 8.1.2. Default Accounts

computer failures : Practical UNIX & Internet Security, 7.1.1.1. A taxonomy of computer failures

contacting service providers about : Building Internet Firewalls, 13.4.4.3. Vendors and service providers

data-driven attacks : Building Internet Firewalls, 8.1. Electronic Mail

decode aliases : Practical UNIX & Internet Security, 17.3.4.2. Using sendmail to receive email

deep tree structures : Practical UNIX & Internet Security, 25.2.2.8. Tree-structure attacks

denial of service

Building Internet Firewalls, 1.2.1.2. Denial of Service

Practical UNIX & Internet Security, 1.5. Role of This Book

Practical UNIX & Internet Security, 17.1.3. The /etc/inetd Program

Practical UNIX & Internet Security, 17.3.21.5. Denial of service attacks under X

Practical UNIX & Internet Security, 25. Denial of Service Attacks and Solutions

Practical UNIX & Internet Security, 25.3. Network Denial of Service Attacks

Practical UNIX & Internet Security, 25.3.4. Clogging

TCP/IP Network Administration, 12.1.1. Assessing the Threat

accidental

Building Internet Firewalls, 1.2.3. Stupidity and Accidents
Practical UNIX & Internet Security, 25.2.5. Soft Process Limits: Preventing Accidental Denial

automatic lockout : Practical UNIX & Internet Security, 3.3. Entering Your Password

checklist for : Practical UNIX & Internet Security, A.1.1.24. Chapter 25: Denial of Service Attacks and Solutions

destructive attacks : Practical UNIX & Internet Security, 25.1. Destructive Attacks

disk attacks

Practical UNIX & Internet Security, 25.2.2. Disk Attacks
Practical UNIX & Internet Security, 25.2.2.8. Tree-structure attacks

inodes : Practical UNIX & Internet Security, 25.2.2.3. Inode problems

internal inetd services : Practical UNIX & Internet Security, 17.1.3. The /etc/inetd Program

on networks

Practical UNIX & Internet Security, 25.3. Network Denial of Service Attacks
Practical UNIX & Internet Security, 25.3.4. Clogging

overload attacks

Practical UNIX & Internet Security, 25.2. Overload Attacks
Practical UNIX & Internet Security, 25.2.5. Soft Process Limits: Preventing Accidental Denial

via syslog : Practical UNIX & Internet Security, 10.5.1. The syslog.conf Configuration File

system overload attacks : Practical UNIX & Internet Security, 25.2.1.2. System overload attacks

X Window System : Practical UNIX & Internet Security, 17.3.21.5. Denial of service attacks under X

detecting, plan for : Building Internet Firewalls, 13.4.1. Planning for Detection

dictionary attacks

Building Internet Firewalls, 10.3.1. One-Time Passwords
Practical UNIX & Internet Security, 8.6.1. The crypt()
TCP/IP Network Administration, 12.2. User Authentication

disposed materials : Practical UNIX & Internet Security, 12.3.3. Other Media

DNS client flooding : Practical UNIX & Internet Security, 16.3.2. Security and Nameservice

DNS nameserver attacks : Practical UNIX & Internet Security, 17.3.6.2. DNS nameserver attacks

DNS zone transfers : Practical UNIX & Internet Security, 17.3.6.1. DNS zone transfers

documenting

Building Internet Firewalls, 13.1.5. Snapshot the System
Building Internet Firewalls, 13.1.7. Document the Incident
planning for : Building Internet Firewalls, 13.4.5. Planning for Snapshots

dormant accounts

Practical UNIX & Internet Security, 8.4. Managing Dormant Accounts
Practical UNIX & Internet Security, 8.4.3. Finding Dormant Accounts

evaluating, plan for : Building Internet Firewalls, 13.4.2. Planning for Evaluation of the Incident

false syslog entries : Practical UNIX & Internet Security, 10.5.3.1. Beware false log entries

filename attacks : Practical UNIX & Internet Security, 11.5.1.4. Filename attacks

having tools and supplies for : Building Internet Firewalls, 13.5.5. Keeping a Cache of Tools and Supplies

hidden space : Practical UNIX & Internet Security, 25.2.2.7. Hidden space

hijacking : Building Internet Firewalls, 10.1.1. Hijacking

HOME variable attacks : Practical UNIX & Internet Security, 11.5.1.3. $HOME attacks

identifying and quantifying

Practical UNIX & Internet Security, 2.2.1.2. Identifying threats
Practical UNIX & Internet Security, 2.2.2. Review Your Risks

