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Index: H

modems

Practical UNIX & Internet Security, 14. Telephone Security
Practical UNIX & Internet Security, 14.6. Additional Security for Modems

physical security of

Practical UNIX & Internet Security, 12.2. Protecting Computer Hardware
Practical UNIX & Internet Security, 12.2.7. Related Concerns

read-only filesystems : Practical UNIX & Internet Security, 9.1.2. Read-only Filesystems

router : (see routers and routing)

seized as evidence : Practical UNIX & Internet Security, 26.2.4. Hazards of Criminal Prosecution

HAS... macros : sendmail, 18.8. Alphabetized Reference

hash database class : sendmail, 33.8. Alphabetized Reference

hash functions : Practical UNIX & Internet Security, 6.5.1. Message Digests

disabling services with : Practical UNIX & Internet Security, 17.3. Primary UNIX Network Services

for comments

sendmail, 5.1. Overview
sendmail, 5.2.2. Comments
sendmail, 27.2. Comments
sendmail, 38.2. Configuration Lines
TCP/IP Network Administration, 3.2. The Host Table
TCP/IP Network Administration, 5.4. The Internet Daemon
TCP/IP Network Administration, 7.7.1.1. A host configuration
TCP/IP Network Administration, 9.1.4. NFS Automounter
TCP/IP Network Administration, 9.2.1. The printcap File
TCP/IP Network Administration, 9.4. A BOOTP Server
TCP/IP Network Administration, A.1.1. The dip Script File
TCP/IP Network Administration, D.3. The dhcpd.conf Configuration File

lines in sendmail.cf : sendmail, 3.1. Role in the Filesystem

in :include: lists : sendmail, 25.2.1. Comments in :include: Lists

in m4 files : sendmail, 19.5. Pitfalls

hash mark (#) for comments : (see # (hash mark))

HAVAL algorithm

Practical UNIX & Internet Security, 6.5.4.3. HAVAL
Practical UNIX & Internet Security, 23.9. A Good Random Seed

Hayes modems : TCP/IP Network Administration, 6.3.2. Dial-Up PPP

compatibility problems : TCP/IP Network Administration, 6.4.4. Troubleshooting Serial Connections

HDB UUCP : Practical UNIX & Internet Security, 15.2. Versions of UUCP

header packet

Building Internet Firewalls, 6.3. What Does a Packet Look Like?
Practical UNIX & Internet Security, 16.2. IPv4: The Internet Protocol Version 4

header section, DNS packet

DNS & BIND, 11.6.1. Seeing the Query and Response Packets
DNS & BIND, 14.2.1. DNS Packet Format
DNS & BIND, A.3. Header Section Format
Perl objects for : DNS & BIND, 14.3.3. Header Objects

headers

TCP/IP Network Administration, 1.3. TCP/IP Protocol Architecture

TCP/IP Network Administration, 1.5.1.1. The datagram

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

.h files : TCP/IP Network Administration, 5.3.1.2. Pseudo-device

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

email message

sendmail, 1.5. The Header

sendmail, 5.3.8. Headers

sendmail, 13.4. Sending Mail

sendmail, 14.1. Headers

(see also under specific header line)

adding : sendmail, 20.3. Alphabetized V8.8 Subroutines

changing values of : sendmail, 20.3. Alphabetized V8.8 Subroutines

conf.c file : sendmail, 35.5. Header Behavior in conf.c

defining : (see H configuration command)

delivery agent flags and

sendmail, 14.2. Headers Versus Delivery Agent Flags
sendmail, 35.4. ?flags? in Header Definitions

field contents : sendmail, 35.3. Header Field Contents

firewalls and : sendmail, 20.2.5. Prune Received: Headers at Firewall

getting recipients from : sendmail, 36.7. Alphabetized Reference

mailing lists and : sendmail, 25.5.1. Reply Versus Bounce

in qf file : sendmail, 23.9. The qf File Internals

in queue : sendmail, 3.1.2. The Queue Directory

removing (deleting) : sendmail, 20.3. Alphabetized V8.8 Subroutines

using old style of : sendmail, 34.8. Alphabetized Reference

nested IP : Building Internet Firewalls, 6.3.6. IP Version 6

packet filtering and : Building Internet Firewalls, 6.8.4. It Should Allow Rules Based on Any

heat, extreme : Practical UNIX & Internet Security, 12.2.1.6. Temperature extremes

