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Index: U

packet relayer

Building Internet Firewalls, 7.6. Using SOCKS for
Building Internet Firewalls, B.4.3. UDP Packet Relayer
Practical UNIX & Internet Security, E.4.15. UDP Packet Relayer

UDP response packets

DNS & BIND, 7.6.1. Common Syslog Messages
DNS & BIND, 8.3. Registering Name Servers
DNS & BIND, 11.3. Option Settings
checksums disabled : DNS & BIND, 13.5.5. Name Server Startup Fails Because UDP Checksums Disabled
overflowing : DNS & BIND, 11.7.7. Unspecified Error

ufsdump : (see dump/restore program)

UIDs (user identifiers)

Practical UNIX & Internet Security, 4.1. Users and Groups

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

TCP/IP Network Administration, 5.4. The Internet Daemon

assume specified : sendmail, 30.8. Alphabetized F= Flags

real versus effective

Practical UNIX & Internet Security, 4.3.1. Real and Effective UIDs
Practical UNIX & Internet Security, C.1.3.2. Process real and effective UID

RPC requests and : Practical UNIX & Internet Security, 19.2.2.2. AUTH_UNIX

running agent as : sendmail, 30.4. The Equates

su command and : Practical UNIX & Internet Security, 10.1.2.1. su commandutmp and wtmp files andsu

of web servers : Practical UNIX & Internet Security, 18.2.1. The Server's UID

zero : (see root account/user; superusers)

UK Defense Research Agency : Practical UNIX & Internet Security, F.3.4.37. UK Defense Research Agency

ulimit command : Practical UNIX & Internet Security, 25.2.5. Soft Process Limits: Preventing Accidental Denial

Ultrix : Practical UNIX & Internet Security, 1.3. History of UNIX

trusted path : Practical UNIX & Internet Security, 8.5.3.1. Trusted path
UUCP : Practical UNIX & Internet Security, 15.4.1.3. Format of USERFILE entry without system name

umask

Practical UNIX & Internet Security, 5.3. The umask
Practical UNIX & Internet Security, 5.3.2. Common umask Values
Practical UNIX & Internet Security, 8.4.3. Finding Dormant Accounts

umount command : TCP/IP Network Administration, 9.1.3.1. The mount command

uname system call : sendmail, 18.8. Alphabetized Reference

unattended terminals

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

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

unauthorized zone transfers : DNS & BIND, 10.11.3. Preventing Unauthorized Zone Transfers

unavailable resource error : sendmail, 36.5.9. EX_UNAVAILABLE A Resource

"Unbalanced" warning : sendmail, 28.1.2. Rules Are Treated Like Addresses

uncompressing BIND source code : DNS & BIND, B.2. Unpack the Source Code

uncompressing domain names : DNS & BIND, 14.2.6. The Name Server Library Routines

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

undivert command (m4) : sendmail, 19.1.4. m4 diversions

unexpected, dealing with the : TCP/IP Network Administration, 11. Troubleshooting TCP/IP

unicasting

Building Internet Firewalls, 8.9.3. The Multicast Backbone (MBONE)
TCP/IP Network Administration, 2.2.2.1. Final notes on IP addresses
(see also addresses)

unidirectional connections : Building Internet Firewalls, 7.4.2. Unidirectional Versus Multidirectional

uniformity : sendmail, 18.2. Vendor Versus Compiling

uninterruptable power supply (UPS)

Practical UNIX & Internet Security, 2.2. Risk Assessment
Practical UNIX & Internet Security, 12.2.1.1. Fire

uninterruptable power system (UPS) : DNS & BIND, 8.5.2. Recommendations

Unisys : Practical UNIX & Internet Security, F.3.4.39. Unisys

United States Department of Energy : Practical UNIX & Internet Security, F.3.4.12. France

United States Department of the Navy : Practical UNIX & Internet Security, F.3.4.44. U.S. Department of the Navy

United States law : (see laws)

United States Naval Research Laboratory (NRL) : TCP/IP Network Administration, 12.2.4. OPIE

United States Secret Service

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

universal participation : Building Internet Firewalls, 3.6. Universal Participation

universal resource locators (URLs) : TCP/IP Network Administration, 13.1. The World Wide Web

universes : Practical UNIX & Internet Security, 5.9.1. Dual Universes

UNIX

Building Internet Firewalls, 5.3.1. What Operating System?

