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Index: S

aliases in symbol table

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

backup media : Practical UNIX & Internet Security, 7.1.5. How Long Should You Keep a Backup?

bounced messages in qf file

sendmail, 23.3.6. Savemail Panic
(see also archiving information; backups)

sbrk command : Practical UNIX & Internet Security, 23.2. Tips on Avoiding Security-related Bugs

scaling well

TCP/IP Network Administration, 2.4. Internet Routing Architecture
TCP/IP Network Administration, 3.3. Domain Name Service
TCP/IP Network Administration, 4.2.1. Obtaining an IP Address
TCP/IP Network Administration, 7.5.1. Exterior Gateway Protocol

scanf command

sendmail, 32.1.2.1. scanf(3) variations
Practical UNIX & Internet Security, 23.2. Tips on Avoiding Security-related Bugs

SCANF macro : sendmail, 18.8. Alphabetized Reference

scanning networks : Practical UNIX & Internet Security, 17.6. Network Scanning

SCCS (Source Code Control System)

Practical UNIX & Internet Security, 7.3.2. Building an Automatic Backup System
Practical UNIX & Internet Security, 17.3. Primary UNIX Network Services

Scherbius, Arthur : Practical UNIX & Internet Security, 6.3. The Enigma Encryption System

score keepers : Building Internet Firewalls, 1.2.2.3. Score Keepers

scp (secure copy) : TCP/IP Network Administration, 12.2.6. Secure Shell

screen savers : Practical UNIX & Internet Security, 12.3.5.2. X screen savers

screend package

Building Internet Firewalls, 6.5. Conventions for Packet Filtering
Building Internet Firewalls, B.3.1. screend

screened host architecture

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

screened subnet architecture

Building Internet Firewalls, 4.2.3. Screened Subnet Architecture
Building Internet Firewalls, 9.1. Screened Subnet Architecture
with dual-homed host architecture : Building Internet Firewalls, 4.3.8. It's OK to Use

screening routers

Building Internet Firewalls, 4.1.1. Packet Filtering
Building Internet Firewalls, 6. Packet Filtering
(see also packet filtering)
acceptable addresses for : Building Internet Firewalls, 6.5. Conventions for Packet Filtering
choosing : Building Internet Firewalls, 6.8. Choosing a Packet Filtering
configuring : Building Internet Firewalls, 6.2. Configuring a Packet Filtering
proxy systems and : Building Internet Firewalls, 7. Proxy Systems
rules for : Building Internet Firewalls, 6.5. Conventions for Packet Filtering
where to use : Building Internet Firewalls, 6.8.8. It Should Have Good Testing and

screens, multiple : Practical UNIX & Internet Security, 12.3.4.3. Multiple screens

script command : Practical UNIX & Internet Security, 24.1.2. Rule #2: DOCUMENT

script files

TCP/IP Network Administration, 1.7. Application Layer
TCP/IP Network Administration, 6.1.5.1. Enabling and disabling the interface
(see also startup script)
(see also UNIX, systems)
debugging tips : TCP/IP Network Administration, 6.4.4. Troubleshooting Serial Connections
invoking dialup IP (dip) : TCP/IP Network Administration, A.1. Dial-Up IP

scriptfile : TCP/IP Network Administration, A.3. chat

scripting language : TCP/IP Network Administration, 6.3.2. Dial-Up PPP

scripts, CGI : (see CGI, scripts)

scytales : Practical UNIX & Internet Security, 6.1. A Brief History of Cryptography

search entry, in resolv.conf : TCP/IP Network Administration, 8.2.1. The Resolver Configuration File

search programs : Building Internet Firewalls, 2.6. Other Information Services

search warrants

Practical UNIX & Internet Security, 26.2.4. Hazards of Criminal Prosecution
Practical UNIX & Internet Security, 26.2.5. If You or One of Your Employees Is a Target

searching for .rhosts file : Practical UNIX & Internet Security, 17.3.18.5. Searching for .rhosts files

Seberry, Jennifer : Practical UNIX & Internet Security, 6.5.4.3. HAVAL

secondary nameservers

TCP/IP Network Administration, 3.3.4. BIND, resolver, and named
TCP/IP Network Administration, 4.4.1. Obtaining a Domain Name
TCP/IP Network Administration, 8.1.1. BIND Configurations
TCP/IP Network Administration, C.2. named.boot Configuration Commands
configuring : TCP/IP Network Administration, 8.3.1.2. Primary and secondary server configurations

secrecy

defined : TCP/IP Network Administration, 12.1.1. Assessing the Threat
Kerberos : Practical UNIX & Internet Security, 19.6.1.3. Authentication, data integrity, and secrecy
keys for : TCP/IP Network Administration, 6.3.4. PPP Daemon Security

secret keys : Practical UNIX & Internet Security, 6.4.6. RSA and Public Key Cryptography

Secret Service, U.S.

Practical UNIX & Internet Security, 26.2.2. Federal Jurisdiction
Practical UNIX & Internet Security, F.3.3. U.S. Secret Service

secure copy (scp) : TCP/IP Network Administration, 12.2.6. Secure Shell

Secure Hash Algorithm (SHA)

Practical UNIX & Internet Security, 6.5.3. Digital Signatures
Practical UNIX & Internet Security, 6.5.4.2. SHA

Secure HTTP

Building Internet Firewalls, 8.6.4. Secure HTTP
Practical UNIX & Internet Security, 18.4.1. Eavesdropping Over the Wire

Secure NFS : Practical UNIX & Internet Security, 19.3.2.4. Using Secure NFS

-secure option

Practical UNIX & Internet Security, 19.3.2.4. Using Secure NFS
Practical UNIX & Internet Security, 19.4.4.5. Spoofing NIS

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

SECURE points : TCP/IP Network Administration, 12.4.3.1. COPS

Secure RPC

Practical UNIX & Internet Security, 19.3. Secure RPC (AUTH_DES)

Practical UNIX & Internet Security, 19.3.4. Limitations of Secure RPC

with NIS/NIS+

Practical UNIX & Internet Security, 19.3.2. Setting Up Secure RPC with NIS
Practical UNIX & Internet Security, 19.3.4. Limitations of Secure RPC

NTP and : Practical UNIX & Internet Security, 19.3.1.3. Setting the window

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

versus Kerberos : Practical UNIX & Internet Security, 19.6.2. Kerberos vs. Secure RPC

secure shell (ssh) : TCP/IP Network Administration, 12.2.6. Secure Shell

Secure Socket Layer : Practical UNIX & Internet Security, 18.4.1. Eavesdropping Over the Wire

secure terminals : Practical UNIX & Internet Security, 8.5.1. Secure Terminals

SECURE_USERS variable : TCP/IP Network Administration, 12.4.3.1. COPS

SecureID : Practical UNIX & Internet Security, 8.7.2. Token Cards

SecureNet key : Practical UNIX & Internet Security, 8.7.2. Token Cards

security

Building Internet Firewalls, 1.4. What Is an Internet Firewall?