IFS variable attacks : Practical UNIX & Internet Security, 11.5.1.2. IFS attacks

intruders/attackers

Building Internet Firewalls, 1.2.1.1. Intrusion

Practical UNIX & Internet Security, 1. Introduction

TCP/IP Network Administration, 1.7. Application Layer

TCP/IP Network Administration, 5.2. Linux Kernel Configuration

(see also finger service)

(see also firewalls)

creating hidden files : Practical UNIX & Internet Security, 24.4.1.7. Hidden files and directories

discovering

Practical UNIX & Internet Security, 24.2. Discovering an Intruder
Practical UNIX & Internet Security, 24.2.6. Anatomy of a Break-in

legal options regarding : Practical UNIX & Internet Security, 26.1. Legal Options After a Break-in

pursuing and capturing : Building Internet Firewalls, 13.3. Pursuing and Capturing the

recovering from : Building Internet Firewalls, 13.1.6. Restore and Recover

responding to

Practical UNIX & Internet Security, 24. Discovering a Break-in
Practical UNIX & Internet Security, 24.7. Damage Control

revealing DNS information to : Building Internet Firewalls, 8.10.4.3. Revealing too much information to

reviewing response strategies : Building Internet Firewalls, 13.4.8. Periodic Review of Plans

slower machines and : Building Internet Firewalls, 5.3.2. How Fast a Machine?

tracking from log files : Practical UNIX & Internet Security, 24.3. The Log Files: Discovering an Intruder's

types of : Building Internet Firewalls, 1.2.2. Types of Attackers

letting in accidentally : Practical UNIX & Internet Security, 11.4. Entry

logic bombs

Practical UNIX & Internet Security, 11.1.3. Logic Bombs
Practical UNIX & Internet Security, 27.2.2. Viruses on the Distribution Disk

mailing list for : Practical UNIX & Internet Security, E.1.3.9. RISKS

media failure : Practical UNIX & Internet Security, 7.1.4. Guarding Against Media Failure

meet-in-the-middle attacks : Practical UNIX & Internet Security, 6.4.5.1. Double DES

MUD/IRC client programs : Practical UNIX & Internet Security, 17.3.23. Other TCP Ports: MUDs and Internet Relay Chat (IRC)

multiple failed attacks : Building Internet Firewalls, 12.2.3. The Good, the Bad, and the Ugly

newly created accounts : Practical UNIX & Internet Security, 24.4.1. New Accounts

NIS, unintended disclosure : Practical UNIX & Internet Security, 19.4.5. Unintended Disclosure of Site Information with NIS

notifying people about

Building Internet Firewalls, 13.1.4. Make `Incident in Progress'
Building Internet Firewalls, 13.4.4. Planning for Notification of People
TCP/IP Network Administration, 12.4.2. Looking for Trouble
TCP/IP Network Administration, 12.4.2.2. Checking login activity

with NNTP : Practical UNIX & Internet Security, 17.3.13. Network News Transport Protocol (NNTP) (TCP Port

open (guest) accounts

Practical UNIX & Internet Security, 8.1.4. Open Accounts
Practical UNIX & Internet Security, 8.1.4.6. Potential problems with rsh

password attacks : Building Internet Firewalls, 10.3.1. One-Time Passwords

PATH variable attacks : Practical UNIX & Internet Security, 11.5.1.1. PATH attacks

plaintext attacks : Practical UNIX & Internet Security, 6.2.3. Cryptographic Strength

playback (replay) attacks : Practical UNIX & Internet Security, 19.6.1.2. Using the ticket granting ticket

practicing drills for : Building Internet Firewalls, 13.5.7. Doing Drills

programmed

Practical UNIX & Internet Security, 11. Protecting Against Programmed Threats
Practical UNIX & Internet Security, 11.6.2. Shared Libraries
Practical UNIX & Internet Security, A.1.1.10. Chapter 11: Protecting Against Programmed Threats
Practical UNIX & Internet Security, D.1.4. Computer Viruses and Programmed Threats
authors of : Practical UNIX & Internet Security, 11.3. Authors
damage from : Practical UNIX & Internet Security, 11.2. Damage

recovering from : Building Internet Firewalls, 13.1.6. Restore and Recover

planning to : Building Internet Firewalls, 13.4.6. Planning for Restoration and Recovery