Practical UNIX & Internet Security, 1. Introduction

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

checksum programs

Building Internet Firewalls, 5.8.5.3. About checksums for auditing
(see also checksums)

computers : TCP/IP Network Administration, Audience

conventional passwords : Practical UNIX & Internet Security, 3.2.6. Conventional UNIX Passwords

DAC (Discretionary Access Controls) : Practical UNIX & Internet Security, 4.1.3. Groups and Group Identifiers (GIDs)

DNS under : Practical UNIX & Internet Security, 16.2.6.1. DNS under UNIX

encryption programs for

Practical UNIX & Internet Security, 6.6. Encryption Programs Available for UNIX
Practical UNIX & Internet Security, 6.6.3.6. PGP detached signatures

error numbers : sendmail, B.1. Status file lines

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

filesystem

Practical UNIX & Internet Security, 5. The UNIX Filesystem
Practical UNIX & Internet Security, 5.10. Summary

history of : Practical UNIX & Internet Security, 1.3. History of UNIX

kernels : TCP/IP Network Administration, 4.2.2. Defining the Subnet Mask

mailbox file : sendmail, 3.2.1. Delivery to a Mailbox

modems and

Practical UNIX & Internet Security, 14.5. Modems and UNIX
Practical UNIX & Internet Security, 14.5.3.3. Privilege testing

networking and : Practical UNIX & Internet Security, 16.1.2. Networking and UNIX

primary network services

Practical UNIX & Internet Security, 17.3. Primary UNIX Network Services
Practical UNIX & Internet Security, 17.3.23. Other TCP Ports: MUDs and Internet Relay Chat (IRC)

process scheduler

Practical UNIX & Internet Security, C.1.3.3. Process priority and niceness
(see also processes)

programming references : Practical UNIX & Internet Security, D.1.11. UNIX Programming and System Administration

published resources for : Practical UNIX & Internet Security, D.1. UNIX Security References

security and

Building Internet Firewalls, A.3.4. BugTraq
Practical UNIX & Internet Security, 1.4. Security and UNIX
Practical UNIX & Internet Security, 1.4.3. Add-On Functionality Breeds Problems

services : TCP/IP Network Administration, 2.7.2. Port Numbers

signals : Practical UNIX & Internet Security, C.3. Signals

starting up

Practical UNIX & Internet Security, C.5. Starting Up UNIX and Logging In
Practical UNIX & Internet Security, C.5.3. Running the User's Shell

systems

TCP/IP Network Administration, Foreword from the First Edition
TCP/IP Network Administration, 3.3.4. BIND, resolver, and named
TCP/IP Network Administration, 7.4.1. Routing Information Protocol
TCP/IP Network Administration, 7.5.3. Choosing a Routing Protocol
installation scripts for : TCP/IP Network Administration, 6.1.1. Determining the Interface Name

vendor, for security information : TCP/IP Network Administration, 12.1.2.2. Use mailing lists to distribute information

versions of

Practical UNIX & Internet Security, 1.3. History of UNIX
TCP/IP Network Administration, 3.2. The Host Table
TCP/IP Network Administration, 6.1. The ifconfig Command

viruses : (see viruses)

web server on : Practical UNIX & Internet Security, 18.2. Running a Secure Server

window system : Building Internet Firewalls, 2.13. Window Systems

UNIX and vendor-specific BIND implementations : DNS & BIND, 6.4. Vendor-Specific Options

UNIX commands

ability to use : TCP/IP Network Administration, 9.1. The Network File System

r-commands

TCP/IP Network Administration, 9.6. Managing Distributed Servers
TCP/IP Network Administration, 12.2.5. Secure the r Commands
disabling : TCP/IP Network Administration, 12.2.6. Secure Shell

tar : TCP/IP Network Administration, 9.7.1. POP Server

untar : TCP/IP Network Administration, 9.7.2. IMAP Server

UnixFromLine option

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

"unknown control line" message : sendmail, 5.1. Overview

unknown host error message

TCP/IP Network Administration, 11.3. Testing Basic Connectivity
TCP/IP Network Administration, 11.6. Checking Name Service