Building Internet Firewalls, 8.1.1.1. SMTP for

Building Internet Firewalls, 8.10.4. DNS Security Problems

Practical UNIX & Internet Security, 2.1. Planning Your Security Needs

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

Practical UNIX & Internet Security, 12.1.1. The Physical Security Plan

sendmail, 18.2. Vendor Versus Compiling

sendmail, 22. Security

TCP/IP Network Administration, 1.7. Application Layer

(see also firewalls)

(see also integrity)

(see also intruders/attackers)

(see also physical security)

(see also printers and printing)

(see also system administration)

against system failure : Building Internet Firewalls, 3.5. Fail-Safe Stance

audit : (see auditing)

bastion host speed and : Building Internet Firewalls, 5.3.2. How Fast a Machine?

bogus qf files

sendmail, 23.3. A Bogus qf File (V8 only): Qf
sendmail, 23.9. The qf File Internals

C line (qf file) : sendmail, 23.9. The qf File Internals

CGI scripts

Practical UNIX & Internet Security, 18.2.3. Writing Secure CGI Scripts and ProgramsThe
Practical UNIX & Internet Security, 18.2.4.1. Beware mixing HTTP with anonymous FTP

changed detection

Practical UNIX & Internet Security, 9.2. Detecting Change
Practical UNIX & Internet Security, 9.3. A Final Note

check_relay rule set : sendmail, 29.10.3. The check_relay Rule Set

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

choke points

Building Internet Firewalls, 6.1. Why Packet Filtering?
Building Internet Firewalls, 9.1.4.3. Choke point
Building Internet Firewalls, 9.2.3.3. Choke point

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

critical messages to log

Practical UNIX & Internet Security, 10.5.3. syslog Messages
Practical UNIX & Internet Security, 10.5.3.1. Beware false log entries

cryptography

(see cryptography)
(see encryption)

default stances : Building Internet Firewalls, 6.2.3. Default Permit Versus Default Deny

default user identities : sendmail, 13.2.5. The Default User Identities

defense in depth

Building Internet Firewalls, 9.1.4.2. Defense in depth
Building Internet Firewalls, 9.2.3.2. Defense in depth

definition of : Practical UNIX & Internet Security, 1.1. What Is Computer Security?

designing for network : Building Internet Firewalls, 1.4.3. Buying Versus Building

digital signatures : (see digital signatures)

disabling finger : Practical UNIX & Internet Security, 17.3.8.2. Disabling finger

disk quotas : Practical UNIX & Internet Security, 25.2.2.5. Using quotas

diversity of defense

Building Internet Firewalls, 3.7. Diversity of Defense
Building Internet Firewalls, 9.1.4.7. Diversity of defense
Building Internet Firewalls, 9.2.3.7. Diversity of defense

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

drills : Practical UNIX & Internet Security, 24.1.3. Rule #3: PLAN AHEAD

encryption, network-level : Building Internet Firewalls, 10.5. Network-Level Encryption

environment variables and

sendmail, 5.3.12. Environment variables
sendmail, 22.2. The Environment

/etc/passwd : (see /etc/group file; /etc/passwd file)

-f switch and

sendmail, 14.6. Trusted User
sendmail, 22.8.1. Trusted Users

fail-safe stance

Building Internet Firewalls, 9.1.4.5. Fail-safe stance
Building Internet Firewalls, 9.2.3.5. Fail-safe stance

file permissions : sendmail, 13.2.4. The Default File Permissions

files and : (see appending to files)

firewalls : (see firewalls)

forged mail

sendmail, 13.2.1. The Location of the Queue Directory
sendmail, 22.7. Forged Mail

four steps toward : Practical UNIX & Internet Security, 2.4.4.7. Defend in depth

host : Building Internet Firewalls, 1.3.3. Host Security

HTTP : Building Internet Firewalls, 8.6.3. HTTP Security

identification protocol : Practical UNIX & Internet Security, 17.3.12. Identification Protocol (auth) (TCP Port

important of simplicity of : Building Internet Firewalls, 3.8. Simplicity

improving DES algorithm

Practical UNIX & Internet Security, 6.4.5. Improving the Security of DES
Practical UNIX & Internet Security, 6.4.5.2. Triple DES

incident response teams : (see incident response teams)

incidents : (see incidents, attacks, threats)

:include: lists : sendmail, 25.2.2. Tradeoffs

insecure networks : Building Internet Firewalls, 4.4.2. Insecure Networks

internal network protection : Building Internet Firewalls, 4.4. Internal Firewalls

IP

Practical UNIX & Internet Security, 16.3. IP Security
Practical UNIX & Internet Security, 16.3.3. Authentication

IP_SRCROUTE macro : sendmail, 18.8. Alphabetized Reference

IRC and : Building Internet Firewalls, 8.9.2. Internet Relay Chat

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

lack of : Building Internet Firewalls, 1.3. How Can You Protect Your Site?

laws and : (see laws)

least privilege

Building Internet Firewalls, 9.1.4.1. Least privilege
Building Internet Firewalls, 9.2.3.1. Least privilege

legal liability

Practical UNIX & Internet Security, 26.4. Other Liability
Practical UNIX & Internet Security, 26.4.7. Harassment, Threatening Communication, and Defamation

legal responsibilities : Building Internet Firewalls, 11.2.3. External Factors That Influence

levels of NIS+ servers : Practical UNIX & Internet Security, 19.5.5. NIS+ Limitations

link-level : Practical UNIX & Internet Security, 16.3.1. Link-level Security

of machine : Building Internet Firewalls, 5.8.1. Securing the Machine

mechanisms included within applications : TCP/IP Network Administration, 12.2.5. Secure the r Commands

message digests : (see message digests)

modem pools : Building Internet Firewalls, 10.6. Terminal Servers and Modem Pools

modems and

Practical UNIX & Internet Security, 14.4. Modems and Security
Practical UNIX & Internet Security, 14.4.4.2. Protection against eavesdropping

monitoring

TCP/IP Network Administration, 12.4. Security Monitoring
(see logs/logging)

multilevel (defense in depth)

