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650-472 S802dot1X - Introduction to 802.1X(R) Operations for Cisco Security Professionals

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650-472 exam Dumps Source : S802dot1X - Introduction to 802.1X(R) Operations for Cisco Security Professionals

Test Code : 650-472
Test cognomen : S802dot1X - Introduction to 802.1X(R) Operations for Cisco Security Professionals
Vendor cognomen : Cisco
: 69 true Questions

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S802dot1X - Introduction to 802.1X(R) Operations for Cisco Security Professionals

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Aruba Networks' CEO Hosts 2012 Analyst Day (Transcript) | killexams.com true questions and Pass4sure dumps

No result found, try recent keyword!The explosion of mobile devices to this -- initially by the introduction of their top platforms [indiscernible ... really the basis for my wired side configuration. If I wanted to 802.1x, if I want to d...

Embedded Security: the Next Big Thing in Wireless Devices? | killexams.com true questions and Pass4sure dumps

The wireless world is going to travel away from software-based security/encryption for a host of reasons, including processor speed, battery utilization, and remembrance scarcity. Embedded security in wireless networked devices is likely the "next Big thing" in wireless device security. Read on for a comprehensive explanation.

The adage that best describes the current situation of affairs with wireless devices and security is: "forecasting is always difficult, especially when it's about the future." To what degree will wireless LANs, PDAs, and next-generation 2.5G and 3G mobile handsets become fragment of the corporate IT landscape? I recently gave a speech on the growth of wireless devices and the attendant security needs at the RSA Security Conference in Paris. My presentation had about 100 attendees, every with varying views on how to meet this challenge.

All own that it's a matter of when, not if, they hold to deal with the challenge. The numbers discourse for themselves. According to a leading wireless market research consultancy, nearly 725 million wireless devices are expected to ship in 2003 (see pattern 1). Over 50% of these are expected to be mobile phones, followed by 20% PCs, and the remainder a mix of PDAs, wireless LANs, and broadband modems.

Most IT managers with whom I hold spoken are working out a map to fabricate these recent PDAs and wireless devices fragment of the networked ecosystem and thus more secure. The primary purpose of this article is to provide an overview of the current wireless security landscape with special attention given to the direction that many chip vendors such as Samsung, Intel, and Texas Instruments are taking with putting embedded intellectual property security "cores" into silicon. This increasingly considerable security methodology for wireless devices has wide-ranging implications, and users, IT executives and managers, and security architects should pay proximate attention.

What Can the Wireless Security Strategist and Implementer Do?The cost of implementing a tall flush of security on wireless devices quickly adds up. It can net out of control when you become matter on specialized security evolution staffs that understand every the variables of security methodologies, operating systems, hardware platforms, and the sheer volume of recent wireless software applications often tied to the service provider. Talk with any IT security professional, and you'll find out quickly that security is the separate most considerable enabling technology concerning the adoption and confidence of mobile applications.

Further, as the wireless carriers and service providers attempt to build a sustainable revenue model for high-profit data services, security-conscious wireless device users aren't going to buy a $20 hardcover bespeak from Amazon.com, let alone 100 shares of Microsoft from their wirelessly enabled brokerage account, unless they are assured that their device will enable a secure transaction. So what can the wireless security strategist and implementer do?

First, own that the wireless data is fragment of the entire networked data ecosystem (see pattern 2). Sure, the IT manager may not enjoy the thought that sales employees are bringing in their PDAs with their Bluetooth cards, or that the engineering department is using an impromptu 802.11a wireless LAN, or that the marketing department people are e-mailing digital photos taken from their recent mobile phones to the print studio, but that is the courageous recent world of wireless in the corporation.

In other words, don't stand in front of the wireless freight train, but manage what goes on the tracks and how it's used in your data network. Study the recent technologies, the alternatives, and the recent vendor offerings. For example, as the IEEE moves closer to resolution on the 802.11i yardstick (IEEE 802.11i is the yardstick for enhanced security of wireless LANs), pay proximate attention because the wireless LAN access point and card manufacturers and the various WLAN chip vendors such as Agere, Intersil, Texas Instruments, and Atheros invariably will ensue this yardstick in an trouble to supply standards-based products.