Hellman, Martin : Practical UNIX & Internet Security, 6.4.5.1. Double DES

Hellman-Merkle : Practical UNIX & Internet Security, 18.6. Dependence on Third Parties

hello

messages : TCP/IP Network Administration, 7.5.1. Exterior Gateway Protocol
packets : TCP/IP Network Administration, 7.4.3. Open Shortest Path First
statement (in gated) : TCP/IP Network Administration, B.8.3. The hello Statement

HELO command

sendmail, 18.8. Alphabetized Reference
sendmail, 30.8. Alphabetized F= Flags
sendmail, 34.8. Alphabetized Reference
TCP/IP Network Administration, 3.4.2. Post Office Protocol
TCP/IP Network Administration, 3.4.3. Multipurpose Internet Mail Extensions
TCP/IP Network Administration, 7.4. Interior Routing Protocols

HELP command

in ESMTP : TCP/IP Network Administration, 3.4.3. Multipurpose Internet Mail Extensions

in nslookup : TCP/IP Network Administration, 8.4. Using nslookup

in SMTP

sendmail, 34.8. Alphabetized Reference
TCP/IP Network Administration, 3.4.1. Simple Mail Transfer Protocol

help on sendmail

sendmail, Additional Sources of Information
sendmail, 2.2. Read the Documents

HelpFile (H) option : sendmail, 34.8. Alphabetized Reference

herror routine : DNS & BIND, 14.2.4. The Resolver Library Routines

HES_GETMAILHOST macro : sendmail, 18.8. Alphabetized Reference

Hesiod class

DNS & BIND, 2.1.3. Resource Records
sendmail, 33.8. Alphabetized Reference

HESIOD macro : sendmail, 18.8. Alphabetized Reference

Hewlett-Packard (HP) : Practical UNIX & Internet Security, F.3.4.17. Hewlett-Packard (HP)

HFDIR= directive : sendmail, 18.4.9. HFDIR=

hidden

data, in CGI scripts : Practical UNIX & Internet Security, 18.2.3.1. Do not trust the user's browser!
files, created by intruders : Practical UNIX & Internet Security, 24.4.1.7. Hidden files and directories
space : Practical UNIX & Internet Security, 25.2.2.7. Hidden space

hidden dot algorithm : sendmail, 4.2. Verbose (-v)

hiding information with DNS : Building Internet Firewalls, 8.10.5. Setting Up DNS to Hide

hierarchy, system : TCP/IP Network Administration, 3.3.1. The Domain Hierarchy

database system : TCP/IP Network Administration, 9.3.2. NIS+
of responsibility : TCP/IP Network Administration, 12.1.2.1. Use subnets to distribute control

high bit : sendmail, 30.8. Alphabetized F= Flags

High-level Data Link Control (HDLC) : TCP/IP Network Administration, 6.2.1. The Serial Protocols

high-speed dial-up modems : (see modems)

hijacking : Building Internet Firewalls, 10.1.1. Hijacking

hijacking Telnet sessions : Practical UNIX & Internet Security, 17.3.3. TELNET (TCP Port 23)

HINFO records

DNS & BIND, 15.7.1. Host Information
DNS & BIND, A.1.2.3. HINFO host information
Building Internet Firewalls, 8.10.4.3. Revealing too much information to
TCP/IP Network Administration, 11.6.2. The data is here and the server can't find it!
TCP/IP Network Administration, C.3.1.7. Host Information record
queries statistic : DNS & BIND, 7.6.2. Understanding the BIND Statistics

hints : (see caching)

hints file : TCP/IP Network Administration, 8.3.3. The Cache Initialization File

history file (csh)

Practical UNIX & Internet Security, 10.4.1. Shell History
Practical UNIX & Internet Security, 15.1.1.1. uucp with the C shell

history, sendmail

sendmail, History
sendmail, 27.5. The V Configuration Command

hit lists of passwords : Practical UNIX & Internet Security, 3.6.1. Bad Passwords: Open Doors

hoaxes about viruses : TCP/IP Network Administration, 12.1.2.2. Use mailing lists to distribute information

HoldExpensive (c) option

sendmail, 23.6.1. Periodically with -q
sendmail, 34.8. Alphabetized Reference
sendmail, 36.7. Alphabetized Reference

holding messages : (see queue)

holes, security : (see security holes)

home directory, recipient's : sendmail, 31.10. Alphabetized Reference

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

homogeneity : DNS & BIND, 8.1.1. Where Do I Put My Name Servers?