Practical UNIX & Internet Security, 1.3. History of UNIX
Practical UNIX & Internet Security, 2.4.4.7. Defend in depth
Practical UNIX & Internet Security, 2.5.3. Final Words: Risk Management Means Common Sense
Practical UNIX & Internet Security, 17.2. Controlling Access to Servers

name service and : Practical UNIX & Internet Security, 16.3.2. Security and Nameservice

national : Practical UNIX & Internet Security, 26.2.2. Federal Jurisdiction

netacl : Building Internet Firewalls, 5.8.3.2. Using netacl to protect services

network

(see network services)
(see networks and networking)

operating system bugs : Building Internet Firewalls, 5.8.1.2. Fix all known system bugs

passwords

Practical UNIX & Internet Security, 3.2. Passwords
Practical UNIX & Internet Security, 3.6.1. Bad Passwords: Open Doors
Practical UNIX & Internet Security, 3.6.4. Passwords on Multiple Machines
Practical UNIX & Internet Security, 3.8. Summary
(see also passwords)

personnel

Practical UNIX & Internet Security, 13. Personnel Security
Practical UNIX & Internet Security, 13.3. Outsiders
Practical UNIX & Internet Security, A.1.1.12. Chapter 13: Personnel Security

planning : TCP/IP Network Administration, 12.1. Security Planning

policy

Building Internet Firewalls, 1.4.1.1. A firewall is a focus for security
Building Internet Firewalls, 11. Security Policies
Practical UNIX & Internet Security, 1.2. What Is an Operating System?
Practical UNIX & Internet Security, 2. Policies and Guidelines
Practical UNIX & Internet Security, 2.5.3. Final Words: Risk Management Means Common Sense
TCP/IP Network Administration, 12.1. Security Planning
reviewing : Building Internet Firewalls, 11.1.1.5. Provision for reviews
writing : TCP/IP Network Administration, 12.1.3. Writing a Security Policy

of POP : Building Internet Firewalls, 8.1.2. Post Office Protocol

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

preventing workstation as gateway : sendmail, 20.2.2. Workstation Refuses to Act as a Mail Gateway

for printers : TCP/IP Network Administration, 4.5.2. Print servers

protecting backups

Building Internet Firewalls, 5.10. Protecting the Machine and Backups
Practical UNIX & Internet Security, 7.1.6. Security for Backups
Practical UNIX & Internet Security, 7.1.6.3. Data security for backups
(see also backups)

protocol, and proxying : Building Internet Firewalls, 7.4.3. Protocol Security

publications, list of : TCP/IP Network Administration, 12.8. Words to the Wise

published resources on

Building Internet Firewalls, A. Resources
Practical UNIX & Internet Security, D. Paper Sources
Practical UNIX & Internet Security, D.2. Security Periodicals

queuing everything : sendmail, 34.8. Alphabetized Reference

rejecting mail from certain sites : sendmail, 20.2.6. Reject Mail from Spamming or Mail-bombing Sites

responding to breakins

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

responding to incidents : Building Internet Firewalls, 13. Responding to Security Incidents

restricting logins : Practical UNIX & Internet Security, 8.3. Restricting Logins

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

.rhosts : (see .rhosts file)

risks

TCP/IP Network Administration, 4.1. Connected and Non-Connected Networks
TCP/IP Network Administration, 4.2.2. Defining the Subnet Mask
TCP/IP Network Administration, 5.3.1.1. Options
TCP/IP Network Administration, 5.3.1.2. Pseudo-device
TCP/IP Network Administration, 5.4. The Internet Daemon
TCP/IP Network Administration, 9.1.2.1. The share command
TCP/IP Network Administration, 13.2.1. Creating an FTP Server

RunAsUser option : sendmail, 34.8. Alphabetized Reference

safe sendmail options : sendmail, 34.1.4. Options that Are Safe

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

sendmail restricted shell : sendmail, 19.6. Alphabetized m4 Macros

sendmail.cf and : sendmail, 22.4. The Configuration File

Skipjack algorithm : Practical UNIX & Internet Security, 6.4.1. Summary of Private Key Systems

SNMP

Building Internet Firewalls, 8.12.1. Simple Network Management
Practical UNIX & Internet Security, 17.3.15. Simple Network Management Protocol (SNMP) (UDP Ports

software piracy : Practical UNIX & Internet Security, 26.4.2.1. Software piracy and the SPA

sources of information : TCP/IP Network Administration, 12.1.2.2. Use mailing lists to distribute information

standards of : Practical UNIX & Internet Security, 2.4.2. Standards

strategies for : Building Internet Firewalls, 3. Security Strategies

SUID_ROOT_FILES_OK macro : sendmail, 18.8. Alphabetized Reference

superuser problems : Practical UNIX & Internet Security, 4.2.1.5. The problem with the superuser

system crashes

Building Internet Firewalls, 5.10.1. Watch Reboots Carefully
Practical UNIX & Internet Security, 10.7.2.1. Exception and activity reports
TCP/IP Network Administration, 9.1.1. NFS Daemons
TCP/IP Network Administration, 9.2.2. Solaris Line Printer Service

TCP Wrapper : Building Internet Firewalls, 5.8.3.1. Using the TCP Wrapper package to protect services

terminal servers : Building Internet Firewalls, 10.6. Terminal Servers and Modem Pools

through obscurity

Building Internet Firewalls, 1.3.2. Security Through Obscurity
Practical UNIX & Internet Security, 2.5. The Problem with Security Through Obscurity
Practical UNIX & Internet Security, 2.5.3. Final Words: Risk Management Means Common Sense
Practical UNIX & Internet Security, 8.8.9. Account Names Revisited: Using Aliases for Increased
Practical UNIX & Internet Security, 18.2.4. Keep Your Scripts Secret!

time information and : Building Internet Firewalls, 8.13. Network Time Protocol (NTP)

tools for : Practical UNIX & Internet Security, 11.1. Programmed Threats: Definitions

Tripwire package

Practical UNIX & Internet Security, 9.2.4. Tripwire
Practical UNIX & Internet Security, 9.2.4.2. Running Tripwire

trusted users : sendmail, 19.6. Alphabetized m4 Macros

universal participation : Building Internet Firewalls, 3.6. Universal Participation

UNIX and

Practical UNIX & Internet Security, 1. Introduction
Practical UNIX & Internet Security, 1.4. Security and UNIX
Practical UNIX & Internet Security, 1.4.3. Add-On Functionality Breeds Problems

user awareness of

Practical UNIX & Internet Security, 1.4.1. Expectations
Practical UNIX & Internet Security, 2. Policies and Guidelines
Practical UNIX & Internet Security, 2.4.4.4. Concentrate on education
Practical UNIX & Internet Security, 13.2.2. Ongoing Training and Awareness

UUCP : (see UUCP)

weakest link

Building Internet Firewalls, 3.4. Weakest Link
Building Internet Firewalls, 9.1.4.4. Weakest link
Building Internet Firewalls, 9.2.3.4. Weakest link

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

when proxying is ineffective : Building Internet Firewalls, 7.8.2. Proxying Won't Secure the Service

whois service : Building Internet Firewalls, 8.8.2. whois

World Wide Web

Practical UNIX & Internet Security, 18. WWW Security
Practical UNIX & Internet Security, 18.7. Summary

X Window System

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

X11 window system mechanisms : Building Internet Firewalls, 8.16. X11 Window System