Within the IEEE, 802.1x is the authentication and authorization work done within the IEEE 802.1 working group, and it applies to every LAN technologies. It's besides considerable to cover briefly the various protocols that are being used as an adjunct to 802.1x for increased security.

EAP, the Extensible Authentication Protocol, has various iterations that functionally serve to reply the widely discussed issues with a WEP-only security solution. The Wired Equivalent Privacy key uses the 128-bit RC4 algorithm that has proven to be vulnerable to eavesdropping. As such, there are various proposals, such as "Protected EAP" or PEAP, an IETF proposal by Cisco Systems, Microsoft, and RSA Security, which builds tough authentication into a WLAN environment and claims to "plug in" to 802.1x.

There are besides variations of the transport layer security protocol called WTLS, which stands for Wireless Transport Layer Security. WTLS is similar in functionality to SSL, which is used to secure connections between your Web browser and a Web server. EAP-TLS is a fragment of Microsoft Windows XP and is based on the exercise of a user digital certificate and a server TLS certificate.

Cisco Systems' Lightweight Extensible Authentication Protocol, LEAP, is besides based on the 802.1x security standard. It is Cisco proprietary, in that it uses Cisco's RADIUS servers, but it is one solution that can be configured in Windows XP. There are other vendors that besides exercise RADIUS to provide a means to control MAC addresses that are allowed to exercise the wireless network. There is besides TKIP, the Temporal Key Integrity Protocol, which provides initialization vector hashing to animate preclude eavesdropping attacks. This is a pre-standard protocol and is considered a replacement to WEP. In addition to TKIP, AES is the other encryption yardstick proposed for 802.11i. There are several wireless device manufacturers that champion this.

Set Up a Corporate PolicySet up a corporate yardstick with an approved list of PDAs and wireless devices. It can be a relatively painless stint to assemble a quorum of the wireless user community in your company to contend their needs, determine which wireless devices and technologies are allowable, and establish a corporate wireless usage policy. Once there is a stated policy on approved wireless devices and usage, the next step falls into residence more easily: develop clear procedures and policies for remote usage.

For example, on the occasions that I access the corporate network from home, I connect my laptop using a wireless LAN PC Card, an 802.11b access point, and a router. I exercise the corporate VPN to tunnel into the network to access my e-mail and the Internet. There are many wireless managed service providers who are skilled in providing secure access services if this proves to be beyond the core offerings of your IT department.

Wireless Security Implementation ChoicesLet's snare a stare at two key areas of wireless security implementations. First, there is security in software. Then there is security in hardware, in the contour of embedded intellectual property in silicon.

Security in SoftwareAn implementation that is time-proven, standards-based, and widely used is an IPSec VPN client. Chances are honorable that you are already using a VPN client in your laptop or desktop computer; in fact, a VPN client is a yardstick offering in Windows XP. An IPSec VPN is a proven, robust, simple, cost-effective implement for secure communications. An IPSec VPN client offers a secure client-to-gateway communication over a wireless network at the network layer of the OSI model.

The key here is to exercise a product that is certified IPSec interoperable by the Internet Certification Standards Authority (ICSA) or the VPN Consortium (VPNC). IPSec-certified security, in addition to other wireless security protocols that I'll contend shortly, overcomes wireless security vulnerabilities. For example, you can hold a secure connection when using IPSec security software on your wireless LAN-enabled laptop and an IPSec VPN gateway behind the 802.11 wireless access point.

A few WLAN access point manufacturers are putting IPSec VPN gateway functionality in the box to serve both needs. The disclaimer here is that even though an IPSec VPN is a private, encrypted tunnel, the security is only as honorable as the authentication altenative you make. They hold every used passwords at one time or another, which is less than perfect.