"Unknown host status version" message : sendmail, B.1. Status file lines

unknown local users : sendmail, 31.10. Alphabetized Reference

"unknown mailer" error : sendmail, 29.6. Rule Set 0

unknown query types : DNS & BIND, 7.6.2. Understanding the BIND Statistics

unlinked files : Practical UNIX & Internet Security, 25.2.2.7. Hidden space

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

unpacking BIND code : DNS & BIND, B.2. Unpack the Source Code

unpacking source code

sendmail, 2.1. Get the Source
sendmail, 18.3.1. What's Where in the Source

unplugging connections : Practical UNIX & Internet Security, 24.2.5. Getting Rid of the Intruder

unpredictability of randomness : Practical UNIX & Internet Security, 23.6. Tips on Generating Random Numbers

unqualified

addresses : sendmail, 16.5. Qualify All Addresses?

names

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

unquoted whitespace : sendmail, 13.2.8. The Unquoted Space Replacement Character

unreachable destinations, detecting : TCP/IP Network Administration, 1.5.2. Internet Control Message Protocol

"unreachable" message : DNS & BIND, 7.6.1. Common Syslog Messages

Unreachable Port message : TCP/IP Network Administration, 11.5.2. Tracing Routes

UnsafeGroupWrites option : sendmail, 34.8. Alphabetized Reference

"unspecified error" (nslookup) : DNS & BIND, 11.7.7. Unspecified Error

unused accounts

removing from system : TCP/IP Network Administration, 12.2.2. Choosing a Password
security problems with : TCP/IP Network Administration, 12.2.1. The Shadow Password File

update commands (nsupdate) : DNS & BIND, 10.3. DNS Dynamic Update

update data category (logging) : DNS & BIND, 7.5.3. Category Details

UPDATE messages : TCP/IP Network Administration, 7.5.2. Border Gateway Protocol

updating : TCP/IP Network Administration, 7.5.1. Exterior Gateway Protocol

aliases file : sendmail, 4.1.3. Rebuild Aliases Mode (-bi)
authorization files : DNS & BIND, 6.3.3. Updating .rhosts, hosts.equiv, etc.
db files : DNS & BIND, 7.2. Updating db Files
db.cache file : DNS & BIND, 7.2.6. Keeping db.cache Current
dynamically : DNS & BIND, 10.3. DNS Dynamic Update
glue records : DNS & BIND, 9.4.4. On the movie.edu Primary Master
named.root file : DNS & BIND, 4.2.9. The Root Cache Data

upgrading

BIND version : DNS & BIND, 13.4. Transition Problems
logging upgrades : Practical UNIX & Internet Security, 10.7.2.1. Exception and activity reports
sendmail : sendmail, 18.2. Vendor Versus Compiling

uploading programs on HTTP server : Building Internet Firewalls, 8.6.3.1. What can a malicious client do to

uploading stored information : Practical UNIX & Internet Security, 12.3.4. Protecting Local Storage

UPS (uninterruptable power system)

Practical UNIX & Internet Security, 2.2. Risk Assessment
Practical UNIX & Internet Security, 12.2.1.1. Fire
DNS & BIND, 8.5.2. Recommendations

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

urandom device : Practical UNIX & Internet Security, 23.7.4. Other random number generators

URLs (universal resource locators)

Building Internet Firewalls, 8.6. World Wide Web (WWW) and HTTP
TCP/IP Network Administration, 13.1. The World Wide Web

us domain : DNS & BIND, 3.2.2. Elsewhere in the World

USAGE messages : DNS & BIND, 7.6.1. Common Syslog Messages

usage profile : Building Internet Firewalls, 5.9.1. Learn What the Normal Usage Profile Is

use_ct_file feature : sendmail, 19.6. Alphabetized m4 Macros

use_cw_file feature : sendmail, 19.6. Alphabetized m4 Macros

UseErrorsTo (l) option : sendmail, 34.8. Alphabetized Reference

Usenet news

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

Practical UNIX & Internet Security, E.2. Usenet Groups

TCP/IP Network Administration, 13.5.1. Newsgroups

TCP/IP Network Administration, E.3.5. MAILER

cleanup scripts : Practical UNIX & Internet Security, 11.5.3. Abusing Automatic Mechanisms