Security Emergency Response Team (SERT) : Practical UNIX & Internet Security, F.3.4.4. Australia: Internet .au domain

security file (UUCP) : Practical UNIX & Internet Security, 10.3.4. uucp Log Files

security holes

Practical UNIX & Internet Security, 2.5. The Problem with Security Through Obscurity
(see also back doors; threats)
ftpd program : Practical UNIX & Internet Security, 6.5.2. Using Message Digests
mailing list for : Practical UNIX & Internet Security, E.1.3.3. Bugtraq
reporting : Practical UNIX & Internet Security, 2.5.1. Going Public
ruusend in L.cmds file : Practical UNIX & Internet Security, 15.4.3. L.cmds: Providing Remote Command Execution
SUID/SGID programs : Practical UNIX & Internet Security, 5.5.3.1. write: Example of a possible SUID/SGID security
/usr/lib/preserve : Practical UNIX & Internet Security, 5.5.3.2. Another SUID example: IFS and the /usr/lib/preserve
UUCP : Practical UNIX & Internet Security, 15.7. Early Security Problems with UUCP

sed scripts : Practical UNIX & Internet Security, 11.1.4. Trojan Horses

seeds, random number

Practical UNIX & Internet Security, 23.6. Tips on Generating Random Numbers
Practical UNIX & Internet Security, 23.8. Picking a Random Seed

segments

TCP/IP Network Administration, 1.3. TCP/IP Protocol Architecture
TCP/IP Network Administration, 1.6.2. Transmission Control Protocol

select system call : Practical UNIX & Internet Security, 17.1.3. The /etc/inetd Program

selecting delivery agents : (see rule set 0)

selection lists : Practical UNIX & Internet Security, 18.2.3.1. Do not trust the user's browser!

self-destruct sequences : Practical UNIX & Internet Security, 27.2.1. Hardware Bugs

semicolon (;)

comment character : TCP/IP Network Administration, C.3.1. Standard Resource Records

ending gated configuration statements

TCP/IP Network Administration, 7.7.1.1. A host configuration
TCP/IP Network Administration, B.2. The gated Configuration Language

semiprivileged users : sendmail, 22.5. Permissions

sender

sendmail, 29.6.2. Selecting S= and R=

(see also S= equate)

address of

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

check_mail rule set : sendmail, 29.10.1. The check_mail Rule Set

of envelope, logging : sendmail, 26.1.3.3. from= show envelope sender

full name for

sendmail, 36.7. Alphabetized Reference
(see $x macro)

headers for : sendmail, 35.6.2. Sender Headers

running sendmail as : sendmail, 36.7. Alphabetized Reference

unknown : sendmail, 35.10. Alphabetized Reference

"Sender:" header line : sendmail, 35.10. Alphabetized Reference

SENDFILES= command

Practical UNIX & Internet Security, 15.5.1.3. A Sample Permissions file
Practical UNIX & Internet Security, 15.5.2. Permissions Commands

sending messages

sendmail, 13.4. Sending Mail
sendmail, 14.5. Sending Real Mail

sendmail

Building Internet Firewalls, 2.1. Electronic Mail

Building Internet Firewalls, 3.1. Least Privilege

Building Internet Firewalls, 8.1.1.1. SMTP for

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

Practical UNIX & Internet Security, 11.5.2.5. .forward, .procmailrc

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

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

Practical UNIX & Internet Security, 17.3.4.3. Improving the security of Berkeley sendmail V8

Practical UNIX & Internet Security, 24.2.4.2. How to contact the system administrator of a computer

TCP/IP Network Administration, UNIX Versions

TCP/IP Network Administration, 4.5.3. Planning Your Mail System

TCP/IP Network Administration, 10. sendmail

TCP/IP Network Administration, E.2. The sendmail Command

(see also mail)

(see also SMTP)

aliases

Practical UNIX & Internet Security, 11.5.3.3. /usr/lib/aliases, /etc/aliases,
TCP/IP Network Administration, 10.3. sendmail Aliases

classes, listed

TCP/IP Network Administration, E.4.1. sendmail Classes
TCP/IP Network Administration, E.2. The sendmail Command

compiling : TCP/IP Network Administration, E.1. Compiling sendmail

(dis)advantages to : sendmail, 18.1. To Use or Not to Use

exit values : sendmail, 36.5. sendmail's exit() Status

.forward file : Practical UNIX & Internet Security, 24.4.1.6. Changes to startup files

future of : sendmail, The Future

history of

sendmail, History
sendmail, 27.5. The V Configuration Command

installing and configuring

sendmail, 2.1. Get the Source
sendmail, 18.6. Install sendmail
sendmail, 18.8. Alphabetized Reference
TCP/IP Network Administration, 10.5. sendmail Configuration

internal macros, listed : TCP/IP Network Administration, 10.5.2. The Define Macro Command

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

logging to syslog : Practical UNIX & Internet Security, 17.3.4.3. Improving the security of Berkeley sendmail V8

m4 diversions, reserved : sendmail, 19.1.4. m4 diversions

mailer flags, listed : TCP/IP Network Administration, E.4.3. sendmail Mailer Flags

Morris worm : Building Internet Firewalls, 8.1. Electronic Mail

obtaining source code

sendmail, 2.1. Get the Source
sendmail, 18.3. Obtain the Source

options

sendmail, 13.2. Required Options
TCP/IP Network Administration, E.4.2. sendmail Options

pid for : (see $p macro)

readying for DNS : sendmail, 21.1.2. Make sendmail DNS Aware

restricted shell : sendmail, 19.6. Alphabetized m4 Macros

running as a daemon : TCP/IP Network Administration, 10.2. Running sendmail as a Daemon

running manually : sendmail, 1.4. Run sendmail by Hand

same Internet/NIS domain : Practical UNIX & Internet Security, 19.4.3. NIS Domains

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

starting operating mode : sendmail, 31.10. Alphabetized Reference

Sun Microsystem's enhancements to : sendmail, D. Sun Enhancements

testing and debugging arguments : TCP/IP Network Administration, 10.8. Testing sendmail.cf

tools reference : TCP/IP Network Administration, E. A sendmail Reference

using key files in : TCP/IP Network Administration, 10.8.2. Using Key Files in sendmail

using most recent release

TCP/IP Network Administration, 10.8.2. Using Key Files in sendmail
TCP/IP Network Administration, E.1. Compiling sendmail

version of

Practical UNIX & Internet Security, 17.3.4.1. sendmail and security
sendmail, UNIX and sendmail Versions
sendmail, 5.2.1. Version
sendmail, 18.2. Vendor Versus Compiling
sendmail, 27.5. The V Configuration Command
sendmail, 31.10. Alphabetized Reference
sendmail, D.2. Backward Compatibility
TCP/IP Network Administration, Preface
improving Version 8 : Practical UNIX & Internet Security, 17.3.4.3. Improving the security of Berkeley sendmail V8