The exercise of two-factor authentication, such as hardware tokens, requires users to present something they know, such as a password, and something they have, enjoy the hardware token. Digital certificates are a fast-growing contour of authentication as well. IPSec supports the exercise of industry-standard X.509 certificates as one authentication method. Although this introduces a digital certificate management system which can add complexity, it's worth the effort. Managed digital certificates exercise a unique key pair in the contour of one public key and one private key that the VPN client shares with the VPN gateway (server) to ensure the mobile devices' authenticity.

Security in SiliconEmbedded security in wireless networked devices is likely the "next Big thing" in wireless device security. Embedded security takes the cryptographic functions normally available in software and puts the intellectual property "security cores" into the silicon. Examples of some of these cores are encryption engines such as DES, 3DES, RC-4, and AES (see pattern 3). AES is the Advanced Encryption Standard, which is based on the Rijndael algorithm.

There are besides hash engines such as SHA-1 and MD5, and packet engines such as IPSec, SSL, and TLS. Another is the widely used True Random Number Generator. There is the associated software cryptographic library that can flee to optimize the algorithms embedded in silicon. recent PDAs and mobile handsets are already utilizing this recent technology.

Why the movement toward this hardware (silicon) based security paradigm? The two main reasons are performance and security. To achieve optimum performance, there is the drive to travel software applications away from robbing CPU horsepower on the device. Software-based cryptographic functions can consume anywhere from 30-80% of the CPU, thus robbing horsepower from other considerable applications. Software-based 3DES and SHA-1 can achieve only up to several Mbps of speed depending on the CPU.

Embedded hardware IP cores can scale from hundreds of Mbps to several Gbps. A public key "handshake" can snare up to one minute on slower CPUs used in many PDAs currently sold. This is why many silicon manufacturers hold selected to proceed the route of embedded IP in their next-generation wireless processors.

Embedded IP in silicon besides provides trusted algorithms. Software algorithms by definition can be compromised. Silicon-based embedded IP can besides provide key protection logic. Key protection logic is a fragment of secure remembrance in the silicon that only a trusted application can access. For instance, IPSec could be one of the trusted applications. One case is that chip manufacturers will allow only certain trusted applications to access keys stored in remembrance in the chip, a feature not achievable in a software-only security solution.

ConclusionIf this discussion has given some insight into the challenges faced by IT security professionals, and the strategies and solutions available, then I hold achieved my goal. By setting policies for wireless device users, educating the user on those policies, and setting up a secure network with a combination of standards-based IPSec VPNs and the various EAP protocols being used with 802.1x for additional security, you will attach the pieces in residence for a secure and trusted wireless network. And with an understanding of the next generation of wireless security based on silicon vendors using embedded IP security cores, you will know how to attach an efficacious wireless strategy in residence to meet the growing needs of the wireless user community.


Building Secure Wireless Networks | killexams.com true questions and Pass4sure dumps

While many paranoid system administrators and users quiet admiration any WLAN to be a gaping hole, these networks can be successfully secured against snooping and unauthorized access with a minute thought and effort. Fortunately for us, Linux provides some flexibility when it comes to choosing a wireless safeguard. While it's the ultimate wireless attacker's platform, it's besides the optimal system to confidence on when deploying a hardened WLAN. This is not surprising if you admiration that network storm and defense are two sides of the same coin.

This article describes the security issues facing the modern 802.11 networks and the solutions available to mitigate these problems using the Linux platform.

