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admin | Category: Phone Lookup Free | 16.09.2015
Ben Rogers is a Staff Software Engineer for the IBM zSeries and System z9 Client Technology Center (CTC), where he specializes in enterprise security with a focus on RACF, LDAP, and WebSphere security.
IntroductionThe issue of user ID and password proliferation, coupled with the ever increasing number of applications with which end users must interact, has become a critical issue for many IT shops.
Ksetup.exeBefore beginning, map out the names of the systems that will be involved in this solution. RDEFINE APPL SKRBKDC UACC(READ)The PTKTDATA class is also required by Kerberos when using a RACF back end. KEY ENCRYPTION TYPE= DES NODES3 NODESDCreate the realm definitionSince the KDC is using RACF as a back end, you must create a REALM definition within RACF. The first time you sign in to developerWorks, a profile is created for you, so you need to choose a display name. Keep up with the best and latest technical info to help you tackle your development challenges. This is a place devoted to giving you deeper insight into the news, trends, people and technology behind Bing. Instead of using command-line tools supplied by your operating system, you can use one of the many web-based reverse DNS lookup tools. On Windows systems, you can use nslookup from the command prompt (using cmd.exe) for the both the reverse and forward DNS lookup.
The verdict is the same: the name and the address match, so this is a verified Bing crawler. For example, if you are experiencing an increase in HTTP 403 Forbidden responses to valid Bingbot requests, your webserver may have been configured to allow Bingbot access based on such a list. To this end, many organizations have turned to Kerberos technology; the underlying philosophy of Kerberos is that machines trust other machines through a third party Kerberos Key Distribution Center (KDC). If AD and the domain name server (DNS) are not already set up, you can use the Window dcpromo.exe command to install and configure AD and DNS.
Enter Zone nameSelect Do not allow dynamic updates and click Next.Validate the information you have entered is correct and select Finish.
Verify new zone informationYou will now see a folder under Forward Lookup Zone that corresponds to the zone (domain) of the System z server (Figure 12). Select resource record typeThis record name is _kerberos and the Text of this record must be the full System z realm name.
Enter values for the TCP service location recordNext, you will create the _kerberos UDP service. Enter values for the UDP service location record Create the _kpasswd TCP service by selecting _kpasswd for Service and _tcp for Protocol.


Enter values for the TCP service location record Finally, create the _kpasswd UDP service by selecting _kpasswd for Service and _udp for Protocol.
Enter values for the UDP service location recordNow, all services have been defined to the Windows DNS. Check text entriesNext, check the TCP service records and make sure both a _kerberos and _kpasswd service location record exist for this entry, and that they point to the System z server hosting this service.
Check TCP service location recordsNext, check the UDP service records and make sure both a _kerberos and _kpasswd service location record exist for this entry, and that they point to the System z server hosting this service. Specify network ID valuesSelect Do not allow dynamic updates, then Next.Verify the information, then click Finish. Verify new zone informationNext, create a new pointer record for the reverse lookup zone you just created.
This preference lists the sites that are permitted to engage in SPNEGO authentication with the browser. Your display name must be unique in the developerWorks community and should not be your email address for privacy reasons. It is important to note that like other search engines, Bing does not publish a list of IP addresses or ranges from which we crawl the Internet. Always keep an eye on your Message center or your inbox (provided you set up a forwarding address and alert preferences in your Bing Webmaster Tools profile). He has worked for IBM for the past 18 years, focusing on security technology including DCE, IBM Network Authentication Services (IBM Kerberos) and SPNEGO TAI.
For example, if a user authenticates to the KDC, that identity and authentication status is then used to request services that are in that trusted realm. You will create a _kerberos and _kpasswd service for both TCP and UDP, which will result in four unique entries.
Make sure there is a _kerberos Text entry that lists the System z server's realm name, and a host entry that lists the System z server's host name and IP address.
In the Local intranet window, ensure that the check box to Include all local (intranet) not listed in other zones is selected, and then click Advanced.In the Local intranet window, fill in the Add this Web site to the zone field with the host name's Web address so that single sign-on (SSO) can be enabled to the list of Web sites shown in the Web sites field (Figure 38).
This is a sufficient control to prevent this behavior, but if your Kerberos environment only interacts with a Windows KDC, it might also be beneficial to prohibit this behavior when defining each user's Kerberos ID. The reason is simple: the IP addresses or ranges we use can change any time, so responding to requests differently based on a hardcoded list is not a recommended approach and may cause problems down the line. In this type of scenario, users authenticate once to the KDC, and then their authentications are valid for a predetermined time period.
The reason this is necessary is due to the manner in which the RACF RDEFINE command converts all characters to UPPERCASE before submitting to RACF.


This preference lists the sites for which the browser may delegate user authorization to the server.
To generate this key, a password must be associated with this ID; however, this ID should not be able to log onto the system.
Users can then access services on other machines that participate in this trusted network without again being prompted for a user ID and password. Ensure that the Enable Integrated Windows Authentication (requires restart) box is selected.Click OK. You should see a fully qualified domain name (FQDN) that matches the real FQDN of the System z host. Levels are numeric values 0 through 9, where 0 turns debug off for that component and 9 generates the most information, including memory dumps. This means that not all UNIX Kerberos commands are available; for instance, the kadmin command does not function. The SPNEGO TAI uses the JRas facility to enable an administrator to trace only specific classes. Instead, the administrator must know how to translate these commands into RACF commands.RACF definitionsSince this solution assumes that user IDs will be identical between Windows and RACF, you must ensure that you have similar IDs for your testing. This means that instead of requiring an application running in WebSphere Application Server to know about Kerberos, the SPNEGO TAI can be configured to authenticate users coming into WebSphere Application Server that present a SPNEGO token. This means that you are able to set trimUserName to True when you configure the SPNEGO properties and do not have to map the Kerberos principal name to a RACF ID. If your Kerberos principal names and RACF user ID registries identify users differently, you must write a custom JAAS LoginModule to map Kerberos principal names from Active Directory to RACF IDs, and possibly from RACF IDs to Kerberos principal names.
See the WebSphere Application Server Information Center for information on how to write a custom JAAS LoginModule.Figure 1.
In reality, few organizations have an organization-wide naming convention that mandates their AD users have the same ID as their RACF users. A sample JAAS login module that performs this type of mapping can be found in the WebSphere Application Server Information Center.



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