"savemail panic" message : sendmail, 23.3.6. Savemail Panic

sendmail startup script : TCP/IP Network Administration, 10.2. Running sendmail as a Daemon

sendmail.cf configuration file

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

sendmail, 1.3.1. The Configuration File

sendmail, 3.1. Role in the Filesystem

sendmail, 5. The sendmail.cf File

sendmail, 22.4. The Configuration File

sendmail, 27. The Configuration File

sendmail, 36.4.4. Fourth: Read the Configuration File

TCP/IP Network Administration, 10.4. The sendmail.cf File

TCP/IP Network Administration, 10.4.2. General sendmail.cf Structure

commands

sendmail, 5.1. Overview
TCP/IP Network Administration, 10.5. sendmail Configuration

define class command (C and F) : TCP/IP Network Administration, 10.5.3. The Define Class Command

define macro command (D) : TCP/IP Network Administration, 10.5.2. The Define Macro Command

define mail headers command (H) : TCP/IP Network Administration, 10.5.7. Defining Mail Headers

define mail precedence command (P) : TCP/IP Network Administration, 10.5.6. Defining Mail Precedence

define mailers command (M) : TCP/IP Network Administration, 10.5.8. Defining Mailers

define trusted users command (T) : TCP/IP Network Administration, 10.5.5. Defining Trusted Users

defining macros in : sendmail, 31.3. Configuration File Definitions

freezing : sendmail, 36.7. Alphabetized Reference

installing : sendmail, 15.6. Install the client.cf File

location of : sendmail, 36.7. Alphabetized Reference

modifying

TCP/IP Network Administration, 10.7. Modifying a sendmail.cf File
TCP/IP Network Administration, 10.7.1. Modifying Local Information
TCP/IP Network Administration, 10.7.2. Modifying Options

options and flags

sendmail, 34.1.3. Appropriateness of Options
TCP/IP Network Administration, E.4. More sendmail.cf

pathname for : sendmail, 18.8. Alphabetized Reference

rewrite rules (R, S, and K commands)

TCP/IP Network Administration, 10.6. Rewriting the Mail Address
TCP/IP Network Administration, 10.6.1. Pattern Matching
TCP/IP Network Administration, 10.6.2. Transforming the Address

rule-testing mode and : sendmail, 38.2. Configuration Lines

sample of, locating : TCP/IP Network Administration, 10.4.1. Locating a Sample sendmail.cf File

set option command (O) : TCP/IP Network Administration, 10.5.4. The Set Option Command

structure of : TCP/IP Network Administration, 10.4.2. General sendmail.cf Structure

testing

sendmail, 15.1. Test the Configuration File
TCP/IP Network Administration, 10.8. Testing sendmail.cf
commands, listed : TCP/IP Network Administration, 10.8.1. Testing Rewrite Rules
rewrite rules : TCP/IP Network Administration, 10.8.1. Testing Rewrite Rules

troubleshooting : sendmail, 27.6. Pitfalls

version level command (V) : TCP/IP Network Administration, 10.5.1. The Version Level Command

sendmail.ct file : sendmail, 19.6. Alphabetized m4 Macros

sendmail.cw file : sendmail, 19.6. Alphabetized m4 Macros

sendmail.pid file, pathname for : sendmail, 18.8. Alphabetized Reference

sendmail.st file : sendmail, 26.2.1. The sendmail.st File

sendmail.tar file : TCP/IP Network Administration, 10.4.1. Locating a Sample sendmail.cf File

sendmailvars file : sendmail, D.4. L and G Configuration Commands

"sendmailvars:" header line : sendmail, D.4. L and G Configuration Commands

SendMimeErrors (j) option : sendmail, 34.8. Alphabetized Reference

sensors : (see detectors)

separation of duties : Practical UNIX & Internet Security, 13.2.5. Least Privilege and Separation of Duties

sequence database class : sendmail, 33.8. Alphabetized Reference

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

sequence of commands : Practical UNIX & Internet Security, 23.2. Tips on Avoiding Security-related Bugs

serial

communications packages : TCP/IP Network Administration, 6.4.4. Troubleshooting Serial Connections

devices, adding manually : TCP/IP Network Administration, 6.4.4. Troubleshooting Serial Connections

interfaces

Practical UNIX & Internet Security, 14.2. Serial Interfaces
TCP/IP Network Administration, 6.2. TCP/IP Over a Serial Line

lines

load balancing : TCP/IP Network Administration, 5.2. Linux Kernel Configuration
multiple, using simultaneously : TCP/IP Network Administration, 5.2. Linux Kernel Configuration

protocols

choosing

TCP/IP Network Administration, 6.2.2. Choosing a Serial Protocol
TCP/IP Network Administration, A.1.1. The dip Script File

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

Serial Line Internet Protocol (SLIP) : Practical UNIX & Internet Security, 14.5. Modems and UNIX

Serial Line IP (SLIP)

Practical UNIX & Internet Security, 14.5. Modems and UNIX
Practical UNIX & Internet Security, 16.2. IPv4: The Internet Protocol Version 4
TCP/IP Network Administration, 1.7. Application Layer
TCP/IP Network Administration, 5.2. Linux Kernel Configuration
TCP/IP Network Administration, 5.3.1.2. Pseudo-device
TCP/IP Network Administration, 6.2.1. The Serial Protocols
(see also PLIP (Parallel Line IP))
END character : TCP/IP Network Administration, 6.2.1. The Serial Protocols
ESC character : TCP/IP Network Administration, 6.2.1. The Serial Protocols
installing : TCP/IP Network Administration, 6.4. Installing SLIP
server configuration : TCP/IP Network Administration, 6.4.3. SLIP Server Configuration

serial numbers, logging : Practical UNIX & Internet Security, 10.7.1.2. Informational material

SERT (Security Emergency Response Team) : Practical UNIX & Internet Security, F.3.4.4. Australia: Internet .au domain

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>

servers

Practical UNIX & Internet Security, 16.2.5. Clients and Servers

Practical UNIX & Internet Security, 17.1. Understanding UNIX Internet Servers

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

TCP/IP Network Administration, 1.7. Application Layer

(see also remote, servers)

Archie, running : Building Internet Firewalls, 8.7.3.4. Running an Archie server

backing up : Practical UNIX & Internet Security, 7.2.2. Small Network of Workstations and a Server

caching servers

sendmail, 21.1. Overview
TCP/IP Network Administration, 11.6.2. The data is here and the server can't find it!

checklist for bringing up : Practical UNIX & Internet Security, 17.4. Security Implications of Network Services

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

configuration statement : TCP/IP Network Administration, B.8.10. The routerdiscovery Statement

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

DNS

for internal hosts : Building Internet Firewalls, 8.10.5.2. Set up a real DNS
setting up fake : Building Internet Firewalls, 8.10.5.1. Set up a `fake'

ftp : (see FTP)

http : (see http server)

load shedding : Practical UNIX & Internet Security, 23.3. Tips on Writing Network Programs

local : sendmail, 19.6. Alphabetized m4 Macros

master/slave

TCP/IP Network Administration, 8.1.1. BIND Configurations
(see also NIS)

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

name servers : sendmail, 21.1. Overview

NIS+, security levels of : Practical UNIX & Internet Security, 19.5.5. NIS+ Limitations

offsite : sendmail, 21.5.2. Offsite Servers

overloading with requests : Practical UNIX & Internet Security, 25.3.1. Service Overloading

program, pathname of : TCP/IP Network Administration, 5.4. The Internet Daemon

proxy : (see proxy servers/services)

routed : Building Internet Firewalls, 5.8.2.4. Which services should you disable?

setting up for FTP

Practical UNIX & Internet Security, 17.3.2.4. Setting up an FTP server
Practical UNIX & Internet Security, 17.3.2.6. Setting up anonymous FTP with the standard UNIX FTP

web : (see web servers)

