|Exam Name||:||Administration of Veritas Cluster Server(R) 6.0 for Unix|
|Questions and Answers||:||235 Q & A|
|Updated On||:||June 14, 2019|
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Test Name : Administration of Veritas Cluster Server(R) 6.0 for Unix
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continuing with part 2 of this two-article collection, Joseph Dries helps you proceed to expand upon your list of basic safety approaches by using taking a look at UNIX/Linux hardening, preserving your servers from community based mostly TCP/IP assaults, and applying centralized logging servers.
this text become excerpted from The Concise e book to commercial enterprise Internetworking and security."A industrial, and in some respects a social, doubt has been began in the last year or two, no matter if or now not it's appropriate to talk about so overtly the security or insecurity of locks. Many well-which means men and women believe that the discussion respecting the capacity for baffling the supposed safeguard of locks presents a top rate for dishonesty, by showing others how to be dishonest. here's a fallacy. Rogues are very eager of their occupation, and already understand lots more than we will teach them respecting their a few forms of roguery. Rogues knew a superb deal about lockpicking long before locksmiths discussed it amongst themselves, as they have got currently executed. If a lock—let it have been made in anything nation, or by using whatever thing maker—isn't so inviolable because it has hitherto been deemed to be, certainly it is in the interest of honest folks to grasp this fact since the dishonest are tolerably certain to be the first to apply the expertise nearly; and the spread of potential is integral to deliver fair play to people that may endure with the aid of lack of know-how. It cannot be too earnestly advised, that an acquaintance with real facts will, within the conclusion, be greater for all parties." —Charles Tomlinson's "Rudimentary Treatise on the development of Locks," posted round 1850
It has been mentioned that the surprising issue about requirements is there are such a lot of to choose from. The equal option is obtainable within the UNIX area. There are two simple flavors, BSD-derived and AT&T gadget V-derived. BSD-derived UNIX techniques consist of OpenBSD, FreeBSD, NetBSD, BSDi, MacOS X, and SunOS 4. device V-derived UNIX programs include HP-UX and Solaris (SunOS 5). other UNIX programs, similar to AIX, provide commands as a way to act BSD-ish or device V-ish, depending on how they have been invoked. Linux isn't derived from any UNIX, but reckoning on the distribution, borrows from both BSD and gadget V semantics. in fact, Linux itself is barely the operating gadget kernel and aiding drivers. Most Linux distributions use the GNU equipment (http://www.gnu.org), as a result they are called GNU/Linux distributions. There are tons of of available GNU/Linux distributions, however even the "excellent 5" are different in their default instructions, startup scripts, filesystem design, included utilities, and packaging methods.
What does this imply to you? in contrast to windows NT, together with windows 2000, it's a far more complicated procedure to describe the way to harden a UNIX/Linux server. This subsequent section offers some regular procedures that will also be applied across UNIX types and GNU/Linux distributions. Following which are some tips to residing files on the internet, which music available information and releases, and go into a more designated account of the way to harden a server for a selected task.ordinary Steps for Hardening UNIX/Linux Servers
The process of constructing a UNIX or GNU/Linux server for use as a firewall or DMZ server starts off with setting up. disposing of points of attack, equivalent to filling the filesystem, or removing pointless libraries and functions, is reminiscent of getting rid of feasible entry facets for intruders.
Some normal instructions for configuring UNIX servers with a greater comfy default stance can be found from CERT's net site at ftp://info.cert.org/pub/tech_tips/UNIX_configuration_guidelines.Partition for protection
anyway having separate partitions for the glaring, corresponding to SWAP and /tmp, make sure to deliver protection to towards out-of-disk-area denial-of-service assaults. Intruders may are attempting to create excessive technology of logging data or fill your file system with colossal info through FTP or mail spool. The top of the line way to deliver protection to in opposition t here's to section the filesystem hierarchy into separate real partitions.
the root partition / can be small since it often incorporates just the kernel—the critical information, libraries, and configuration for booting in /bin, /sbin, /and so forth, and /lib. entry to the attached devices is equipped during the /dev and /gadgets directories. Many GNU/Linux distributions store kernels and symbol data within the /boot listing, whereas kernel libraries are stored below /lib.
The /usr partition is normally where consumer-accessible functions are kept. perpetually, /usr does not include information or configuration files that alternate; for this reason, an delivered security measure will also be installed as read-only.