Main Security Problems The number one wireless security problem in the true world is the ignorance of the users and system administrators. They hold wardriven for several years in different parts of the world collecting statistics about every discovered WLANs. Unfortunately, the percent of completely open WLANs (roughly 70% of every found networks) quiet remains the same. It doesn't matter how honorable the industry-provided safeguards are; they're entirely useless if not turned on and properly configured, and that's what they contemplate on every corner of every street they pass by. Some of the open access points they saw were clearly Linux HostAP-based, so Linux users are not spared and can be just as security-ignorant as well. In fact, several types of ignorance fabricate WLANs an light prey for attackers on the streets or obnoxious neighbors:
  • Complete want of information of Layer 1/radio frequency operation. Not knowing how far the signal can spread from the intended coverage zone and how far away a prepared attacker can pick it up and ill-treat it is probably the main judgement for leaving every these completely unprotected WLANs around.
  • The want of understanding about Layer 2 wireless security - there are quiet people who believe that WEP, closed ESSIDs, and even MAC address filtering are sufficient to cease the attackers frosty (no, this is not a joke).
  • System administrators who are clueless about so-called "rogue" wireless devices being installed on their (not obviously wireless) networks by intractable users or even grave crackers using such appliances for out-of-bound backdoor access.
  • While everything mentioned above is related to the low flush of user education and network mismanagement, there are unfortunately a few purely technical problems related to 802.11 security. First of all, 802.11 management frames are quiet not authenticated. The 802.11 "I" stint group, assigned with improving wireless security, tried to implement certain 802.11 frames authentication but did not succeed. Thus, any 802.11 WLAN can be easily DoS'ed by flooding it with spoofed deauthentication or deassociation frames. Such floods are more than a mere nuisance since they can be used as an integral fragment of the man-in-the-middle and even gregarious engineering attacks. The only thing you can carry out is install wireless IDS that will detect the flood, spot the attacker physically, and scare them away.

    Second, the gear supporting the recently adopted 802.11i wireless security yardstick practically implemented by the Wireless Protected Access (WPA) Industry Certification quiet suffers from vendor interoperability problems, despite WPA version 1 being a fragment of the Wi-Fi Certification now. This presents a grave challenge for multivendor wireless networks, such as public tropical spots relying on users bringing their own cards. Finally, the 802.11i wireless security yardstick is actually more enjoy a set of standards, and some of these standards hold well-known weaknesses, e.g., want of mutual authentication in EAP-MD5. Besides, even when the yardstick design is solid, there are always nasty implementations that nullify the advantages it presents.

    Why and How Crackers Exploit WLANs Knowing your enemy is an absolute requirement of proper network protection, and penetration testing should always be your first line of defense. It's highly suggested that as a system administrator or wireless community guru you expend some time trying to exploit your own WLAN. If you are an IT security professional, it's always honorable to participate in ethical wardriving to contemplate what's really happening on the "wireless front lines" despite many "armchair expert" opinions. This is why they wrote Wi-Foo: The Secrets of Wireless Hacking. Since the final manuscript was submitted, nothing has changed when it comes to wireless attacker motivation and type. People quiet storm WLANs seeking fully anonymous access (no ISP logs) to cloak their tracks, looking for backdoor out-of-bound access to corporate networks (no egress filtering would animate and IDS sensors can be circumvented), and free bandwidth. However, a variety of recent public domain storm tools hold appeared, notably Hotspotter, aircrack, and wep_lab. These and many other tools can be found at their site (www.wi-foo.com), which probably has the largest categorized collection of wireless security-related open source tools and is updated on a regular basis.

    Hotspotter allows successful man-in-the-middle attacks against unpatched Windows boxes, exploiting a flaw in Windows Profiles. Even the WPA-protected networks are vulnerable.

    Aircrack optimizes cracking WEP, achieving a much higher efficiency than AirSnort, used casually for this task, and implements WEP'ed packets reinjection to accelerate WEP cracking in a route that's similar to OpenBSD Wnet's reinj tool. WEPPlus, a proprietary Proxim's solution to the FMS storm against WEP now replaced by TKIP in WPA-certified Proxim/Orinoco products, is besides vulnerable to aircrack's novel statistical attack. Wep_labs is another optimized WEP cracking implement and its latest version, posted to Packetstorm two days before this article was written, has been successfully ported to MS Windows. This puts the terminal nail into the coffin of WEP. Those quiet relying on it as the main WLAN defense measure should immediately switch to TKIP or higher-layer defenses. WEP cracking is now as light as it gets, and even a Netstumbler kiddie with XP Home Edition has a reasonable haphazard of getting your key.

