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Test Number : 250-253
Test appellation : Administration of Veritas Cluster Server(R) 6.0 for Unix
Vendor appellation : Symantec
: 235 Dumps Questions

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Administration of Veritas Cluster Server(R) 6.0 for Unix education

enforcing security, allotment II: Hardening Your UNIX/Linux Servers | 250-253 Dumps and actual test Questions with VCE practice Test

continuing with allotment 2 of this two-article collection, Joseph Dries helps you proceed to expand upon your list of basic safety approaches by using taking a stare 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 bespeak to commercial enterprise Internetworking and security.

"A industrial, and in some respects a social, doubt has been began in the final year or two, no matter if or now not it's commandeer 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 supposititious safeguard of locks presents a top rate for dishonesty, by showing others how to be dishonest. here's a fallacy. Rogues are very avid of their occupation, and already understand lots more than they will drill them respecting their a few forms of roguery. Rogues knew a superb deal about lockpicking long before locksmiths discussed it amongst themselves, as they maintain got currently executed. If a lock—let it maintain 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 deceitful are tolerably inevitable to be the first to apply the expertise nearly; and the spread of potential is integral to deliver unprejudiced play to people that may endure with the aid of want of know-how. It cannot be too earnestly advised, that an acquaintance with actual facts will, within the conclusion, be greater for outright parties." —Charles Tomlinson's "Rudimentary Treatise on the progress 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 comprehend HP-UX and Solaris (SunOS 5). other UNIX programs, similar to AIX, provide commands as a course to act BSD-ish or device V-ish, depending on how they maintain 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 consume the GNU materiel (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 report the course to acclimatize a UNIX/Linux server. This subsequent section offers some regular procedures that will moreover 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 retract into a more designated account of the course to acclimatize a server for a selected task.

ordinary Steps for Hardening UNIX/Linux Servers

The process of constructing a UNIX or GNU/Linux server for consume 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 regular 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 divide partitions for the glaring, corresponding to SWAP and /tmp, form certain to deliver protection to towards out-of-disk-area denial-of-service assaults. Intruders may are attempting to create inordinate technology of logging data or fill your file system with colossal info through FTP or mail spool. The top of the line course to deliver protection to in opposition t here's to section the filesystem hierarchy into divide actual partitions.

the root partition / can be wee 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 emblem 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 comprehend information or configuration files that alternate; for this reason, an delivered security measure will moreover 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 form /var/spool/mail, or /var/mail in Solaris, a divide partition, or—even greater—a divide disk array. in case you handiest create one divide partition from /, /var is the one bethink 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 consume those directories, they too will moreover be hooked up as examine-simplest.

These are information and guidelines handiest, and are different from suggested settings for a materiel 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 trial and substances required for systems.

There are a number of functions enabled via inetd, and just about outright 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 appellation services daemon. except for your DNS servers, be certain to not be running DNS in your firewall or DMZ servers.

  • in.fingerd—Finger daemon that may moreover be used to array 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 array 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 invoke replay assaults.

  • time—Connections to this provider revert the time as a 32-bit cost representing the variety of seconds considering hour of darkness 1-Jan-1900. attain 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 reflect (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 outright techniques and their popularity.

  • netstat—Connections to this provider supply a listing of latest network connections and their popularity.

  • deploy and Configure tcp_wrappers

    set up and configure Wietse Venema's tcp_wrappers on both your firewall and DMZ servers. tcp_wrappers allows you to define access ply 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 reply is to avoid unique 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 outright assistance safety breaches, intentional or accidental, ensue internally. it be handiest the external defacements, vast 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 fine nuclear information.

    tcp_wrappers maintain two leading files that permit access to the for my allotment 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 silent be taken when using the common or UNKNOWN wildcards. outright will at outright 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 set aside in and configured with the aid of default on most GNU/Linux distributions and BSD releases. For these UNIX techniques that won't maintain tcp_wrappers set aside in by course of default, they can moreover 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 appellation Daemon, or BIND, is the reference implementation of the appellation 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 efficacious very ancient versions of UNIX programs and GNU/Linux distributions came with BIND four. still, you'll be surprised how many installations nevertheless maintain the older BIND four operating. be certain 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 inevitable to be some hand editing.