The /var partition retailers gadget logs and information capabilities comparable to mail, web, databases, printing, working functions, package management, and so on. On a mail server, you might are looking to make /var/spool/mail, or /var/mail in Solaris, a separate partition, or—even greater—a separate disk array. in case you handiest create one separate partition from /, /var is the one remember to separate.
The /usr/local directory structure, and in Solaris the /decide listing, frequently carries in the community installed not obligatory application, configuration files, and statistics. /usr/local is perpetually now not affected by working gadget improvements. depending on how you use those directories, they too will also be hooked up as examine-simplest.
These are information and guidelines handiest, and are different from suggested settings for a equipment that consists of consumer money owed, usually in /domestic.Disable Extraneous inetd functions
inetd is the UNIX "cyber web tremendous Server." it is a daemon procedure that's invoked at boot time and reads in a flat file configuration database always discovered at /and so on/inetd.conf. inetd listens for incoming connections on the described IP ports. When a connection is initiated on a defined port, it invokes the configured software to service the request. After the connection is finished, the manner invoked to carrier that request terminates. This was at the start designed to lighten the burden and substances required for systems.
There are a number of functions enabled via inetd, and just about all of them should be disabled for constructing firewalls and DMZ servers. anyway continually disabling FTP, TFTP, Telnet, and the Berkeley r* instructions, disable the following:
in.named—BIND name services daemon. except for your DNS servers, be sure to not be running DNS in your firewall or DMZ servers.
in.fingerd—Finger daemon that may also be used to display user tips and lists of clients who are logged in. There is no reason to advertise that information to would-be intruders.
daylight—Connections to this provider display the date and time on the device in a string layout. Getting the date and time of a system is constructive for an intruder making an attempt to enforce replay assaults.
time—Connections to this provider return the time as a 32-bit price representing the variety of seconds considering hour of darkness 1-Jan-1900. do not deliver intruders together with your accurate gadget time.
echo—this is a diagnostic provider that echoes incoming statistics lower back to the connecting desktop.
discard—this is a diagnostic carrier that doesn't echo (as a result discarding) the incoming facts circulation back to the connecting machine.
chargen—here's a diagnostic provider that instantly generates a circulation of characters sent to the connecting laptop.
systat—Connections to this provider supply a list of all techniques and their popularity.
netstat—Connections to this provider supply a listing of latest network connections and their popularity.
set up and configure Wietse Venema's tcp_wrappers on both your firewall and DMZ servers. tcp_wrappers allows you to define access handle to a lot of features, depending on a limited set of criteria, akin to username, IP handle, or DNS domain.
You might possibly be asking why it's integral to configure and deploy extra products when your firewall may be doing the identical factor. and that is the reason a legitimate question. The answer is to avoid single aspects of failure, and to supply safety in layers. If one layer is pierced and bypassed, different layers might be standing protect at the back of the breach.
tcp_wrappers are light-weight and intensely useful on inside servers; not simply on firewalls and DMZ servers. bear in mind that almost all assistance safety breaches, intentional or accidental, ensue internally. it be handiest the external defacements, big distributed denial of carrier (DDoS) assaults, virus-du-jour, and stolen credit card databases that grab the clicking. That, and misplaced tough drives with totally delicate nuclear information.
tcp_wrappers have two leading files that permit access to the for my part described services. here two information are checked for guidelines governing access to particular person or wildcard functions:/and so forth/hosts.allow /and many others/hosts.deny
Like most firewalls, entry is granted or denied on the first matching rule. The rules are checked in order, first in hosts.permit after which in hosts.deny.
Care should still be taken when using the general or UNKNOWN wildcards. ALL will at all times in shape something criteria you're trying out. read the hosts_access manual page covered with tcp_wrappers for additional particulars on syntax and rules setup.
tcp_wrappers is put in and configured with the aid of default on most GNU/Linux distributions and BSD releases. For these UNIX techniques that won't have tcp_wrappers put in by way of default, they can also be found at ftp://ftp.porcupine.org/pub/protection/index.html. Retrieve the source, assemble, and install the binaries on the servers.Lock Down Your DNS Server
The Berkeley internet name Daemon, or BIND, is the reference implementation of the name provider featuring DNS for the web. The internet software Consortium (ISC) is liable for enforcing and holding BIND. There are three fundamental types of BIND: BIND four, BIND eight, and (currently) BIND 9.