WN : Practical UNIX & Internet Security, 18.3. Controlling Access to Files on Your Server

Xauthority : Practical UNIX & Internet Security, 17.3.21.4. Using Xauthority magic cookies

services : (see network services)

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

services file

Practical UNIX & Internet Security, 17.1.1. The /etc/services File
TCP/IP Network Administration, 5.4. The Internet Daemon
TCP/IP Network Administration, 9.3. Network Information Service
TCP/IP Network Administration, 9.4. A BOOTP Server
TCP/IP Network Administration, 9.7.1. POP Server
TCP/IP Network Administration, 9.7.2. IMAP Server

services host : Building Internet Firewalls, 9.2. Screened Host Architecture

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

ServiceSwitchFile option

sendmail, 21.2.3. Look Up Addresses for Delivery
sendmail, 24.1.1. The aliases(5) file's location
sendmail, 34.8. Alphabetized Reference

SESAME (Secure European System for Applications in a Multivendor Environment) : Practical UNIX & Internet Security, 19.7.2. SESAME

session

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

IDs

Practical UNIX & Internet Security, 4.3.3. Other IDs
Practical UNIX & Internet Security, C.1.3.4. Process groups and sessions

keys

Practical UNIX & Internet Security, 6.4. Common Cryptographic Algorithms
Practical UNIX & Internet Security, 19.3.1.1. Proving your identity

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

set debug command : TCP/IP Network Administration, 8.4. Using nslookup

set domain command : TCP/IP Network Administration, 8.4. Using nslookup

set ruleset (S) command : TCP/IP Network Administration, 10.6.3. The Set Ruleset Command

set type command : TCP/IP Network Administration, 11.6.4. dig: An Alternative to nslookup

seteuid, setreuid routines : sendmail, 22.1.1. Test seteuid and setreuid

setgid capability

Building Internet Firewalls, 5.3.1. What Operating System?
Practical UNIX & Internet Security, 4.3.3. Other IDs
Practical UNIX & Internet Security, 23.4. Tips on Writing SUID/SGID Programs
TCP/IP Network Administration, 12.4.2.1. Checking files
(see also SUID/SGID programs)

setpgrp function : Practical UNIX & Internet Security, C.1.3.4. Process groups and sessions

setrlimit function : Practical UNIX & Internet Security, 23.2. Tips on Avoiding Security-related Bugs

setsid function : Practical UNIX & Internet Security, C.1.3.4. Process groups and sessions

setuid

Building Internet Firewalls, 5.3.1. What Operating System?
Practical UNIX & Internet Security, 23.4. Tips on Writing SUID/SGID Programs
TCP/IP Network Administration, 9.1.3.2. The vfstab and fstab files
(see also SUID/SGID programs)

setuid file : Practical UNIX & Internet Security, 4.3.1. Real and Effective UIDs

SevenBitInput (7) option : sendmail, 34.8. Alphabetized Reference

severity level, warning

sendmail, 26.1.1. syslog(3)
sendmail, 26.1.2. Tuning syslog.conf

SGID bit

Practical UNIX & Internet Security, 5.5.1. SUID, SGID, and Sticky Bits
Practical UNIX & Internet Security, 5.5.7. SGID Bit on Files (System V UNIX Only): Mandatory
(see also SUID/SGID programs)
clearing with chown : Practical UNIX & Internet Security, 5.7. chown: Changing a File's Owner
on directories : Practical UNIX & Internet Security, 5.5.6. SGID and Sticky Bits on Directories
on files : Practical UNIX & Internet Security, 5.5.7. SGID Bit on Files (System V UNIX Only): Mandatory

SGID files : Practical UNIX & Internet Security, B.3.2.2. SGID files

sh (Bourne shell)

Practical UNIX & Internet Security, 5.5.3.2. Another SUID example: IFS and the /usr/lib/preserve

Practical UNIX & Internet Security, 11.5.1. Shell Features

Practical UNIX & Internet Security, C.5.3. Running the User's Shell

SUID and

Practical UNIX & Internet Security, 5.5.2. Problems with SUID
(see also shells)

SHA (Secure Hash Algorithm)

Practical UNIX & Internet Security, 6.5.3. Digital Signatures
Practical UNIX & Internet Security, 6.5.4.2. SHA

shadow file

Practical UNIX & Internet Security, 8.1.1. Accounts Without Passwords
Practical UNIX & Internet Security, 8.8.5. Shadow Password Files
TCP/IP Network Administration, 12.2.1. The Shadow Password File

shadow passwords

Practical UNIX & Internet Security, 3.2.1. The /etc/passwd File
Practical UNIX & Internet Security, 8.4.1. Changing an Account's Password
Practical UNIX & Internet Security, 8.8.5. Shadow Password Files

Shamir, Adi

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

shar format file : Practical UNIX & Internet Security, 11.1.4. Trojan Horses

share command

TCP/IP Network Administration, 9.1.2.1. The share command
TCP/IP Network Administration, 9.1.5. NFS Authentication Server

shareware : Practical UNIX & Internet Security, 27.2.2. Viruses on the Distribution Disk

sharing

directories : TCP/IP Network Administration, 9.1. The Network File System
filesystems : TCP/IP Network Administration, 9.1.2. Sharing Filesystems

sharp sign (#) : Practical UNIX & Internet Security, 6.5.1. Message Digests

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

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

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

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

in m4 files : sendmail, 19.5. Pitfalls

shell escapes

Practical UNIX & Internet Security, 8.1.3. Accounts That Run a Single Command
Practical UNIX & Internet Security, 8.1.4.6. Potential problems with rsh
in L.cmds list : Practical UNIX & Internet Security, 15.4.3. L.cmds: Providing Remote Command Execution

shell scripts

Building Internet Firewalls, 5.8.2.1. How are services managed?
Practical UNIX & Internet Security, 5.5.3. SUID Shell Scripts
Practical UNIX & Internet Security, 5.5.3.2. Another SUID example: IFS and the /usr/lib/preserve
TCP/IP Network Administration, 12.4.2.1. Checking files

shells

Practical UNIX & Internet Security, 1.2. What Is an Operating System?