    However, WPA version 1 is besides not without security problems. They hold mentioned the want of mutual authentication with EAP-MD5, the first EAP ilk to be employed by 802.1x that is quiet widely in use, since any 802.1x implementation would most likely champion it. Setting up HostAP plus accepting any authentication credentials on a Linux host and forcing the clients to associate with such a rogue AP is departed easy. Cisco EAP-LEAP is besides flawed or, better to say, the MS-CHAP it uses is. The storm against EAP-LEAP (implemented by Asleap-imp) was first unleashed by Joshua Wright at Defcon 11. Since then more tools that exercise it, such as THC-Leapcrack, were released. TKIP is vulnerable to offline dictionary attacks, at least in the SOHO preshared key (PSK) mode. A research paper describing these attacks in detail is available at http://wifinetnews.com/archives/002452.html. There is besides a lot of hype regarding the exercise of the WPA version 1 hash message authentication code (HMAC) implementation as a vector for DoS attacks. However, launching such attacks in practical terms has been far from light and they hold never encountered them in the true world. delight mention to Table 1 for a comparison of various wireless encryption schemes.

    Secure Wireless Networks Design and Deployment Using Linux Despite everything said above, WPAv1 (TKIP+802.1x+MIC hash or TKIP+PSK+MIC hash for SOHO mode) is far more secure than WEP, and WPAv2 (CCMP+802.1x+AES-based hash) is supposititious to be even harder to crack than WPAv1. Here we'll record how to implement these countermeasures to build a secure Linux wireless network that includes both Linux client hosts and Linux-based, custom-built access points. Many commercial access points, for example, those produced by Belkin and Netgear, are built on Linux anyway. They will extensively exercise HostAP, open source software that can be downloaded from http://hostap.epitest.fi, for running and securing Linux clients and access points. Another common implement related to securing wireless networks is Xsupplicant (www.open1x.org), which provides Linux client-side champion for the 802.1x port-based authentication standard. pattern 1 shows the 802.1x authentication mechanism. HostAP Jouni Malinen's HostAP is split into four parts: hostap-driver, hostapd, hostap-utils, and wpa-supplicant. The driver fragment is amenable for providing a elastic interface to the hardware and firmware functions of your wireless card. HostAP has initially been developed to champion Intersil Prism chipset cards, but has now been extended to champion other wireless chipsets such as Orinoco (alas, not in an Access Point mode). The hostapd daemon enables us to exercise a Prism chipset wireless card in Access Point mode (Master mode) with champion for IEEE 802.1x and dynamic WEP rekeying, RADIUS Accounting, RADIUS-based ACLs for IEEE 802.11 authentication, minimal IAPP (IEEE 802.11f), WPAv1, and IEEE 802.11i/RSN/WPAv2. HostAP utilities provide extended capabilities to your wireless interface and comprehend diagnostic and debugging utilities, firmware update tools, and various wireless scripting interfaces. The wpa-supplicant allows clients to utilize WLANs that champion WPA-PSK (SOHO) and WPA Enterprise authentication methods. hostapd Many people wish to exercise their Prism2 cards as a functional and secure access point. This stint is very light to accomplish with hostapd. Download and compile the latest version of hostapd and copy hostapd.conf and hostapd binary to your preferred location. Now you exigency to edit the hostapd.conf configuration file to specify the exact functionality of your Linux-based AP. The hostapd is very elastic and extensive; it allows you to control every aspect and security office of the AP. On multiple occasions we've found HostAP-based access points to be more stable and controllable than the industry-standard expensive APs. We'll briefly outline how to configure hostapd to champion 802.1x, WPA-PSK, and WPA Enterprise flush user/device authentication, and rekeying schemes. hostapd and 802.1x Authentication If your gear is outdated or an implementation of WPA is not feasible for your organization for some bizarre reason, frequent 802.1x-based WEP key rotation is one of the few choices left to secure your WLAN. To champion dynamic WEP rekeying using hostapd, you should hold the following configuration options enabled in hostapd.conf:

    ssid=Arhont-xmacaddr_acl=1accept_mac_file=/etc/hostapd.acceptdeny_mac_file=/etc/hostapd.denyieee8021x=1wep_key_len_broadcast=13wep_key_len_unicast=13wep_rekey_period=900own_ip_addr=192.168.111.22nas_identifier=hostap.arhont.comauth_server_addr=192.168.111.101auth_server_port=1812auth_server_shared_secret=Very-Secret_KEYacct_server_addr=192.168.111.101acct_server_port=1813acct_server_shared_secret=Very-Secret_KEY