BIND 4 has been round invariably, and has its share of exploits. most effective very ancient versions of UNIX programs and GNU/Linux distributions came with BIND four. still, you'll be surprised how many installations nevertheless have the older BIND four operating. be sure to upgrade to a more latest edition of BIND. The unlucky element is that the file structure defining the zones served with the aid of the server has modified. There are conversion scripts, but there is certain to be some hand editing.
BIND 8 is the present strong free up, and presents many greater points and more advantageous control and granularity in access handle. The settings described later are discussed with BIND 8 in mind.
BIND 9 was launched late in 2000. It presents many new features, such as IPv6 assist, DNSSEC, full Dynamic DNS, incremental zone transfers, distinct views (internal, exterior, etc) from a single server, and scalability improvements. If any of those points are essential to your configuration, make sure you investigate the usage of BIND 9; otherwise, it's top-quality left to the adventurous.
although just about all UNIX programs and GNU/Linux distributions come with BIND as the name server, it's critical you be sure you're at a suggested liberate. earlier than deploying a DNS server, internally or on the DMZ, make sure it's at least edition eight.2.2-P5. Any edition prior to that has critical exploits. This warning may still no longer be omitted. The information superhighway software Consortium themselves have issued a statement that if you're running any edition of BIND ahead of 8.2.2-P5, you should definitely count on your server has already been compromised. verify your UNIX equipment or GNU/Linux distribution. If the edition of BIND is not at the least 8.2.2-P5, discuss with your supplier for improvements. If an upgrade isn't attainable, you can compile a edition of BIND your self on a laptop, and deploy the binaries on your server. The source code may also be found at http://www.isc.org/products/BIND/.
First, restrict zone transfers to selected secondary servers on your simple zones. The acl command allows you to outline an entry control record composed of blocks of addresses for use with a named identifier. the usage of ACLs provides a self-documenting formulation of administrating the named.conf configuration file. In here instance, we outline two ACLs comprising our externally seen DNS servers and the secondary servers at our ISP:acl your-enterprise-dns 172.16.30.12; 172.sixteen.30.24; ; acl your-ISP-dns 126.96.36.199; 188.8.131.52; ;
here allow-transfer alternative directive placed to your named.conf file will default all described zones to best enable transfers for the defined hosts:options enable-transfer your-enterprise-dns; your-ISP-dns; ; ;
that you would be able to override the permit-switch commentary within the options directive with the aid of placing the enable-transfer remark within the zone definition:zone "yourdomain.com" class grasp; file "db.yourdomain-com"; allow-switch 172.sixteen.30.12; 192.168.seventy one.200; ;
The default allow-switch choice will prevent zone transfers to hosts now not specified within the ACLs. despite the fact, in case you want to avert all zone transfers on your secondary servers and any secondary zones for your primary servers, use predefined match list none. This can also be accomplished with here permit-switch directive to your zone definitions:zone "yourdomain.com" category slave; file "db.yourdomain-com.s"; masters 192.168.seventy one.1; ; enable-switch none; ; ;
finally, because you might be permitting recursive queries via your servers, it's most advantageous to permit entry handle lists to your internal networks. the usage of a nested, named acl with the enable-question option in the zone definition, you could then restrict recursive queries to inside hosts most effective as viewed in the following instance:acl inner-net 192.168.seventy one.0/24; ; acl dmz-web 172.16.30.0/24; ; acl depended on-hosts localhost; inside-internet; dmz-net; ; zone "yourdomain.com" category master; file "db.yourdomain-com" enable-question relied on-hosts; ; ;
Que's Concise guide to DNS and BIND with the aid of Nicolai Langfeldt is a phenomenal resource to further grok BIND configuration and renovation.Tighten Sendmail Default alternate options
ship mail comes with virtually each UNIX/Linux installation as the default mail transfer agent (MTA). on account of being so largely put in, it has been estimated that sendmail handles a majority of the email on the information superhighway. because it runs as suid root, sendmail exploits affect hundreds of thousands of machines.
sendmail edition eight.11.0 is accessible on the time of publication, and supports new points reminiscent of STARTTLS and SMTP AUTH encryption. upgrade to the newest version accessible, if feasible, but please make certain that you're operating a edition no later than edition 8.9.3 as a result of safety exploits.
