Index_S

S

Samba

configuration

files, 378, 379

SWAT, 380, 381, 382, 383, 384, 385, 386, 387

utilities, 378, 379

installation, 376

SWAT, 380, 381

overview, 376

shares

configuration, 383, 384

smbclient utility, 384, 385

smbmount utility, 385, 386

start/stop, 377, 378

SWAT

adding users, 383

initial use, 382, 383

share configuration, 383, 384

starting, 381

users

adding, 383

scheduling

kernel and, 521

tasks

processes, 240, 241

scp (secure copy), OpenSSH suite, 475, 476

screen

resolution

desktop, 41

screensaver

desktop configuration, 78

scripts

shell, 241

constructs, 242, 243, 244

loops , 245, 246

variables , 241, 242

search path , 54

searches

files, 58, 59

find command, 184, 185, 186

GNOME search tool, 186

locate command, 183, 184

log files, 496, 497

System Log and, 496

strings

grep command, 187

text, 187, 188, 189

xargs command, 187

security

alerts, 480

Bugtraq mailing list, 481

CERT, 481

Red Hat Errata Web site, 481

Apache Web server, 345

daemons, 440

data transfer, 409

encryption, 418, 419, 420, 421, 422, 423, 424, 425, 426, 427, 428, 429

GPG (GNU Privacy Guard), 419, 420, 421, 422, 423, 424

GPG (GNU Privacy Guard), 307

hacking, 408

hardware, 410, 411

RAID, 410

hardware failure and, 408

Internet connections, 103

local security, 411, 412

logging out, 481

monitoring

system logs, 429, 430, 431, 432, 433

Mozilla settings, 111

network services, 440

enabling/disabling, 440, 441, 442, 443, 444, 445

monitoring, 446, 447

networks

firewalls, 452, 453, 454, 455, 456, 457

IP traffic, 448, 449, 450, 452

ssh and, 470, 471, 472, 473, 474, 475, 476

VPNs, 457, 458, 459, 460, 461, 462, 463, 464, 467, 469, 470

operator error and, 408

overview, 407

passwords, 412

cracking, 413, 414, 416, 417, 418

hashes, 412

selecting strong, 412, 413

physical threats, 409

planning

threats, 408, 409, 410

value of files, 408

probing (hacking), 408

root account and, 412

RPM and, 292

RPM packages, 306, 307

script errors, 412

SELinux. See SELinux

Service Configuration application, 443, 444

services, 440

system integrity, 434

Tripwire, 434, 435, 436, 437, 438, 439

threats

countering , 410, 411, 412, 413, 414, 416, 417, 418

trojans, 409

verification, 418, 419, 420, 421, 422, 423, 424, 425, 426, 427, 428, 429

signed packages, 308

verification and, 481

viruses, 409

worms, 409

security directory, 491

Security Level Configuration, firewall configuration, 454

SELinux (Security Enhanced Linux), 476, 478

commands, 479, 480

online resources, 480

overview, 478, 479

policy rules, 480

sending e-mail

Perl, 552, 553, 554, 555, 556, 557

Sendmail

configuration, 390, 391, 392

testing, 393

e-mail

client setup, 394

receiving messages, 396, 397

sending messages, 396

installation, 389

MDA, 394

POP3 service, 395

reasons to use, 389

starting, 392

Server configuration, 1

servers

configuration, 343

DHCP server

setup, 397, 398, 399, 400, 401, 402, 403, 405

file servers

setup, 375, 376, 377, 378, 379, 380, 381, 382, 383, 384, 385, 386, 387

FTP servers

setup, 361, 362, 363, 364, 365, 366, 367, 368, 369, 370

key servers, 425

mail servers

setup, 388, 389, 390, 391, 392, 393, 394, 395, 396, 397

print servers

setup, 370, 371, 372, 373, 374, 375

Web server

Apache configuration, 349, 351

setup, 343, 344, 345, 347, 349, 350, 351, 352, 353, 354, 355, 356, 357, 358, 359, 360