encryption for : (see ROT13 algorithm)

newsgroups

Building Internet Firewalls, 2.4. Usenet News

TCP/IP Network Administration, 13.5.1. Newsgroups

defamation/harassment via : Practical UNIX & Internet Security, 26.4.7. Harassment, Threatening Communication, and Defamation

for security information : TCP/IP Network Administration, 12.1.2.2. Use mailing lists to distribute information

keeping current : Building Internet Firewalls, 12.3.1.2. Newsgroups

security resources via : Building Internet Firewalls, A.4. Newsgroups

using

TCP/IP Network Administration, 4.1.1. Network Contacts
TCP/IP Network Administration, 13.5.1. Newsgroups

posting breakins to : Practical UNIX & Internet Security, 24.6. Resuming Operation

reporting security holes on : Practical UNIX & Internet Security, 2.5.1. Going Public

USENIX Association : Building Internet Firewalls, A.6.1. USENIX Association

user accounts on bastion host : Building Internet Firewalls, 5.7. Don't Allow User Accounts on the

user authentication

TCP/IP Network Administration, 9.3.2. NIS+
TCP/IP Network Administration, 12.2. User Authentication

User Database

sendmail, 18.8. Alphabetized Reference
sendmail, 30.8. Alphabetized F= Flags
sendmail, 33.5. The User Database
sendmail, 33.8. Alphabetized Reference
sendmail, 34.8. Alphabetized Reference
rewrite : sendmail, 30.8. Alphabetized F= Flags

user database class : sendmail, 33.8. Alphabetized Reference

User Datagram Protocol (UDP)

Building Internet Firewalls, 6.3.3.2. UDP

Building Internet Firewalls, C.6.1. User Datagram Protocol

Practical UNIX & Internet Security, 16.2.4.3. UDP

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

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

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

TCP/IP Network Administration, 1.6. Transport Layer

(see also network services)

checksum errors in : TCP/IP Network Administration, 5.3.1.1. Options

packet relayer

Building Internet Firewalls, 7.6. Using SOCKS for
Building Internet Firewalls, B.4.3. UDP Packet Relayer
Practical UNIX & Internet Security, E.4.15. UDP Packet Relayer

user IDs : (see UIDs)

"User unknown" message : sendmail, 4.2. Verbose (-v)

UserDatabaseSpec (U) option

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

userdb database class : sendmail, 33.8. Alphabetized Reference

USERDB macro : sendmail, 18.8. Alphabetized Reference

USERFILE file (UUCP)

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

usermod command

Practical UNIX & Internet Security, 8.3. Restricting Logins
Practical UNIX & Internet Security, 8.4.3. Finding Dormant Accounts

usernames : Practical UNIX & Internet Security, 3.1. Usernames

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

capitalization : sendmail, 30.8. Alphabetized F= Flags

doubling as passwords (Joes) : Practical UNIX & Internet Security, 3.6.2. Smoking Joes

last command and : Practical UNIX & Internet Security, 10.1.3. last Program

as passwords : Practical UNIX & Internet Security, 8.8.3.1. Joetest: a simple password cracker

recipient's : (see $u macro)

special

Practical UNIX & Internet Security, 4.2. Special Usernames
Practical UNIX & Internet Security, 4.2.3. Impact of the /etc/passwd and /etc/group

using someone else's

Practical UNIX & Internet Security, 4.3. su: Changing Who You Claim to Be
Practical UNIX & Internet Security, 4.3.8. Other Uses of su

users

Practical UNIX & Internet Security, 4. Users, Groups, and the Superuser

Practical UNIX & Internet Security, 4.1. Users and Groups

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

(see also groups; su command)