To allow the Realtime Blackhole listing characteristic, use right here on your sendmail.mc file:characteristic(rbl)dnl
additionally, you might wish to disable the SMTP VRFY and EXPN commands in sendmail. These instructions are often used via intruders to accumulate tips about your equipment:outline(´confPRIVACY_FLAGS', ´novrfy,noexpn')dnl
There are a couple of extra flags that you could set to make sendmail have a extra secure stance:
authwarnings—Add X-Authentication-Warning header in messages on definite situations that may point out mail equipment spoof attempts.
needmailhelo—Require that the sending web site uses the SMTP HELO command first when connecting to ship e mail.
needexpnhelo—Require that the sending web site makes use of the SMTP HELO command earlier than permitting any EXPN utilization.
needvrfyhelo—Require that the sending web page uses the SMTP HELO command before permitting any VRFY utilization.
noreceipts—Disable beginning fame Notification (DSNs) of birth and read receipts.
goaway—Set all flags apart from restrictmailq and restrictqrun.
restrictmailq—stay away from clients from the usage of the mailq command to view the contents of the mail queue.
restrictqrun—cease users from processing the queue.
in line with its web page, Postfix's dreams are "to be quickly, effortless to manage, and secure, whereas at the identical time being sendmail suitable enough to now not upset existing clients."
Postfix changed into basically written by using Wietse Venema of tcp_wrappers repute. Postfix changed into designed to be modular, therefore Postfix is not a single executable like sendmail; quite, Postfix includes a collection of specialized classes that function specific projects. all of the classes apart from the master manage process (oddly known as master since it runs without root privilege) run as nonprivileged users, limiting the damage an attacker can inflict on your gadget. as a result of the pace, ease of configuration (and thus much less possibility of misconfiguration), and security, it's informed that you just examine replacing sendmail with Postfix. For those of you who do not dream in sendmail.cf syntax, Postfix will make e mail administration each less demanding and greater cozy.
Postfix is now allotted with most GNU/Linux and BSD releases, although it is not often installed with the aid of default. always, it's a simple count number of setting up it by the use of your equipment administration system, or (in the BSD case) via the ports collection.
when you are using an working gadget that does not distribute Postfix, despair now not. that you would be able to download and compile the sources with ease on a development laptop after which installation the binaries in your mail server. The sources, FAQs, and documentation can also be discovered at http://www.postfix.org/Linux-selected initiatives
there are many GNU/Linux distributions obtainable. each seller has its own installing process, which usually adjustments between new models of the dealer's distribution. The "forerunners" of GNU/Linux distributions are pink Hat, SuSE, TurboLinux, Mandrake, Caldera, Slackware, and Debian. That does not mean in particular that remember to use anyone of them because the high number of distributions allows for vendors to tailor their GNU/Linux distributions to particular tasks comparable to embedded systems, routers, and firewalls. take some time to cautiously examine the purchasable distributions, and verify which best fits your needs.
With that noted, two of those regular distributions stand out, however for diverse causes. purple Hat, since it has had probably the most name cognizance, and is constantly the first to get any variety of company support in the approach of business application or business technical service. Many companies, equivalent to Oracle, IBM, and investigate point, have released items for crimson Hat-selected distributions. This does not suggest that these application releases will not run on other GNU/Linux distributions, but when there's a problem, the supplier may now not help your installing of its product on a non-purple Hat distribution.
Debian is the second distribution that deserves mention. First, not because it is absolutely free, however since it is maintained via a nonprofit firm made up totally of volunteers. These volunteers are totally stimulated by quality and delight of their efforts to make Debian the most stable and absolutely a hundred% free distribution purchasable. Debian has confirmed to be extremely sturdy and simple to manipulate and upgrade remotely. The Boost process is by using far the easiest of any of the GNU/Linux distributions. Debian installations may also be upgraded without the want for reboots, changing each put in kit and running manner excepting the kernel. moreover, the Debian packaging equipment and its front ends enable extremely best-grained manage over which applications, utilities, libraries, and info exist for your equipment. Debian also is at present accessible on six distinctive architectures, with more than 3,900 included application applications to select from when setting up.