HoneyDanBer (HDB) UUCP : Practical UNIX & Internet Security, 15.2. Versions of UUCP

Honeyman, Peter : Practical UNIX & Internet Security, 15.2. Versions of UUCP

hop count

sendmail, 14.1.2. The Received: Header
sendmail, 31.10. Alphabetized Reference
sendmail, 34.8. Alphabetized Reference
sendmail, 36.7. Alphabetized Reference
TCP/IP Network Administration, 7.4.1.1. Running RIP with routed

hops

TCP/IP Network Administration, 1.7. Application Layer
TCP/IP Network Administration, 2.5. The Routing Table
(see also next hop)

host database class : sendmail, 33.8. Alphabetized Reference

Host Information records : (see HINFO records)

host status : sendmail, B.1. Status file lines

host unreachable

DNS & BIND, 6.1.4.1. One name server configured
(see also ICMP)

Host-to-Host Transport Layer : (see Transport Layer)

host.aliases file : DNS & BIND, 6.3.4. Providing Aliases

HOST_NOT_FOUND error : DNS & BIND, 14.2.4. The Resolver Library Routines

hostname command

DNS & BIND, 4.7.3.1. Initialize the default domain name
sendmail, 7.3.1. The hostname

hostnames

Practical UNIX & Internet Security, 16.2.3. Hostnames

Practical UNIX & Internet Security, 16.2.3.1. The /etc/hosts file

sendmail, 7.3.1. The hostname

sendmail, 21.2.2. Look Up a Remote Host's Name

TCP/IP Network Administration, 3.1. Names and Addresses

$@ operator and

sendmail, 9.2.2. The Host ($@)
sendmail, 9.3. Testing Rule Set 0
sendmail, 17.1.1.3. Handle null address
sendmail, 33.4.2. Specify Numbered Substitution with $@

canonicalizing : (see canonicalization)

capitalization of : sendmail, 30.8. Alphabetized F= Flags

changing to hub name : sendmail, 11.6. Handling user@thishost

choosing : TCP/IP Network Administration, 4.4.2. Choosing a Hostname

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

default : sendmail, 33.5.3. A :default Outgoing Hostname

domain part : (see $m macro)

easing transition from old to new : TCP/IP Network Administration, C.3.1.5. Canonical Name record

name service and

Practical UNIX & Internet Security, 16.2.6. Name Service
Practical UNIX & Internet Security, 16.2.6.2. Other naming services

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

short form of : (see $w macro)

hostresorder directive : DNS & BIND, 6.4.6. Silicon Graphics' IRIX

HOSTRESORDER variable

DNS & BIND, 6.4.6. Silicon Graphics' IRIX
DNS & BIND, 6.4.7. SCO's Open Server 5.0

hosts

DNS & BIND, 2.1.2. Domains

sendmail, 6.3. The local Delivery Agent

TCP/IP Network Administration, 1.7. Application Layer

(see also $h macro)

(see also remote, hosts, checking)

$_ macro

sendmail, 20.2.4. Verify identd Information
sendmail, 23.9. The qf File Internals
sendmail, 26.1.3.9. relay= the host that sent or accepted the message
sendmail, 31.10. Alphabetized Reference

adding and deleting

DNS & BIND, 7.2.1. Adding and Deleting Hosts
DNS & BIND, 13.3.4. 4. Added Name to Database File, but Forgot to Add PTR Record

addresses : (see addresses)

architecture of

dual-homed : Building Internet Firewalls, 4.2.1. Dual-Homed Host Architecture

screened

Building Internet Firewalls, 4.2.2. Screened Host Architecture
Building Internet Firewalls, 9.2. Screened Host Architecture

bastion : (see bastion hosts)

canonical names of : sendmail, 31.10. Alphabetized Reference

checking if local : sendmail, 17.2.1. Is the Host Local?

configuring to use DNS : DNS & BIND, 6. Configuring Hosts

consequences of : DNS & BIND, 6.3. Minimizing Pain and Suffering
vendor-specific UNIX systems : DNS & BIND, 6.4. Vendor-Specific Options

CPU load on : DNS & BIND, 8.1.2. Capacity Planning

determining aliases of : DNS & BIND, 15.1.6. Finding Out a Host's Aliases

disambiguating : DNS & BIND, 6.3.3. Updating .rhosts, hosts.equiv, etc.

file, caution regarding : TCP/IP Network Administration, 6.1.3. Assigning a Subnet Mask

generating db files : (see h2n utility)

information records : (see HINFO records)