replay attacks : Practical UNIX & Internet Security, 17.3.14. Network Time Protocol (NTP) (UDP Port 123)

responding to

Building Internet Firewalls, 12.2.5. Responding to Attacks
Building Internet Firewalls, 13. Responding to Security Incidents

reviewing response strategies : Building Internet Firewalls, 13.4.8. Periodic Review of Plans

rsh, problems with : Practical UNIX & Internet Security, 8.1.4.6. Potential problems with rsh

sendmail problems : Practical UNIX & Internet Security, 17.3.4.1. sendmail and security

spoofed network connection : Practical UNIX & Internet Security, 8.5.3.1. Trusted path

start-up file attacks

Practical UNIX & Internet Security, 11.5.2. Start-up File Attacks
Practical UNIX & Internet Security, 11.5.2.7. Other initializations

system clock : (see system clock)

theft : (see theft)

/tmp directory attacks : Practical UNIX & Internet Security, 25.2.4. /tmp Problems

toll fraud : Practical UNIX & Internet Security, 14.4.1. One-Way Phone Lines

traffic analysis : Practical UNIX & Internet Security, 18.4. Avoiding the Risks of Eavesdropping

tree-structure attacks : Practical UNIX & Internet Security, 25.2.2.8. Tree-structure attacks

Trojan horses

Practical UNIX & Internet Security, 4.3.5. Using su with Caution
Practical UNIX & Internet Security, 11.1.4. Trojan Horses
Practical UNIX & Internet Security, 11.5. Protecting Yourself
Practical UNIX & Internet Security, 17.3.21.2. X security
Practical UNIX & Internet Security, 19.6.5. Kerberos Limitations
Practical UNIX & Internet Security, 27.2.2. Viruses on the Distribution Disk

trusted hosts : (see trusted hosts)

types of : Building Internet Firewalls, 1.2. What Are You Trying To Protect

unattended terminals

Practical UNIX & Internet Security, 12.3.5. Unattended Terminals
Practical UNIX & Internet Security, 12.3.5.2. X screen savers

unowned files : Practical UNIX & Internet Security, 24.4.1.8. Unowned files

vandalism

Practical UNIX & Internet Security, 12.2.4. Vandalism
Practical UNIX & Internet Security, 12.2.4.3. Network connectors

viruses

Building Internet Firewalls, 1.4.2.4. A firewall can't protect against
Practical UNIX & Internet Security, 11.1. Programmed Threats: Definitions
Practical UNIX & Internet Security, 11.1.5. Viruses
Practical UNIX & Internet Security, 27.2.2. Viruses on the Distribution Disk
bacteria programs : Practical UNIX & Internet Security, 11.1.7. Bacteria and Rabbits
references on : Practical UNIX & Internet Security, D.1.4. Computer Viruses and Programmed Threats

war and terrorism : Practical UNIX & Internet Security, 12.2.5. Defending Against Acts of War and Terrorism

weakness-finding tools : Practical UNIX & Internet Security, 11.1.1. Security Tools

by web browsers

Practical UNIX & Internet Security, 18.5. Risks of Web Browsers
Practical UNIX & Internet Security, 18.5.2. Trusting Your Software Vendor

worms : Practical UNIX & Internet Security, 11.1.6. Worms

audio data content : TCP/IP Network Administration, 3.4.3. Multipurpose Internet Mail Extensions

audio device : Practical UNIX & Internet Security, 23.8. Picking a Random Seed

audit IDs

Practical UNIX & Internet Security, 4.3.3. Other IDs
Practical UNIX & Internet Security, 10.1. The Basic Log Files

auditing

Building Internet Firewalls, 5.8.5. Running a Security Audit

Practical UNIX & Internet Security, 10. Auditing and Logging

(see also logs/logging)

C2 audit : Practical UNIX & Internet Security, 10.1. The Basic Log Files

checklist for : Practical UNIX & Internet Security, A.1.1.9. Chapter 10: Auditing and Logging

checksums

Building Internet Firewalls, 5.8.5.3. About checksums for auditing

Practical UNIX & Internet Security, 6.5.5.1. Checksums

Practical UNIX & Internet Security, 9.2.3. Checksums and Signatures

TCP/IP Network Administration, 1.6.2. Transmission Control Protocol

TCP/IP Network Administration, 11.8. Protocol Case Study

keeping secure : Building Internet Firewalls, 13.5.3. Keeping Secured Checksums

recalculating

TCP/IP Network Administration, 4.2.1. Obtaining an IP Address
TCP/IP Network Administration, 5.3.1.1. Options