    BIND 8 is the present sturdy 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, plenary Dynamic DNS, incremental zone transfers, discrete views (internal, exterior, etc) from a unique server, and scalability improvements. If any of those points are essential to your configuration, form certain you investigate the usage of BIND 9; otherwise, it's top-quality left to the adventurous.

    although just about outright UNIX programs and GNU/Linux distributions Come with BIND as the appellation server, it's critical you be certain you're at a suggested liberate. earlier than deploying a DNS server, internally or on the DMZ, form certain it's at least edition eight.2.2-P5. Any edition prior to that has critical exploits. This warning may silent no longer be omitted. The information superhighway software Consortium themselves maintain issued a statement that if you're running any edition of BIND ahead of 8.2.2-P5, you should definitely matter on your server has already been compromised. verify your UNIX materiel or GNU/Linux distribution. If the edition of BIND is not at the least 8.2.2-P5, debate 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 moreover 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 silhouette an entry control record composed of blocks of addresses for consume with a named identifier. the usage of ACLs provides a self-documenting formulation of administrating the named.conf configuration file. In here instance, they silhouette two ACLs comprising their externally seen DNS servers and the secondary servers at their ISP:

    acl your-enterprise-dns 172.16.30.12; 172.sixteen.30.24; ; acl your-ISP-dns 199.177.202.10; 204.95.224.200; ;

    here allow-transfer alternative directive placed to your named.conf file will default outright 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 election will preclude zone transfers to hosts now not specified within the ACLs. despite the fact, in case you want to avert outright zone transfers on your secondary servers and any secondary zones for your primary servers, consume predefined match list none. This can moreover 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 ply 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 efficacious 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 set aside 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 gratify form inevitable 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, consume privilege 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 form sendmail maintain a extra secure stance:

  • authwarnings—Add X-Authentication-Warning header in messages on determined situations that may point out mail materiel 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 consume 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 dawn fame Notification (DSNs) of birth and read receipts.

  • goaway—Set outright 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.

  • more desirable than sendmail: Making Postfix Your MTA

    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 unique executable fancy sendmail; quite, Postfix includes a collection of specialized classes that role specific projects. outright of the classes apart from the master manage process (oddly known as master since it runs without root privilege) sprint 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 attain not dream in sendmail.cf syntax, Postfix will form 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 matter number of setting up it by the consume of your materiel administration system, or (in the BSD case) via the ports collection.

    when you are using an working gadget that does not distribute Postfix, despondency now not. that you would be able to download and compile the sources with ease on a progress laptop after which installation the binaries in your mail server. The sources, FAQs, and documentation can moreover 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 carry weight in particular that bethink to consume 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. purchase 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 appellation cognizance, and is constantly the first to collect any variety of company advocate in the approach of commerce application or commerce technical service. Many companies, equivalent to Oracle, IBM, and investigate point, maintain released items for crimson Hat-selected distributions. This does not intimate that these application releases will not sprint on other GNU/Linux distributions, but when there's a problem, the supplier may now not advocate 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 hard made up totally of volunteers. These volunteers are totally stimulated by character and delight of their efforts to form Debian the most stable and absolutely a hundred% free distribution purchasable. Debian has confirmed to be extremely sturdy and simple to maneuver and upgrade remotely. The Boost process is by using far the easiest of any of the GNU/Linux distributions. Debian installations may moreover be upgraded without the want for reboots, changing each set aside in kit and running manner excepting the kernel. moreover, the Debian packaging materiel and its front ends enable extremely best-grained manage over which applications, utilities, libraries, and info exist for your equipment. Debian moreover 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 necessity on your device. There may silent be no deserve to set up progress 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 certain to settle to allow shadow password file assist; choose to consume MD5 hashes for the passwords in preference to the common crypt feature. if you pass over these alternate options outright over the installation, that you could trade them after installing. In crimson Hat, consume the setup utility. In Debian, that you can consume the shadowconfig utility to permit or disable shadow passwords. To enable MD5 hashes, you maintain 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 silent 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 acclimatize your Linux setting up, but to educate the directors on a course to acclimatize the gadget. Bastille Linux helps purple Hat and Mandrake Linux distributions with undertaking dreams to spin 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 keep these changes to your system. The questions report what needs to be accomplished, why it will be performed, and why you may no longer necessity to attain it. It is awfully academic, primarily for these administrators just getting common with Linux. Bastille Linux may moreover 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 vast 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 vast 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 dawn facets for constructing cozy Solaris servers:

  • "Solaris operating environment Minimization for protection: a simple, Reproducible and relaxed software setting up Methodology" by course 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 silhouette 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 course of Alex Noordergraaf and Keith Watson is another grotesque paper on kernel tuning and utility parameters that affect community safety.

  • As a confidence 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 moreover has an excellent Solaris hardening document that details the hardening technique for edifice 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 moreover 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 pocket in the default install, just one localhost gap in two years within the default set up." just about outright capabilities are disabled until the administrator has enough journey to thoroughly configure them.

    Two further alterations fundamental for an OpenBSD territory 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, change

    sendmail_flags="-q30m"

    to

    sendmail_flags=NO

    To enable IP filter aid, you necessity to exchange

    ipfilter=NO

    to

    ipfilter=yes

    moreover, if you might be doing network tackle Translation (NAT), offering pellucid proxying, or proposing aid for FTP, you ought to enable the ipnat election by setting ipnat=sure. Syntax for IP filters may be covered in brief later within the chapter.


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