Practical UNIX & Internet Security, 3.2.1. The /etc/passwd File

Practical UNIX & Internet Security, 11.1.4. Trojan Horses

Practical UNIX & Internet Security, 11.5.1. Shell Features

Practical UNIX & Internet Security, 11.5.1.4. Filename attacks

Practical UNIX & Internet Security, C.2. Creating Processes

Practical UNIX & Internet Security, C.5.3. Running the User's Shell

changing

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

history files : Practical UNIX & Internet Security, 10.4.1. Shell History

one-command accounts : Practical UNIX & Internet Security, 8.1.3. Accounts That Run a Single Command

restricted (rsh, ksh)

Practical UNIX & Internet Security, 8.1.4.1. Restricted shells under System V UNIX
Practical UNIX & Internet Security, 8.1.4.6. Potential problems with rsh

UUCP : (see uucico program)

shells file

Practical UNIX & Internet Security, 8.4.2. Changing the Account's Login
sendmail, 18.8. Alphabetized Reference
sendmail, 22.8.4. The /etc/shells file
sendmail, D.1. Sun Enhancements

Shimomura, Tsutomu : Practical UNIX & Internet Security, 23.3. Tips on Writing Network Programs

shoulder surfing

Practical UNIX & Internet Security, 3.2.4. Passwords Are a Shared Secret
Practical UNIX & Internet Security, 5.5.2. Problems with SUID

show queue mode : sendmail, 4.1.2. Show Queue Mode (-bp)

showmount command

TCP/IP Network Administration, 4.5.1. File servers
TCP/IP Network Administration, 9.1.3. Mounting Remote Filesystems

showq command (SMTP) : sendmail, 22.3.1. SMTP debug

shredders : Practical UNIX & Internet Security, 12.3.3. Other Media

SHTTP : (see Secure HTTP)

shutdowns and wtmp file : Practical UNIX & Internet Security, 10.1.3. last Program

shutting down

Building Internet Firewalls, 13.1.2. Disconnect or Shut Down, as
Building Internet Firewalls, 13.4.3. Planning for Disconnecting or

SIGHUP signal

Practical UNIX & Internet Security, C.4. The kill Command
TCP/IP Network Administration, 9.4. A BOOTP Server
TCP/IP Network Administration, 11.6.3. Cache corruption
TCP/IP Network Administration, A.2. The PPP Daemon
TCP/IP Network Administration, A.2.1. Signal processing
TCP/IP Network Administration, B.1.1. Signal Processing
TCP/IP Network Administration, C.1.1. Signal Processing

SIGINT signal

TCP/IP Network Administration, 11.6.3. Cache corruption
TCP/IP Network Administration, A.2.1. Signal processing
TCP/IP Network Administration, B.1.1. Signal Processing
TCP/IP Network Administration, C.1.1. Signal Processing

SIGKILL signal : Practical UNIX & Internet Security, C.4. The kill Command

Signal Ground (SG) : Practical UNIX & Internet Security, 14.3. The RS-232 Serial Protocol

signals

Practical UNIX & Internet Security, C.3. Signals

sendmail, 26.3. Signaling the Daemon

grounding : Practical UNIX & Internet Security, 25.3.3. Signal Grounding

processing

TCP/IP Network Administration, A.2.1. Signal processing
TCP/IP Network Administration, B.1.1. Signal Processing
TCP/IP Network Administration, C.1.1. Signal Processing

signatures, digital

Practical UNIX & Internet Security, 6.4. Common Cryptographic Algorithms

Practical UNIX & Internet Security, 6.5. Message Digests and Digital Signatures

Practical UNIX & Internet Security, 6.5.5.2. Message authentication codes

Practical UNIX & Internet Security, 9.2. Detecting Change

Practical UNIX & Internet Security, 9.2.3. Checksums and Signatures

TCP/IP Network Administration, 12.6. Encryption

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

detached signatures : Practical UNIX & Internet Security, 6.6.3.6. PGP detached signatures

with PGP : Practical UNIX & Internet Security, 6.6.3.4. Adding a digital signature to an announcement

SIGSTOP signal : Practical UNIX & Internet Security, C.4. The kill Command

SIGTERM signal

Practical UNIX & Internet Security, 25.2.1.1. Too many processes
TCP/IP Network Administration, B.1.1. Signal Processing
TCP/IP Network Administration, D.2. The dhcpd Command

silently discarding datagrams : (see datagrams)

SILO overflows : TCP/IP Network Administration, 6.1.5.4. Maximum transmission unit

Simple Gateway Management Protocol (SGMP) : TCP/IP Network Administration, 11.9. Simple Network Management Protocol

Simple Mail Transfer Protocol : (see SMTP)

Simple Network Management Protocol : (see SNMP)

single-character options : (see options, sendmail)

single-purpose routers : Building Internet Firewalls, 6.8.2. It Can Be a Single-Purpose Router or

single quotation marks (` and ') : sendmail, 19.1.1. m4 is greedy

single threaded mail deliver : TCP/IP Network Administration, E.3.1. define

single-user mode : Practical UNIX & Internet Security, C.5.1. Process #1: /etc/init

SingleLineFromHeader option

sendmail, 18.8. Alphabetized Reference
sendmail, 34.8. Alphabetized Reference

SingleThreadDelivery option

sendmail, 34.1.3. Appropriateness of Options
sendmail, 34.8. Alphabetized Reference

SITE macro (m4) : sendmail, 19.6. Alphabetized m4 Macros

SITECONFIG macro (m4) : sendmail, 19.4.6. UUCP

size

determining free disk space : sendmail, 18.8. Alphabetized Reference

df file : sendmail, 23.4. Printing the Queue

guest messages : sendmail, 20.2.3. Limit the Size of Guest Messages

messages

sendmail, 26.1.3.10. size= the size of the message
sendmail, 30.4. The Equates
sendmail, 34.8. Alphabetized Reference

prescan buffer : sendmail, 18.8. Alphabetized Reference

queue : sendmail, 18.8. Alphabetized Reference

setting maxima : sendmail, 18.8. Alphabetized Reference

syslog buffers : sendmail, 18.8. Alphabetized Reference

SIZE keyword (ESMTP) : sendmail, 34.8. Alphabetized Reference

size= equate (syslog output) : sendmail, 26.1.3.10. size= the size of the message

Skipjack algorithm : Practical UNIX & Internet Security, 6.4.1. Summary of Private Key Systems

Slackware 96 : TCP/IP Network Administration, 4.7. netconfig

slash (/)

/ flag : sendmail, 30.8. Alphabetized F= Flags

character in alias

sendmail, 24.2.2. Delivery to Files
sendmail, 25.7.3. Appending to Files

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

root directory

Practical UNIX & Internet Security, 5.1.1. Directories
(see also root directory)

slattach command : TCP/IP Network Administration, 6.4.1. slattach

slave command : TCP/IP Network Administration, C.2. named.boot Configuration Commands

Slave mode (uucico) : Practical UNIX & Internet Security, 15.1.4. How the UUCP Commands Work

slave server

Practical UNIX & Internet Security, 19.4. Sun's Network Information Service (NIS)
(see also NIS)

SLIP (Serial Line Internet Protocol)

Practical UNIX & Internet Security, 14.5. Modems and UNIX
Practical UNIX & Internet Security, 16.2. IPv4: The Internet Protocol Version 4
TCP/IP Network Administration, 1.7. Application Layer
TCP/IP Network Administration, 5.2. Linux Kernel Configuration
TCP/IP Network Administration, 5.3.1.2. Pseudo-device
TCP/IP Network Administration, 6.2.1. The Serial Protocols
END character : TCP/IP Network Administration, 6.2.1. The Serial Protocols
ESC character : TCP/IP Network Administration, 6.2.1. The Serial Protocols
installing : TCP/IP Network Administration, 6.4. Installing SLIP
server configuration : TCP/IP Network Administration, 6.4.3. SLIP Server Configuration

slocal program : sendmail, 25.7.5.3. The slocal program

slow convergence : TCP/IP Network Administration, 7.4.1.1. Running RIP with routed