$: operator and

sendmail, 9.2.3. The User ($:)
sendmail, 9.3. Testing Rule Set 0
sendmail, 29.6.1. Further Processing: $:user
sendmail, 30.5.3. The $: Part
sendmail, 33.4.1. Specify a Default with $:

alias delivery to : sendmail, 24.2.1. Delivery to Users

assigning passwords to : Practical UNIX & Internet Security, 8.8.1. Assigning Passwords to Users

auditing 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

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

checklist for : Practical UNIX & Internet Security, A.1.1.2. Chapter 3: Users and Passwords

dormant accounts and

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

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

.forward file : sendmail, 22.5.3. Permissions for ~/.forward Files

groups : sendmail, 18.8. Alphabetized Reference

identities of : (see also UIDs)

default

sendmail, 13.2.5. The Default User Identities
sendmail, 22.8.3.1. The DefaultUser option
sendmail, 34.8. Alphabetized Reference

proving : Practical UNIX & Internet Security, 19.3.1.1. Proving your identity

recognizing as intruders

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

taking someone else's

Practical UNIX & Internet Security, 4.3. su: Changing Who You Claim to Be
Practical UNIX & Internet Security, 4.3.8. Other Uses of su

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

including oneself on mailing lists : sendmail, 34.8. Alphabetized Reference

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

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

limited : Practical UNIX & Internet Security, 8.1.5.1. Limited users

local : sendmail, 31.10. Alphabetized Reference

accepting mail from only : sendmail, 20.2.1. Accept Mail Only From Our Domain

delivery to

sendmail, 3.2. Role in Local Delivery
sendmail, 19.6. Alphabetized m4 Macros
sendmail, 29.6.3. Delivering to Local Recipient
sendmail, 30.8. Alphabetized F= Flags

logging

Practical UNIX & Internet Security, 10.4. Per-User Trails in the Filesystem
Practical UNIX & Internet Security, 10.4.3. Network Setup

mailing list instructions for : sendmail, 25.5.4. Users Ignore list-request

marked with + : sendmail, 24.4.3. Plussed Users

NIS passwords for : Practical UNIX & Internet Security, 19.3.2.1. Creating passwords for users

nobody (Secure RPC) : Practical UNIX & Internet Security, 19.3.2.1. Creating passwords for users

notifying about monitoring : Practical UNIX & Internet Security, 26.2.6. Other Tips

passwords : (see passwd file; passwords)

recipient of bounced mail : (see $n macro)

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

root : (see root account/user; superusers)

running sendmail manually : sendmail, 1.4. Run sendmail by Hand

security responsibilities : TCP/IP Network Administration, 12.1.3. Writing a Security Policy

semiprivileged : sendmail, 22.5. Permissions

sending messages to : Practical UNIX & Internet Security, 10.5.1. The syslog.conf Configuration File

summarizing system usage by : Practical UNIX & Internet Security, 25.2.2.2. quot command

tainting : Practical UNIX & Internet Security, 18.2.3.4. Tainting with Perl

training : Practical UNIX & Internet Security, 13.2.1. Initial Training

trusted

sendmail, 5.3.10. Trusted Users
sendmail, 14.6. Trusted User
sendmail, 19.6. Alphabetized m4 Macros
sendmail, 22.8.1. Trusted Users
sendmail, 32.5. Alphabetized Reference

unattended terminals

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

unavailable : (see undeliverable addresses in aliases)

USERFILE entries for : Practical UNIX & Internet Security, 15.4.1.2. USERFILE entries for local users

verifying with SMTP : sendmail, 22.3.2. SMTP vrfy and expn

www : Practical UNIX & Internet Security, 18.2.2. Understand Your Server's Directory Structure

users command

Practical UNIX & Internet Security, 10.1.2. utmp and wtmp Files
Practical UNIX & Internet Security, 24.2.1. Catching One in the Act

USESETEUID macro : sendmail, 18.8. Alphabetized Reference

USG (UNIX Support Group) : Practical UNIX & Internet Security, 1.3. History of UNIX

/usr directory

Practical UNIX & Internet Security, 4.3.7. The Bad su Log

(see also /var directory)

/usr/etc/bootpd file : TCP/IP Network Administration, 9.6.1. rdist

/usr/sbin/imapd file : TCP/IP Network Administration, 9.7.2. IMAP Server

/usr/src/linux source directory : TCP/IP Network Administration, 5.2. Linux Kernel Configuration

/usr/src/sys/i386/conf directory : TCP/IP Network Administration, 5.3. The BSD Kernel Configuration File

/usr/tmp/gated_dump file : TCP/IP Network Administration, B.1.1. Signal Processing

/usr/adm directory : Practical UNIX & Internet Security, 11.5.3.6. Other files

/usr/adm/messages file, in security checks

Practical UNIX & Internet Security, 10.2.3. messages Log File
TCP/IP Network Administration, 12.4.2.2. Checking login activity