IP addresses of : sendmail, 31.10. Alphabetized Reference

list : TCP/IP Network Administration, 12.5.1.1. tcpd access control files

mail exchangers

DNS & BIND, 5.1. MX Records
DNS & BIND, 5.2. What's a Mail Exchanger, Again?

masquerading : (see masquerading)

multihomed

DNS & BIND, 4.2.4. NS Records
DNS & BIND, 4.2.5. Address and Alias Records
DNS & BIND, 10.5. Name Server Address Sorting
TCP/IP Network Administration, 1.5.1.2. Routing datagrams

name checking

DNS & BIND, 4.5. Host Name Checking (BIND 4.9.4 and Later Versions)
Building Internet Firewalls, 2.9. Name Service

network interface interval : DNS & BIND, 10.4.3.2. Interface interval

NID passwords for : Practical UNIX & Internet Security, 19.3.2.2. Creating passwords for hosts

offsite MX : sendmail, 21.5.1. Offsite MX Hosts

preference

sendmail, 15.3. MX Records
sendmail, 21.3. Set Up MX Records

security of : Building Internet Firewalls, 1.3.3. Host Security

sender's : (see $s macro)

sending, variables for : sendmail, 20.1.2. Global Variables

setting : sendmail, 36.7. Alphabetized Reference

smart

sendmail, 19.6. Alphabetized m4 Macros
sendmail, 29.6.4. Forwarding to a Knowledgeable Host
sendmail, 31.10. Alphabetized Reference

speed of : Building Internet Firewalls, 5.3.2. How Fast a Machine?

statistics for : DNS & BIND, 7.6.2. Understanding the BIND Statistics

sticky and nonsticky : sendmail, 19.6. Alphabetized m4 Macros

table

TCP/IP Network Administration, 3.1. Names and Addresses
TCP/IP Network Administration, 3.2. The Host Table
system, problems with : TCP/IP Network Administration, 3.2. The Host Table

trusted : (see trusted hosts)

victim : (see victim hosts)

hosts file

Practical UNIX & Internet Security, 16.2.3.1. The /etc/hosts file
sendmail, 7.3.1. The hostname
sendmail, 18.8. Alphabetized Reference
sendmail, 34.8. Alphabetized Reference
TCP/IP Network Administration, 3.2. The Host Table
TCP/IP Network Administration, 6.1. The ifconfig Command
TCP/IP Network Administration, 7.3. Building a Static Routing Table
TCP/IP Network Administration, 9.1.4. NFS Automounter
TCP/IP Network Administration, 9.3. Network Information Service
creating : TCP/IP Network Administration, 3.2. The Host Table
empty : DNS & BIND, 6.4.1.3. Ignoring NIS
as maps : TCP/IP Network Administration, 3.3.5. Network Information Service
modifying : TCP/IP Network Administration, 3.3.4. BIND, resolver, and named
power outages and : DNS & BIND, 8.6.2. Longer Outages (Days)

hosts.allow file : TCP/IP Network Administration, 12.5.1.1. tcpd access control files

hosts.deny file

Building Internet Firewalls, 5.8.3.1. Using the TCP Wrapper package to protect services
TCP/IP Network Administration, 12.5.1.1. tcpd access control files

hosts.equiv file

DNS & BIND, 6.3.3. Updating .rhosts, hosts.equiv, etc.
Practical UNIX & Internet Security, 17.3.18.4. The ~/.rhosts file
Practical UNIX & Internet Security, 17.3.18.6. /etc/hosts.lpd file
Practical UNIX & Internet Security, 24.4.1.5. Changes to the hosts.equiv file
TCP/IP Network Administration, 12.2.5. Secure the r Commands
TCP/IP Network Administration, 12.4.2. Looking for Trouble

hosts.lpd file

Practical UNIX & Internet Security, 17.3.18.6. /etc/hosts.lpd file
TCP/IP Network Administration, 9.2.1.1. LPD security
TCP/IP Network Administration, 12.4.2. Looking for Trouble

HOSTS.TXT file

DNS & BIND, 1.2.1. The History of the Domain Name System
DNS & BIND, 15.6. Network Names and Numbers

HostsFile option : sendmail, 34.8. Alphabetized Reference

hoststat command : sendmail, 36.1.1. hoststat (V8.8 and Above)

HostStatusDirectory option

sendmail, 34.8. Alphabetized Reference
sendmail, B. Host Status File Internals

housekeeping : Building Internet Firewalls, 12.1. Housekeeping

HP (Hewlett-Packard) : Practical UNIX & Internet Security, F.3.4.17. Hewlett-Packard (HP)