Smail3.x : sendmail, 18.1. To Use or Not to Use

Small Business Community Nationwide (SBA CERT) : Practical UNIX & Internet Security, F.3.4.31. Small Business Association

smap package

Building Internet Firewalls, 8.1.1.3. Improving SMTP
Practical UNIX & Internet Security, 17.3.4.1. sendmail and security

smart cards, firewalls : Practical UNIX & Internet Security, 21.5. Special Considerations

smart hosts

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

SMART_HOST macro (m4)

sendmail, 19.6. Alphabetized m4 Macros
sendmail, 31.10. Alphabetized Reference

SMI (Structure of Management Information) : TCP/IP Network Administration, 11.9. Simple Network Management Protocol

smit tool : Practical UNIX & Internet Security, 8.8.2. Constraining Passwords

smoke and smoking : Practical UNIX & Internet Security, 12.2.1.2. Smoke

smrsh program

sendmail, 19.6. Alphabetized m4 Macros
sendmail, 22.8.2. The smrsh Program

SMTP (Simple Mail Transfer Protocol)

Building Internet Firewalls, 2.1. Electronic Mail

Building Internet Firewalls, 5.6. Selecting Services Provided by the

Building Internet Firewalls, 7.5. Proxying Without a Proxy Server

Building Internet Firewalls, 8.1.1. Simple Mail Transfer Protocol

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

Practical UNIX & Internet Security, 17.3.4.3. Improving the security of Berkeley sendmail V8

sendmail, 4.2. Verbose (-v)

sendmail, 18.8. Alphabetized Reference

TCP/IP Network Administration, 1.7. Application Layer

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

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

configuring

firewalls and : Building Internet Firewalls, 8.1.1.6. Configuring SMTP to
in screened host architecture : Building Internet Firewalls, 9.2.1.3. SMTP
in screened subnet architecture : Building Internet Firewalls, 9.1.1.3. SMTP

EHLO command

sendmail, 4.2. Verbose (-v)
sendmail, 34.8. Alphabetized Reference

ESMTP (Extended SMTP)

TCP/IP Network Administration, 3.4.3. Multipurpose Internet Mail Extensions
TCP/IP Network Administration, 10.8. Testing sendmail.cf
private extensions to : TCP/IP Network Administration, 3.4.3. Multipurpose Internet Mail Extensions

ETRN command : sendmail, 23.6.2.4. Process the queue via ESMTP ETRN

EXPN command

sendmail, 22.3.2. SMTP vrfy and expn
sendmail, 22.8.3.5. The PrivacyOptions option

Extended : (see ESMTP)

forging mail with : sendmail, 22.7.2. Forging with SMTP

greeting message : sendmail, 31.10. Alphabetized Reference

HELO command

sendmail, 18.8. Alphabetized Reference
sendmail, 30.8. Alphabetized F= Flags
sendmail, 34.8. Alphabetized Reference

incoming connection rate : sendmail, 34.8. Alphabetized Reference

MAIL command

sendmail, 29.10.1. The check_mail Rule Set
sendmail, 34.8. Alphabetized Reference

multiple connections : sendmail, 34.8. Alphabetized Reference

multiple timeouts : sendmail, 34.8. Alphabetized Reference

RCPT command

sendmail, 23.9. The qf File Internals
sendmail, 29.10.2. The check_rcpt Rule Set
sendmail, 36.7. Alphabetized Reference

refusing on high load : sendmail, 34.8. Alphabetized Reference

running on stdin : sendmail, 36.7. Alphabetized Reference

sendmail and : TCP/IP Network Administration, 10.1. sendmail's Function

service extensions to : TCP/IP Network Administration, 3.4.3. Multipurpose Internet Mail Extensions

SMTP probes : sendmail, 22.3. SMTP Probes

standardizing on : TCP/IP Network Administration, 4.5.3. Planning Your Mail System

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

for UNIX : (see Sendmail)

VRFY command

sendmail, 22.3.2. SMTP vrfy and expn
sendmail, 22.8.3.5. The PrivacyOptions option
sendmail, 30.8. Alphabetized F= Flags

smtpd daemon : sendmail, 36.1.5. smtpd

SMTPDEBUG macro

sendmail, 18.8. Alphabetized Reference
sendmail, 22.3.1. SMTP debug

SmtpGreetingMessage option

sendmail, 31.10. Alphabetized Reference
sendmail, 34.8. Alphabetized Reference

SMTPLINELIM macro : sendmail, 18.8. Alphabetized Reference

SNA (System Network Architecture) : Practical UNIX & Internet Security, 16.4.2. SNA

snapshots, system

Building Internet Firewalls, 13.1.5. Snapshot the System
Building Internet Firewalls, 13.4.5. Planning for Snapshots

SNEFRU algorithm : Practical UNIX & Internet Security, 6.5.4.4. SNEFRU

sniffing

Building Internet Firewalls, 1.2.1.3. Information Theft

Building Internet Firewalls, 10.1.2. Packet Sniffing

Building Internet Firewalls, 10.3.1. One-Time Passwords

Practical UNIX & Internet Security, 1.4.3. Add-On Functionality Breeds Problems

Practical UNIX & Internet Security, 3. Users and Passwords

Practical UNIX & Internet Security, 8.7. One-Time Passwords

Practical UNIX & Internet Security, 17.3.3. TELNET (TCP Port 23)

(see also eavesdropping)

network : Practical UNIX & Internet Security, 16.3. IP Security

packet

Building Internet Firewalls, 10.1.2. Packet Sniffing
Practical UNIX & Internet Security, 16.3.1. Link-level Security
Practical UNIX & Internet Security, 17.3.3. TELNET (TCP Port 23)

SNK-004 card, TIS FWTK : Building Internet Firewalls, 10.3.3. Challenge-Response Schemes

SNMP (Simple Network Management Protocol)

Building Internet Firewalls, 2.10. Network Management Services
Practical UNIX & Internet Security, 17.3.15. Simple Network Management Protocol (SNMP) (UDP Ports
TCP/IP Network Administration, 11.9. Simple Network Management Protocol
configuring : Building Internet Firewalls, 8.12.1. Simple Network Management
statement (in gated) : TCP/IP Network Administration, B.8.7. The snmp Statement

snoop

Practical UNIX & Internet Security, 24.2.3. Monitoring the Intruder
TCP/IP Network Administration, 11.2. Diagnostic Tools
TCP/IP Network Administration, 11.7. Analyzing Protocol Problems
detailed analysis with : TCP/IP Network Administration, 11.3. Testing Basic Connectivity

snuffle program : Building Internet Firewalls, 5.8.2.2. How to disable services

SOA records

sendmail, 15.3. MX Records
TCP/IP Network Administration, 8.3.2. Standard Resource Records
TCP/IP Network Administration, 8.3.4. The named.local File
TCP/IP Networ