using Tripwire for : Building Internet Firewalls, 5.8.5.1. Auditing packages

employee access : Practical UNIX & Internet Security, 13.2.4. Auditing Access

login times : Practical UNIX & Internet Security, 10.1.1. lastlog File

of packages : Building Internet Firewalls, 5.8.5.1. Auditing packages

system activity : Practical UNIX & Internet Security, 2.1. Planning Your Security Needs

tools for : Building Internet Firewalls, B.2. Analysis Tools

user activity : Practical UNIX & Internet Security, 4.1.2. Multiple Accounts with the Same UID

who is logged in

Practical UNIX & Internet Security, 10.1.2. utmp and wtmp Files
Practical UNIX & Internet Security, 10.1.2.1. su commandutmp and wtmp files andsu

AUTH_DES authentication : Practical UNIX & Internet Security, 19.2.2.3. AUTH_DES

AUTH_KERB authentication : Practical UNIX & Internet Security, 19.2.2.4. AUTH_KERB

AUTH_NONE authentication : Practical UNIX & Internet Security, 19.2.2.1. AUTH_NONE

AUTH_UNIX authentication : Practical UNIX & Internet Security, 19.2.2.2. AUTH_UNIX

authd service : Practical UNIX & Internet Security, 23.3. Tips on Writing Network Programs

authdes_win variable : Practical UNIX & Internet Security, 19.3.1.3. Setting the window

authentication

Building Internet Firewalls, 10. Authentication and Inbound

Practical UNIX & Internet Security, 3.2.3. Authentication

TCP/IP Network Administration, 1.7. Application Layer

TCP/IP Network Administration, 4.2.1. Obtaining an IP Address

TCP/IP Network Administration, 7.4.2. RIP Version 2

TCP/IP Network Administration, 9.3.2. NIS+

TCP/IP Network Administration, 12.2. User Authentication

(see also packets)

(see also users)

address-based : Building Internet Firewalls, 2.13. Window Systems

client, network filesystems and : Building Internet Firewalls, 2.12. Network File Systems

commercial systems for : Building Internet Firewalls, 10.4.3. Commercial Solutions

complete systems for : Building Internet Firewalls, 10.4. Complete Authentication

DES-encrypted : TCP/IP Network Administration, 9.3.2. NIS+

false : Building Internet Firewalls, 10.1.3. False Authentication

ID services : Practical UNIX & Internet Security, 16.3.3. Authentication

in pppd

TCP/IP Network Administration, 6.3.4. PPP Daemon Security
TCP/IP Network Administration, A.2. The PPP Daemon

Kerberos

Practical UNIX & Internet Security, 19.6.1. Kerberos Authentication
Practical UNIX & Internet Security, 19.6.1.4. Kerberos 4 vs. Kerberos 5

of logins : Practical UNIX & Internet Security, 17.3.5. TACACS (UDP Port 49)

message digests

Practical UNIX & Internet Security, 6.5.2. Using Message Digests
Practical UNIX & Internet Security, 9.2.3. Checksums and Signatures
Practical UNIX & Internet Security, 23.5.1. Use Message Digests for Storing Passwords

NFS : Building Internet Firewalls, 8.14. Network File System

NIS+ : Practical UNIX & Internet Security, 19.5.4. Using NIS+

of remote logins : Building Internet Firewalls, 2.3. Remote Terminal Access and Command

RPCs

Practical UNIX & Internet Security, 19.2.2. RPC Authentication
Practical UNIX & Internet Security, 19.2.2.4. AUTH_KERB
Secure RPC : Practical UNIX & Internet Security, 19.3.1. Secure RPC Authentication

security standard for : Practical UNIX & Internet Security, 2.4.2. Standards

server : TCP/IP Network Administration, 9.1.5. NFS Authentication Server

TIS FWTK server : Building Internet Firewalls, 10.4.2. TIS FWTK

tools for : Building Internet Firewalls, B.1. Authentication Tools

types of : Building Internet Firewalls, 10.2. What Is Authentication?