site setup, Apache, 351, 352

Web servers

Apache, 345, 347, 348, 349

Service Configuration application, 443, 444

services, 82

networks

enabling/disabling, 440, 441, 442, 443, 444, 445

monitoring, 446, 447

run levels, 82

security and, 440

selecting, 82

xinetd, 445

setuid permissions, 179

SFTP (Secure FTP), 361

shadow password file, 412

shadow passwords

/etc/shadow and, 492

shared libraries

/etc/ld.so.conf and, 490

shares, Samba

configuration, 383, 384

shell, 54, 212

as command line interface, 211

Bash, 212

Bourne shell, 212

built-in programs, 214

C-shell, 212

commands, 214

absolute path, 215

administrative, 222, 223, 224

directories, 216, 217

files, 217

filesystem, 215, 216, 217, 218, 219

process management, 219, 220, 221

relative path, 215

working directory, 215

configuration, 236

prompt, 237

external programs, 214

Korn shell, 212

user account modification, 269

shell scripts, 241

conditional constructs, 242, 243, 244

loops, 245, 246

variables, 241, 242

shells

listing

/etc/shells and, 492

shortcut buttons

panel, 39

shortcuts, 224, 225, 226, 227, 228

applications, 45, 46

auto-completion, 227, 228

icons

size , 46

panel

adding to, 45

shut down, 222

shut down computer, 50, 51

shutdown command, 222

signatures

public keys, 427

verifying, 481

signed packages

verification, 308

site certificates

verifying, 481

size

files, 181

skel directory, 492

smbclient utility, 384, 385

smbmount utility, 385, 386

SMTP (Simple Mail Transfer Protocol), 389

sockets

SSH directories, 171

soft links, 173, 174, 175

software

installation needs, 2

sound

desktop configuration, 78

sound cards

information detection, 71

settings, 32

source code

access, 583, 584, 585, 586

applications

building, 515, 516, 517, 518

applications from, 513, 514, 516, 517, 518

checking out, CVS, 583, 584

development tools and

installing, 514

libraries

installing, 514

module building, 584, 585

patch creation, 585, 586

special keys, 224, 225, 226, 227, 228

split function, Perl, 550

Spreadsheet software icon, 45

spreadsheets. See OpenCalc

ssh

network security, 470, 471, 472, 473, 474, 475, 476

connection setup, 471, 472, 473, 474, 475

SSH (Secure Shell) directories

sockets, 171

SSL (Secure Sockets Layer), 141

Apache Web server

configuration, 354, 355

startup, 359, 360

OpenSSL software

Apache Web server installation and, 353, 354, 355, 356, 357, 358, 359, 360

startup

Apache

initial, 347, 348, 349

startup scripts

/etc/init.d and, 489

static addresses

Internet connection, LANs, 99

static IP addresses

DHCP server and, 402, 403

stream editor

text searches, 188

strict, 548

strings

searches

grep command, 187

strong password selection, 412, 413

su command, 222

root user and, 283, 284, 285

subject, e-mail

Perl, 556, 557

substitutions in command line, Perl, 564, 565, 566

sudo command

root user and, 286, 287

super block, partitions, 208

swap partitions, 207

SWAT

initial use, 382, 383

installation, 380, 381

shares

configuration, 383, 384

starting, 381

users

adding, 383

SWAT (Samba Web Administration Tool)

Samba configuration, 380, 381, 382, 383, 384, 385, 386, 387

switching identities, 222

symbolic links, 173, 174, 175

SYN flag, TCP packets, 452

Synaptic, 332, 334

syntax

command line, 228

operator, 235

& operator, 235

<#62> operator, 234

<#62><#62> operator, 234

<<> operator, 233

aliases, 231, 232

environment variables, 232

file globbing, 228, 229, 230

I/O redirection, 233

I/O streams, 233

quotes, 230, 231

system-defined variables, 232

user-defined variables, 232

xargs operator, 235

Perl, 554

sysadmin application, 590, 591

sysconfig directory, 492

syslogd daemon, 498

system accounts, 258

FTP server authentication testing, 368

system administration

GWCC (GNOME Workstation Command Center), 591, 592

RT (Request Tracker), 594

Webmin, 593, 594

system administration applications

future of Linux, 590, 591, 593, 594

system applications

emulators, 166, 167

file compression/archiving, 164, 165

file management, 163, 164

text editor, 163

system command

Perl, 563, 564

system configuration, 485

configuration files, 487

/etc/aliases, 487

/etc/bashrc, 487

/etc/crontab, 487

/etc/csh. cshrc , 487

/etc/default/useradd, 488

/etc/fstab, 488

/etc/ group , 488

/etc/grub.conf, 488

/etc/ hosts , 489

/etc/hosts.allow, 489

/etc/hosts.deny, 489

/etc/init.d, 489

/etc/inittab, 490

/etc/issue, 490

/etc/issue.net, 490

/etc/ld.so.conf, 490

/etc/logrotate.conf, 490

/etc/ modprobe .conf, 491

/etc/passwd, 491

/etc/rc, 491

/etc/resolv.conf, 491

/etc/security, 491

/etc/shadow, 492

/etc/shells, 492

/etc/skel, 492

/etc/sysconf, 492

/etc/sysctl.conf, 492

/etc/syslog.conf, 493

/etc/X11/xorg.conf, 487

/etc/xinetd.conf, 493

DNS server, locating, 486

system integrity, 434

Tripwire, 434, 435, 436, 437, 438

database update, 439

running automatically, 438

system load, Perl, 558, 559, 560, 561, 562, 563, 564, 565, 566, 568, 569

system logs

security monitoring, 429

/var/log directory, 430

logwatch tool, 430, 431, 432, 433

System Logs application, 496

system-defined variables

command line syntax, 232