    Adjust the following settings of your specific network setup: ssid, own_ip_addr, nas_identifier, auth_server_addr, auth_server_shared_ secret, acct_server_addr, and acct_server_shared_secret. The next step is to create /etc/hostapd.accept and /etc/hostapd.deny files, which will hold a list of MAC addresses of wireless cards that are allowed to connect to your AP. Once the configuration files are ready, launch hostapd in the following manner:

    hostapd /etc/hostapd.conf

    where /etc/hostapd.conf is the location of the hostapd configuration file. Don't forget that you'll besides exigency a working RADIUS server. The FreeRADIUS server is an excellent open source solution. You can download it from www.freeradius.org. Check out the freeradius mailing list and FAQ if you hold any difficulties with the RADIUS implementation.

    hostapd and WPA-PSK WPA-PSK is a replacement for static WEP on SOHO environment networks. To achieve WPA authentication using the Pre-Shared Key authentication, enable the following options in the hostapd.conf file:

    ssid=Arhont-Xmacaddr_acl=1accept_mac_file=/etc/hostapd.acceptdeny_mac_file=/etc/hostapd.denyauth_algs=1own_ip_addr=192.168.111.22wpa=1wpa_passphrase=secret-password-blahwpa_key_mgmt=WPA-PSKwpa_pairwise=TKIP CCMP

    As with the previous example, adjust the settings to represent your network requirements. Unlike 802.1x and WPA Enterprise authentication means, with WPA-PSK there is no exigency to specify RADIUS server details. Once the configuration files are ready to be deployed, flee hostapd the same route you would with the 802.1x setup.

    Congratulations, you now hold a working hostapd with WPA-PSK support. However, don't forget to select a very tough PSK, taking into account its vulnerability to bruteforcing.

    hostapd and WPA Enterprise To enable the enterprise grade WLAN encryption, admiration using WPA-EAP authentication. The following settings in hostapd.conf are required to enable this mode:

    ssid=Arhont-xmacaddr_acl=1accept_mac_file=/etc/hostapd.acceptdeny_mac_file=/etc/hostapd.denyieee8021x=1own_ip_addr=192.168.111.22nas_identifier=hostap.arhont.comauth_server_addr=192.168.111.101auth_server_port=1812auth_server_shared_secret=Very-Secret_KEYacct_server_addr=192.168.111.101acct_server_port=1813acct_server_shared_secret=Very-Secret_KEYwpa=1wpa_key_mgmt=WPA-EAPwpa_pairwise=TKIP CCMPwpa_group_rekey=300wpa_gmk_rekey=6400

    As with dynamic WEP using 802.1x, WPA-EAP requires the exercise of a RADIUS server to authenticate mobile users. Once the hostapd is restarted, to snare result of the modified hostapd.conf file you should hold a perfectly working Linux AP with WPA-EAP authentication means.

    wpa_supplicant We've dealt with the server side of setting up a Linux AP with various authentication schemes; now it's time to contend a secure setup for the client side. Once the wpa-supplicant is downloaded (http://hostap.epitest.fi) and compiled (refer to the README file on how to create a .config file and compile the tool), you should edit the wpa_supplicant.conf configuration file. The default version of this file has already been provided for your convenience with a description of every the necessary fields that you might exigency to enable in order to participate in the WPA-protected WLAN. For instance, to hold client-side champion for the WLAN that authenticates its clients against the RADIUS server with EAP-TLS support, the following should be enabled: network={ ssid="Arhont-w" proto=WPA key_mgmt=WPA-EAP pairwise=CCMP TKIP group=CCMP TKIP eap=TLS identity="[email protected]" ca_cert="/etc/ssl/certs/cacert.pem" client_cert="/etc/ssl/certs/client-cert.pem" private_key="/etc/ssl/certs/client-priv.pem" private_key_passwd="client-secret-password" priority=1 }