for Web use : Practical UNIX & Internet Security, 18.3.3. Setting Up Web Users and Passwords

xhost facility : Practical UNIX & Internet Security, 17.3.21.3. The xhost facility

authenticators : Practical UNIX & Internet Security, 3.1. Usernames

AuthGroupFile option : Practical UNIX & Internet Security, 18.3.2. Commands Within the <Directory>

authoritative servers

TCP/IP Network Administration, 1.7. Application Layer
TCP/IP Network Administration, 3.3. Domain Name Service
TCP/IP Network Administration, 3.3.4. BIND, resolver, and named
(see also nonauthoritative servers)

authors of programmed threats : Practical UNIX & Internet Security, 11.3. Authors

AuthRealm, AuthType, AuthUserFile options : Practical UNIX & Internet Security, 18.3.2. Commands Within the <Directory>

"Auto-Submitted:" header line : sendmail, 35.10. Alphabetized Reference

auto_direct file : TCP/IP Network Administration, 9.1.4. NFS Automounter

auto_home file : TCP/IP Network Administration, 9.1.4. NFS Automounter

auto_master file : TCP/IP Network Administration, 9.1.4. NFS Automounter

Auto_Mounter table (NIS+) : Practical UNIX & Internet Security, 19.5.3. NIS+ Tables

AUTO_NIS_ALIASES macro : sendmail, 18.8. Alphabetized Reference

auto-revarp parameter : TCP/IP Network Administration, 6.1.5.5. Point-to-point

autofs script : TCP/IP Network Administration, 9.1.4. NFS Automounter

autologout shell variable : Practical UNIX & Internet Security, 12.3.5.1. Built-in shell autologout

Automated Systems Incident Response Capability (NASA) : Practical UNIX & Internet Security, F.3.4.24. Automated Systems Incident Response Capability

automatic

Practical UNIX & Internet Security, 11.5.3. Abusing Automatic Mechanisms

(see also at program; cron file)

account lockout : Practical UNIX & Internet Security, 3.3. Entering Your Password

backups system : Practical UNIX & Internet Security, 7.3.2. Building an Automatic Backup System

cleanup scripts (UUCP) : Practical UNIX & Internet Security, 15.6.2. Automatic Execution of Cleanup Scripts

directory listings (Web) : Practical UNIX & Internet Security, 18.2.2.2. Additional configuration issues

disabling of dormant accounts : Practical UNIX & Internet Security, 8.4.3. Finding Dormant Accounts

logging out : Practical UNIX & Internet Security, 12.3.5.1. Built-in shell autologout

mechanisms, abusing

Practical UNIX & Internet Security, 11.5.3. Abusing Automatic Mechanisms
Practical UNIX & Internet Security, 11.5.3.6. Other files

password generation : Practical UNIX & Internet Security, 8.8.4. Password Generators

power cutoff : (see detectors)

sprinkler systems : Practical UNIX & Internet Security, 12.2.1.1. Fire

wtmp file pruning : Practical UNIX & Internet Security, 10.1.3.1. Pruning the wtmp file

Automatic Call Unit (ACU) : TCP/IP Network Administration, 6.3.6. Solaris PPP

automount : TCP/IP Network Administration, 9.1.4. NFS Automounter

automounter daemon (automountd) : TCP/IP Network Administration, 9.1.4. NFS Automounter

autonomous systems (AS)

Building Internet Firewalls, C.10. Internet Routing Architecture

TCP/IP Network Administration, 2.4. Internet Routing Architecture

TCP/IP Network Administration, 7.4. Interior Routing Protocols

defined : TCP/IP Network Administration, 7.5. Exterior Routing Protocols

external (ASE) routes

TCP/IP Network Administration, 7.7.1.3. Exterior gateway configuration
TCP/IP Network Administration, B.8.1. The ospf Statement
TCP/IP Network Administration, B.10.1. The import Statement
types of : TCP/IP Network Administration, B.10.2. The export Statement

listing of : TCP/IP Network Administration, B.10. Control Statements

number (ASN)

TCP/IP Network Administration, 4.3.1. Obtaining an autonomous system number
TCP/IP Network Administration, B.7. Definition Statements
TCP/IP Network Administration, B.8.5. The bgp Statement

subdividing : TCP/IP Network Administration, 7.4.3. Open Shortest Path First

AutoRebuildAliases (D) option

sendmail, 24.5.3. Prevent Simultaneous Rebuilds
sendmail, 34.8. Alphabetized Reference

auxiliary (printer) ports : Practical UNIX & Internet Security, 12.3.1.4. Auxiliary ports on terminals

awk scripts

Practical UNIX & Internet Security, 11.1.4. Trojan Horses
Practical UNIX & Internet Security, 11.5.1.2. IFS attacks

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