wireless radius access susan mulholland joseph paulowskey joseph woulfe
TRANSCRIPT
Wireless RADIUS Access
Susan Mulholland
Joseph Paulowskey
Joseph Woulfe
What is a Wi-Fi?
Stands for Wireless Fidelity The wireless networking and networking
is called 802.11 Can connect PC’s, notebooks, and PDAs
to enable them to share internet connections, printers and documents
Can be up to 300 feet
Three kinds of 802.11
802.11b The first version of 802.11b Slowest Least expensive
802.11a The second version Can handle up to 54 mega bits per second Operates at 5 GHz
802.11g The third version Operates at 2.4 GHz Has advantage of higher speeds
Advantages of Wi-Fi
Allows LANs to be deployed without cabling Reduce the costs of network deployment and
expansion. Can host wireless LANs. Networks support roaming Wi-Fi client works in all different countries A global set of standards
Disadvantages of Wi-Fi
Power consumption is high Concerns about battery life and heat Has limited range. Access points could be used to steal personal
information transmitted from Wi-Fi users. Wired Equivalent Privacy or WEP is easy to be
breakable even when correctly configured. WPA2 Wired Protected Access is improved and better than WEP.
Wi-Fi Security
If a hotspot is open, then anyone with a Wi-Fi card can access the hotspot. The original standard was 64-bit encryption that was easily broken.
If it is secure using 128-bit encryption, then the user needs to know a WEP key to connect. Using a hotspot at your house, you need a WEP 128-bit encryption preventing intruders into your network.
Wi-Fi network in your home
802.11b Is slightly less expensive and the slowest of the three
802.11. For home use, 802.11g costs just a little more, but is up to 5 times faster. If you will be doing a lot of file transfers between computers in your home, 802.11g is definitely the way to go.
802.11g Costs just a little more, Up to 5 times faster. If you do a lot of file transfers
between computers in your home, then 802.11g is the best the way to go.
Two kinds of Wi-Fi
Commerical Wi-Fi Services are available such as Internet cafes, Borders
bookstore, and more. T-Mobile has many hotspots in all Borders and Starbucks.
Free Wi-Fi Many members of local governments have joined with
local community groups to help expand free Wi-Fi networks. Some community groups built their Wi-Fi networks based on volunteer efforts and donations.
About Wi-Fi revolution
Consultants from Pyramid Research predicted that more Americans would use Wi-Fi than cellular networks by 2007.
Last year, approximately 30.2 million Americans used Wi-Fi, according to Pyramid comparing with 213 million mobile-phone customers.
Demand for Wi-Fi is increasing. However, the pace shows signs of slowdown.
RADIUS
Stands for: Remote Dial In User Service The Certificates are used to authenticate
the user’s computer and to authenticate the RADIUS server.
Deployment Diagram This diagram shows how the user’s
wireless device will connect through the wireless access point. The credentials will then be sent from the access point to the radius server which will verify the user information using the Network Information Service (NIS) server. Upon verification in the NIS server the user acceptance will be passed back up to the RADIUS server then back up to the access point which will put the user back on the network. The user will then be allowed to do a DHCP request for an IP address and the DHCP server will respond.
Architectural Design
Radiusd.conf
The radiusd.conf file is the main configuration file for the FreeRadius Server
radiusd.conf file.• Port =1812 #sets the port to listen on to
1812
• Log_auth = yes #sets the server to log authentication requests
Clients.conf The clients.conf file is a configuration file for the FreeRadius server
that establishes what clients can connect to the radius server.
The following are the lines that were modified in the client.conf file to allow for the single test access point to be a client as well as the local host to be a client for testing.
• client [134.198.161.212]{secret = cmps354shortname = WAP354}
• client localhost{secret = cmps354shortname = lh}
Eap.conf The eap.conf file is a file that handles the configuration for the EAP
protocols in FreeRadius. The following lines have to be adjusted.