    In case you don't exigency the WPA enterprise-level authentication and you simply want to enable the WPA-PSK support, the following setup should be reflected in the wpa_supplicant.conf file:

    network={ ssid="Arhont-w" psk="very underhand PSK passphrase" priority=5 }

    Once the configuration file is ready, you can launch the wpa-supplicant utility to associate and authenticate to the desired wireless network. It can be done the following way:

    wpa_supplicant -i wlan0 -c/etc/wpa_supplicant.conf -D hostap -B

    This should flee wpa_supplicant in daemon mode using the hostap driver on a wlan0 interface with a configuration file located in /etc/wpa_supplicant.conf. You should net the following output from the iwconfig and iwlist commands once authentication is successful.

    wlan0 IEEE 802.11b ESSID:"Arhont-w" Mode:Managed Frequency:2.462GHz Access Point: 00:XX:XX:XX:XX:XX Bit Rate:11Mb/s Tx-Power:50 dBm Sensitivity=0/3 Retry:off RTS thr:off Fragment thr:off Encryption key:61CC-3D80-78CF-33D4-294F-B24F-C7C6-C6B8 Security mode:restricted Power Management:off Link Quality=26/94 Signal level=-69 dBm uproar level=-95 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx extreme retries:0 Invalid misc:0 Missed beacon:0 ath0 3 key sizes : 40, 104, 128bits 4 keys available : [1]: E619-D524-557B-21A3-7B48-6E26-DB68-2272 (128 bits) [2]: 006E-D5E5-6EBC-F41B-A9EC-8906-74E6-DA7D (128 bits) [3]: off [4]: off Current Transmit Key: [1] Security mode:restricted Xsupplicant In a route the configuration of xsupplicant is quite similar to wpa-supplicant. To fabricate the setup work, you'll exigency an AP with 802.1x support, a RADIUS server, and a set of certificates. The clients should download and compile the xsupplicant implement and edit the xsupplicant.conf file that has various configuration options to be implemented by xsupplicant. Unfortunately, the scope of this article doesn't allow us to proceed into the details of configuring and debugging 802.1x authentication schematics. More information on this topic can be easily Googled. If you prefer a hard copy of systematic reading material, their bespeak Wi-Foo: The Secrets of Wireless Hacking is a hands-on steer to wireless security and hacking.

    Once the configuration of xsupplicant is ready and configured for your WLAN, issue the following command to authenticate and net the per-session-based dynamic WEP key.

    xsupplicant -i ath0 -c /etc/xsupplicant.conf

    If every goes well, you should hold a similar output to iwconfig command:

    ath0 IEEE 802.11g ESSID:"Arhont-x" Mode:Managed Frequency:2.462GHz Access Point: 00:XX:XX:XX:XX:XX Bit Rate:36Mb/s Tx-Power:50 dBm Sensitivity=0/3 Retry:off RTS thr:off Fragment thr:off Encryption key:A3D0-FF7F-AD85-E6AB-1808-38A8-90 Security mode:restricted Power Management:off Link Quality=28/94 Signal level=-67 dBm uproar level=-95 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx extreme retries:0 Invalid misc:0 Missed beacon:0

    As you can see, the xsupplicant successfully authenticated to AP with 802.1x champion and received a pair of keys that is used to encrypt the unicast and broadcast traffic. By issuing the iwlist wlan0 key command you can net the list of keys that has been assigned to you by the AP.

    ath0 3 key sizes : 40, 104, 128bits 4 keys available : [1]: A3D0-FF7F-AD85-E6AB-1808-38A8-90 (104 bits) [2]: CCD1-7D97-A2D3-9B4A-CAA1-DE7E-A6 (104 bits) [3]: off [4]: off Current Transmit Key: [1] Security mode:restricted

    You can control reauthentication and rekeying time intervals from an access point side. If WEP and not TKIP or CCMP is used, they imply rotating the key every five minutes.