HP-UX : DNS & BIND, 6.4.3. HP's HP-UX

access control lists : Practical UNIX & Internet Security, 5.2.5.2. HP-UX access control lists
context-dependent files : Practical UNIX & Internet Security, 5.9.2. Context-Dependent Files

HS (Hesiod) class : DNS & BIND, 2.1.3. Resource Records

htable command : TCP/IP Network Administration, 3.2. The Host Table

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

HTML (Hypertext Markup Language) : Building Internet Firewalls, 2.5. The World Wide Web

HTML documents

controlling access to

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

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

encrypting : Practical UNIX & Internet Security, 18.4.1. Eavesdropping Over the Wire

server-side includes

Practical UNIX & Internet Security, 18.2.2.2. Additional configuration issues
Practical UNIX & Internet Security, 18.3.2. Commands Within the <Directory>

html text subtype : TCP/IP Network Administration, 3.4.3. Multipurpose Internet Mail Extensions

htpasswd program : Practical UNIX & Internet Security, 18.3.3. Setting Up Web Users and Passwords

HTTP (Hypertext Transfer Protocol)

Building Internet Firewalls, 2.5. The World Wide Web

Practical UNIX & Internet Security, 17.3.9. HyperText Transfer Protocol (HTTP) (TCP Port 80)

TCP/IP Network Administration, 1.7. Application Layer

TCP/IP Network Administration, 13.1. The World Wide Web

anonymous FTP and : Practical UNIX & Internet Security, 18.2.4.1. Beware mixing HTTP with anonymous FTP

CERN server : Building Internet Firewalls, 8.6.2. Proxying Characteristics of

configuring : Building Internet Firewalls, 8.6. World Wide Web (WWW) and HTTP

in screened host architecture : Building Internet Firewalls, 9.2.1.5. HTTP
in screened subnet architecture : Building Internet Firewalls, 9.1.1.5. HTTP

logging downloaded files : Practical UNIX & Internet Security, 10.3.5. access_log Log File

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

proxying with TIS FWTK : Building Internet Firewalls, 7.7.4. Other TIS FWTK

Secure

Building Internet Firewalls, 8.6.4. Secure HTTP
(see Secure HTTP)

TIS FWTK proxy server : Building Internet Firewalls, 8.6.2. Proxying Characteristics of

http server

group file : Practical UNIX & Internet Security, 18.3.2. Commands Within the <Directory>
log files of : Practical UNIX & Internet Security, 18.4.2. Eavesdropping Through Log Files
password file : Practical UNIX & Internet Security, 18.3.2. Commands Within the <Directory>

http-gw proxy

Building Internet Firewalls, 7.7.4. Other TIS FWTK
Building Internet Firewalls, 8.6.2. Proxying Characteristics of

httpd.conf file : Practical UNIX & Internet Security, 18.2.1. The Server's UID

hubs

sendmail, 6. The Mail Hub and Delivery Agents
sendmail, 11.3. All Mail from the Hub
accepting mail : sendmail, 15.4. Hub Accepts Mail for Client
changing hostname to : sendmail, 11.6. Handling user@thishost
delivery agent flags for : sendmail, 6.4. Add the Missing Parts to Mhub
$H macro : sendmail, 31.10. Alphabetized Reference
internal name for : sendmail, 11.4.2. A Word About ${HUB}
rules for : sendmail, 17. The Hub's Complex Rules

Hubset rule set

sendmail, 11.2. Rule Set S=
sendmail, 11.4. Rule Set Hubset

human error

Practical UNIX & Internet Security, 7.1.4. Guarding Against Media Failure
TCP/IP Network Administration, 11.1.1. Troubleshooting Hints

humidity : Practical UNIX & Internet Security, 12.2.1.11. Humidity

hunches, verifying : TCP/IP Network Administration, 10.8.1. Testing Rewrite Rules

HUP signal

DNS & BIND, 7.1. BIND Name Server Signals
DNS & BIND, 7.6.2. Understanding the BIND Statistics

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

hypertext links, encrypting : Practical UNIX & Internet Security, 18.4.1. Eavesdropping Over the Wire

Hypertext Markup Language : (see HTML)

Hypertext Transfer Protocol : (see HTTP)

hyphen (-)

in machine conversation : sendmail, 4.2. Verbose (-v)
non-equivalent host : TCP/IP Network Administration, 12.2.5. Secure the r Commands

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

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