• default_eap_type = tls #tls is the authentication form that is being used• #The following is from the tls module• private_key_password = • private_key_file = ${raddbdir}/certs/serverkey_cert.pem• certificate_file = ${raddbdir}/certs/serverkey_cert.pem• CA_file = /usr/local/openssl/cmpsCA/cacert.pem• dhfile = /dev/null #link to a built in null location• random_file = /dev/urandom #link to a built in random number generator• #The following is from the ttls module• #default_eap_type = • copy_request_to_tunnel = yes• use_tunnled_reply = yes
Installing OpenSSL
OpenSSL by default is installed onto the FreeBSD 5.4 system
After installing OpenSSL the administrator has to go to the directory that contains the configuration files for OpenSSL.
By default on FreeBSD the path is /usr/local/openssl/.
From there you can find the file openssl.cnf this file has a number of lines that should be edited for ease of use.
openssl.cnf
lines that should be edited for ease of use.
# These are some of the lines that should be modified• [ CA_default ]
dir = ./cmpsCA # Where the CA is kept#further downcountryName_default = US stateOrProvinceName_default =Pennsylvania 0.organizationName_default = Computing Science Department
xpextensions
After editing the defaults of the openssl.cnf file another file must be created because these certificates are going to be used on Microsoft Windows XP computers.
The file should be created and named xpextensions.
xpextensions
The following lines should be added to xpextensions:• [ xpclient_ext]extendedKeyUsage =
1.3.6.1.5.5.7.3.2
• [ xpserver_ext ]extendedKeyUsage = 1.3.6.1.5.5.7.3.1
Creating a Certificate Authority
To create a certificate authority you must edit the CA.sh file in the openssl/misc directory • CATOP=./cmpsCA #this path should match
the dir specified in #openssl.cnf
Creating and Signing Certificates
The first step for creating the server certificates is to make a certificate request with this command:• $ openssl req -new -nodes -keyout server_key.pem -out
server_req.pem -days 730 -config ./openssl.cnf After making the request it will prompt the user to enter
some organization information then the request will be created under the file server_req.pem
This server request now has to be signed by your created certificate authority and the xpextensions needs to be added to the certificate. This can be done with the command:• $ openssl ca -config ./openssl.cnf \-policy policy_anything -
out server_cert.pem \-extensions xpserver_ext -extfile ./xpextensions \-infiles ./server_req.pem
Creating and Signing Certificates
client_req.pem The client certificate follows the same process
as the server certificate First you must create a signing request.
• $ openssl req -new -keyout client_key.pem \ -out client_req.pem -days 730 -config ./openssl.cnf
Then you sign the request with the same certificate authority • $ openssl ca -config ./openssl.cnf \-policy
policy_anything -out client_cert.pem \-extensions xpclient_ext -extfile ./xpextensions \-infiles ./client_req.pem
Creating and Signing Certificates
Finally after you have created your signed certificate in the client_cert.pem you have to convert it to a .p12 file for windows machines.
You can do that with this command openssl pkcs12 -export -in client_cert.pem \-inkey client_key.pem -out client_cert.p12 -clcerts
Wireless Access Points
The Wireless Access points need to be configured for the network
Set static IP IP address should be reflected in the
clients.conf file of the radius directory The SSID needs to be modified to
“CMPS”
Wireless Access Points
User Interface Design
SecureW2 Supplicant The SecureW2 client is a WPA
supplicant that installs onto the users Windows XP computer.
This is used to authenticate the user through the RADIUS server using the TTLS protocol.
SecureW2 Installation
The SecureW2 client can be downloaded from
http://www.securew2.com/uk/download/index.htm
SecureW2 Installation
SecureW2 Installation
Configuration
SecureW2 allows for PAP authentication SecureW2 also allows you to input a
user id and password combination for quick reconnecting to the network
This can be used on a personal computer
The configuration of the SecureW2 Client is shown below
Resources
http://en.wikipedia.org/wiki/WiFi http://www.wi-fihotspotlist.com/ http://www.wififreespot.com/pa.html http://www.wifimaps.com/ http://www.cs.scranton.edu/%7Etjm2f/
school/cmps490/SystemDocumentation.doc#_Toc121278389