For both Debian and pink Hat installations, you should choose customized installations, and select the particular person programs you need on your device. There may still be no deserve to set up development packages, any of the brand new KDE or GNOME pcs, and certainly no longer X Window. sadly, neither distribution yet has a minimal cozy server or firewall predefined deploy-set.
all through the setting up method, be sure to decide to allow shadow password file assist; choose to use MD5 hashes for the passwords in preference to the general crypt feature. if you pass over these alternate options all over the installation, that you could trade them after installing. In crimson Hat, use the setup utility. In Debian, that you can use the shadowconfig utility to permit or disable shadow passwords. To enable MD5 hashes, you have to edit the acceptable information under /and so on/pam.d to consist of md5 on the password strains.
remember to additionally enable ipchains support, in spite of the fact that here's an software server on the DMZ. ipchains gives additional layers of security, and lets you deliver protection to the server from site visitors may still the firewall fail for some motive. A sample ipchains configuration is discussed later in the article.
remember to additionally read and computer screen the security and errata/updates lists out of your distribution seller. With Debian, it's extraordinarily effortless to automatically deploy security updates using the apt-get utility. For purple Hat installations starting with the 6.0 unencumber, there's the up2date utility to retrieve up-to-date programs on your free up.
For those individuals who choose to installation crimson Hat Linux, there is a safety-related assignment called Bastille Linux, whose purpose is not only to harden your Linux setting up, but to educate the directors on a way to harden the gadget. Bastille Linux helps purple Hat and Mandrake Linux distributions with undertaking dreams to turn into distribution, and UNIX taste, agnostic. The Bastille Linux product is a collection of scripts that asks a sequence of questions after which means that you can observe these changes to your system. The questions describe what needs to be accomplished, why it will be performed, and why you may no longer need to do it. It is awfully academic, primarily for these administrators just getting common with Linux. Bastille Linux may also be found at http://www.bastille-linux.org/.
another outstanding source of counsel for administrators is the Linux Administrator's security ebook. It covers a very big selection of issues concerning Linux and security. which you could find the Linux Administrator's safety guide online at http://www.securityportal.com/lasg/.Solaris-particular tasks
Solaris has 4 default deploy-units: Core, conclusion-consumer, Developer, and entire Distribution. setting up any deploy-set bigger than the Core installing will permit greater capabilities than are required for DMZ servers or firewalls. definitely, that you could frequently remove a big percent of the default Core deploy-set, counting on your server's utility requirements.
For Solaris-based servers, there are a couple of unbelievable documents from solar in its Blueprints on-line archive at http://www.sun.com/application/solutions/blueprints/online.html. here three papers are mind-blowing beginning facets for constructing cozy Solaris servers:
"Solaris operating environment Minimization for protection: a simple, Reproducible and relaxed software setting up Methodology" by way of Alex Noordergraaf and Keith Watson. besides the fact that children this paper specifically covers the iPlanet web server necessities, similar requirements are critical for the usage of Apache or other web servers.
"Solaris working ambiance security" by Alex Noordergraaf and Keith Watson. an outline of typical security options on a Solaris server. This paper contains some specifics for the SPARC architecture; although, lots of the material is applicable to Intel architectures as well.
"Solaris working atmosphere network Settings for safety" by way of Alex Noordergraaf and Keith Watson is another fantastic paper on kernel tuning and utility parameters that affect community safety.
As a rely of fact, solar's Blueprints on-line is a wealth of whitepapers outlining superior Practices related to Solaris working Environments, even if it's a DMZ net server, firewall, or inside extremely attainable database cluster.
Lance Spitzner also has an excellent Solaris hardening document that details the hardening technique for building a assess factor FireWall-1 firewall on a number of latest types of Solaris (via version 8) for the Intel and SPARC systems. The dwelling document resides at http://www.enteract.com/~lspitz/armoring.html.
finally, there's an comparable to the Bastille-Linux hardening scripts for Solaris referred to as TITAN. The TITAN project and documentation can also be discovered at http://www.fish.com/titan/.OpenBSD-certain projects
This section concentrates on OpenBSD 2.7, which is without doubt one of the three greater noted BSD variations; the others being NetBSD and FreeBSD. each and every variant has focused on a different difficulty: NetBSD is probably the most moveable, FreeBSD has the finest efficiency, and OpenBSD is the most comfy.
probably the most exquisite strengths of OpenBSD is the particularly cozy default stance of a default deploy of OpenBSD. The OpenBSD internet web page claims "three years and not using a far off hole in the default install, just one localhost gap in two years within the default set up." just about all capabilities are disabled until the administrator has enough journey to thoroughly configure them.