/usr/adm/lastlog file : Practical UNIX & Internet Security, 10.1.1. lastlog File

/usr/bin directory

Practical UNIX & Internet Security, 11.1.5. Viruses
Practical UNIX & Internet Security, 11.5.1.1. PATH attacks
backing up : Practical UNIX & Internet Security, 7.1.2. What Should You Back Up?
/usr/bin/uudecode : (see uudecode program)

/usr/etc/resolv.conf : (see resolv.conf file)

/usr/etc/yp/makedbm program : Practical UNIX & Internet Security, 19.4.4.1. Setting up netgroups

/usr/lib directory : Practical UNIX & Internet Security, 11.5.3.6. Other files

in restricted filesystems : Practical UNIX & Internet Security, 8.1.5. Restricted Filesystem

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

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

/usr/lib/sendmail : (see sendmail)

/usr/lib/uucp/Devices file : Practical UNIX & Internet Security, 14.5.1. Hooking Up a Modem to Your Computer

/usr/lib/uucp directory

Practical UNIX & Internet Security, 15.4.2.1. Some bad examples
Practical UNIX & Internet Security, 15.5.2. Permissions Commands

/usr/lib/uucp/L-devices file : Practical UNIX & Internet Security, 14.5.1. Hooking Up a Modem to Your Computer

/usr/lib/uucp/L.cmds file : (see L.cmds file)

/usr/lib/uucp/L.sys file : Practical UNIX & Internet Security, 15.3.3. Security of L.sys and Systems Files

/usr/lib/uucp/Permissions file : (see Permissions file)

/usr/lib/uucp/Systems file : Practical UNIX & Internet Security, 15.3.3. Security of L.sys and Systems Files

/usr/lib/uucp/USERFILE file

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

/usr/local/bin directory

Practical UNIX & Internet Security, 1.1. What Is Computer Security?
Practical UNIX & Internet Security, 11.5.1.1. PATH attacks
/usr/local/etc/http/logs directory : Practical UNIX & Internet Security, 10.3.5. access_log Log File
/usr/local/lib directory : Practical UNIX & Internet Security, 11.5.3.6. Other files

/usr/sbin/rexecd : (see rexec service)

/usr/spool/cron/crontabs directory : Practical UNIX & Internet Security, 15.6.2. Automatic Execution of Cleanup Scripts

/usr/spool/uucp directory : Practical UNIX & Internet Security, 15.1.4. How the UUCP Commands Work

/usr/spool/uucppublic : (see uucppublic directory)

/usr/tmp directory : sendmail, 18.8. Alphabetized Reference

/usr/ucb directory : Practical UNIX & Internet Security, 11.1.5. Viruses

USR1 and USR2 signals

DNS & BIND, 7.1. BIND Name Server Signals
DNS & BIND, 7.5. BIND 8 Logging
DNS & BIND, 12.2.2. Changing the Debugging Level with Signals

usrerr() : sendmail, 20.2.1. Accept Mail Only From Our Domain

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

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

utimes commandn : Practical UNIX & Internet Security, 24.5.1. Never Trust Anything Except Hardcopy

utmp file

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
Practical UNIX & Internet Security, 24.2.1. Catching One in the Act
Practical UNIX & Internet Security, 24.2.4. Tracing a Connection

uucheck program : Practical UNIX & Internet Security, 15.5.3. uucheck: Checking Your Permissions File

uucico program

Practical UNIX & Internet Security, 15.1.4. How the UUCP Commands Work
Practical UNIX & Internet Security, 15.3. UUCP and Security
Practical UNIX & Internet Security, 15.5.1.1. Starting up

UUCP (UNIX-to-UNIX Copy Protocol)