    Wireless Intrusion Detection (wIDS), Higher Layer Defenses, and Secure Wireless Gateways Apart from implementing 802.11i-based countermeasures, there are more things you can carry out to secure your Linux-based wireless network. One is detecting attacks against your WLAN. This can be done by adding another wireless PCMCIA or PCI card to your Linux-based access point or building a specialized wIDS box, perhaps using a Soekris board (www.soekris.com) or a Linux PDA. This card will hold to sojourn in the RFMON mode with a selected wIDS implement (or set of tools) running to dissect the traffic it picks. The defense fragment at www.wi-foo.com lists the currently available open source wIDS tools. Most of them are signature-based and light and straightforward to configure. However, probably the best option for implementing now is to exercise Kismet to monitor your WLAN. Kismet detects an extensive list of suspicious wireless events, including Netstumbler kids and floods with various 802.11 management frames. It will besides demonstrate you rogue access points and other WLANs in the area, as well as certain types of non-802.11 traffic using the same frequency purview with Wi-Fi LANs.

    When a suspicious event is detected, a siren sounds and information about the event flashes at the bottom of the screen. To contemplate the info about recent suspicious events on your WLAN in a divorce ncurses panel, press "w". If you're deploying a great WLAN, you can gain a Great odds from Kismet's client/server structure, with multiple clients installed along the network reporting the events to a centralized server.

    On the server side, you can easily integrate Kismet with Snort, providing intrusion detection on every network layers. Open kismet.conf file, scroll toward the #fifo=/tmp/kismet_dump, uncomment this line, redeem the configuration file, and start kismet_server. Once started, Kismet will lock the /tmp/kismet_dump file until it's picked up by Snort. Now, let's start Snort. Configure it to your liking, but add an additional -r /tmp/kismet_dump switch when you flee it, so it will read data from the FIFO feed of Kismet. You can further install and flee ACID for pleasant and colorful IDS log viewing.

    Another thing to admiration is deploying higher-layer defenses instead of or with 802.11i (if the security requirements of the network are tall or you're truly paranoid). Imagine a long-range point-to-point wireless link. Using IPSec as implemented by Linux OpenSwan or KAME suites to secure such a link provides more flexibility than using WPA, since you hold a Great altenative of (symmetric, assymmetric, and hash) ciphers and IPSec modes. You won't exigency the RADIUS server for the link a la WPA Enterprise and will achieve a higher flush of security than provided by WPA SOHO.

    Make confident that the IPSec key distribution over such a link is mutually authenticated (Diffie-Hellman) to avoid crackerjack-style wireless man-in-the-middle attacks. If you admiration IPSec too difficult to exercise or unnecessary, modern Linux PPTP with MPPE implementations are reasonably secure. Of course, in such cases you are limited to 128-bit RC4 and static PSK to encrypt wireless data.

    If you want to connect a limited resources device such as a Linux PDA or mobile phone without 802.11i/WPA support, SSH port forwarding can be an arrogate and light altenative that is highly interoperable and does not attach a great burden on the available device resources. fabricate confident that SSHv2 is running and there are no vulnerabilities in the sshd daemons used, since anyone can try to launch an storm against your link and daemons. There are many extensive sources that record the practical exercise of IPSec, PPTP, and other VPN protocols such as cIPE and SSH port forwarding on Linux so we're not going to compete with them here.

    Finally, it makes sense to divorce your wireless and wired networks with a secure gateway. 802.11 Security by Bruce Potter and Bob Fleck (O'Reilly) goes to Great lengths explaining how to build such gateways using stateful filtering and port/protocol forwarding with Linux Netfilter. The gateway must be as hardened as it can get: they strongly imply using security-oriented distros such as Astaro or Immunix and implementing kernel-level security (OpenWall, Grsecurity, St Jude, etc.) alongside the yardstick Linux-hardening practices. Due to the flexibility of the OS, such a gateway can besides serve as an 802.11i-secured access point, wireless traffic load-balancer, wIDS/IDS sensor, VPN concentrator, and RADIUS server. Combine every these properties in a commercial, proprietary, closed-source solution and you'll net a $100,000 product. With Linux, the opportunities are there and are only limited by your imagination, desire, and time.



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