Two further alterations fundamental for an OpenBSD field to develop into a firewall are to disable sendmail and enable IP filter guide. each changes are made to the equal file, /and many others/rc.conf. To disable sendmail, changesendmail_flags="-q30m"
To enable IP filter aid, you need to exchangeipfilter=NO
moreover, if you might be doing network tackle Translation (NAT), offering clear proxying, or proposing aid for FTP, you ought to enable the ipnat choice by setting ipnat=sure. Syntax for IP filters may be covered in brief later within the chapter.
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Alfresco [1 Certification Exam(s) ]
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Amazon [7 Certification Exam(s) ]
American-College [2 Certification Exam(s) ]
Android [4 Certification Exam(s) ]
APA [1 Certification Exam(s) ]
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APICS [2 Certification Exam(s) ]
Apple [71 Certification Exam(s) ]
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ARM [1 Certification Exam(s) ]
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Autodesk [2 Certification Exam(s) ]
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Business-Objects [11 Certification Exam(s) ]
Business-Tests [4 Certification Exam(s) ]
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Certification-Board [10 Certification Exam(s) ]
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Citrix [48 Certification Exam(s) ]
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College-Board [2 Certification Exam(s) ]
CompTIA [79 Certification Exam(s) ]
ComputerAssociates [6 Certification Exam(s) ]
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F5-Networks [20 Certification Exam(s) ]
FCTC [2 Certification Exam(s) ]
Filemaker [9 Certification Exam(s) ]
Financial [36 Certification Exam(s) ]
Food [4 Certification Exam(s) ]
Fortinet [16 Certification Exam(s) ]
Foundry [6 Certification Exam(s) ]
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Google [5 Certification Exam(s) ]
GuidanceSoftware [2 Certification Exam(s) ]
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Medical [68 Certification Exam(s) ]
Microsoft [387 Certification Exam(s) ]
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Misc [1 Certification Exam(s) ]
Motorola [7 Certification Exam(s) ]
mySQL [4 Certification Exam(s) ]
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NetworkAppliance [39 Certification Exam(s) ]
NI [1 Certification Exam(s) ]
NIELIT [1 Certification Exam(s) ]
Nokia [6 Certification Exam(s) ]
Nortel [130 Certification Exam(s) ]
Novell [37 Certification Exam(s) ]
OMG [10 Certification Exam(s) ]
Oracle [299 Certification Exam(s) ]
P&C [2 Certification Exam(s) ]
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PayPal [1 Certification Exam(s) ]
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Polycom [2 Certification Exam(s) ]
PostgreSQL-CE [1 Certification Exam(s) ]
Prince2 [7 Certification Exam(s) ]
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PsychCorp [1 Certification Exam(s) ]
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QlikView [1 Certification Exam(s) ]
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See-Beyond [1 Certification Exam(s) ]
Siemens [1 Certification Exam(s) ]
Snia [7 Certification Exam(s) ]
SOA [15 Certification Exam(s) ]
Social-Work-Board [4 Certification Exam(s) ]
SpringSource [1 Certification Exam(s) ]
SUN [63 Certification Exam(s) ]
SUSE [1 Certification Exam(s) ]
Sybase [17 Certification Exam(s) ]
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Teacher-Certification [4 Certification Exam(s) ]
The-Open-Group [8 Certification Exam(s) ]
TIA [3 Certification Exam(s) ]
Tibco [18 Certification Exam(s) ]
Trainers [3 Certification Exam(s) ]
Trend [1 Certification Exam(s) ]
TruSecure [1 Certification Exam(s) ]
USMLE [1 Certification Exam(s) ]
VCE [7 Certification Exam(s) ]
Veeam [2 Certification Exam(s) ]
Veritas [33 Certification Exam(s) ]
Vmware [63 Certification Exam(s) ]
Wonderlic [2 Certification Exam(s) ]
Worldatwork [2 Certification Exam(s) ]
XML-Master [3 Certification Exam(s) ]
Zend [6 Certification Exam(s) ]
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