Building Internet Firewalls, 2.2. File Transfer

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

Practical UNIX & Internet Security, 14.5. Modems and UNIX

Practical UNIX & Internet Security, 15. UUCP

Practical UNIX & Internet Security, 15.1.1. uucp Command

Practical UNIX & Internet Security, 15.9. Summary

Practical UNIX & Internet Security, 17.3.20. UUCP over TCP (TCP Port 540)

sendmail, 3.3.2. UUCP

sendmail, 8.1.4. UUCP and Host Paths

sendmail, 19.6. Alphabetized m4 Macros

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

TCP/IP Network Administration, 5.4. The Internet Daemon

TCP/IP Network Administration, 10.5.8. Defining Mailers

additional logins : Practical UNIX & Internet Security, 15.3.1. Assigning Additional UUCP Logins

addresses

sendmail, 17.1.4. UUCP Addresses
sendmail, 17.4. Rule Set 4

bang syntax : TCP/IP Network Administration, 10.7.1. Modifying Local Information

BNU

Practical UNIX & Internet Security, 15.2. Versions of UUCP
Practical UNIX & Internet Security, 15.5. Security in BNU UUCP
Practical UNIX & Internet Security, 15.5.3. uucheck: Checking Your Permissions File

checklist for : Practical UNIX & Internet Security, A.1.1.14. Chapter 15: UUCP

cleanup scripts

Practical UNIX & Internet Security, 11.5.3. Abusing Automatic Mechanisms
Practical UNIX & Internet Security, 15.6.2. Automatic Execution of Cleanup Scripts

configuring : Building Internet Firewalls, 8.2.4. UNIX-to-UNIX

early security problems : Practical UNIX & Internet Security, 15.7. Early Security Problems with UUCP

eliminating support of : sendmail, 19.6. Alphabetized m4 Macros

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

$k macro : sendmail, 31.10. Alphabetized Reference

local handling of : sendmail, 29.6.5. Handling UUCP Locally

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

m4 configuration options : sendmail, 19.4.6. UUCP

macros for repays : sendmail, 31.10. Alphabetized Reference

mail forwarding : Practical UNIX & Internet Security, 15.6.1. Mail Forwarding for UUCP

naming computer : Practical UNIX & Internet Security, 15.5.2. Permissions Commands

over networks : Practical UNIX & Internet Security, 15.8. UUCP Over Networks

NFS server and : Practical UNIX & Internet Security, 15.3. UUCP and Security

passwords for : Practical UNIX & Internet Security, 15.3.2. Establishing UUCP Passwords

sites, serving

TCP/IP Network Administration, E.3. m4 sendmail Macros
TCP/IP Network Administration, E.3.5. MAILER

system connected with : TCP/IP Network Administration, 10.5.3. The Define Class Command

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

over TCP : Practical UNIX & Internet Security, 17.3.20. UUCP over TCP (TCP Port 540)

Version 2

Practical UNIX & Internet Security, 15.2. Versions of UUCP
Practical UNIX & Internet Security, 15.4. Security in Version 2 UUCP
Practical UNIX & Internet Security, 15.4.3. L.cmds: Providing Remote Command Execution

uucp (user)

Practical UNIX & Internet Security, 4.1. Users and Groups
Practical UNIX & Internet Security, 4.2.2. Other Special Users

UUCP, DNS with : DNS & BIND, 1.5.2. If you have a UUCP connection to a host on the Internet...

UUCP-style lock files

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

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

uucpa account : Practical UNIX & Internet Security, 15.3.1. Assigning Additional UUCP Logins

uucpd program : Practical UNIX & Internet Security, 15.8. UUCP Over Networks

uucpdomain feature : sendmail, 19.6. Alphabetized m4 Macros

uucppublic directory

Practical UNIX & Internet Security, 15.1.1. uucp Command
Practical UNIX & Internet Security, 15.4.1.3. Format of USERFILE entry without system name
Practical UNIX & Internet Security, 15.5.2. Permissions Commands

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

uudecode program

Practical UNIX & Internet Security, 17.3.4.2. Using sendmail to receive email
sendmail, 22.6. The Aliases File

uuencode program

Practical UNIX & Internet Security, 6.6.1.2. Ways of improving the security of crypt
sendmail, 22.6. The Aliases File

uux command

Practical UNIX & Internet Security, 15.1.2. uux Command
Practical UNIX & Internet Security, 15.1.4. How the UUCP Commands Work

uuxqt program : Practical UNIX & Internet Security, 15.4.1.3. Format of USERFILE entry without system name

uuxqtcmds files : Practical UNIX & Internet Security, 15.4.3. L.cmds: Providing Remote Command Execution

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