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000-886 - IBM Tivoli Monitoring v5.1.1 to v5.1.2 Implementation - Dump Information

Vendor : IBM
Exam Code : 000-886
Exam Name : IBM Tivoli Monitoring v5.1.1 to v5.1.2 Implementation
Questions and Answers : 152 Q & A
Updated On : May 17, 2019
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Test Code : 000-886
Test Name : IBM Tivoli Monitoring v5.1.1 to v5.1.2 Implementation
Vendor Name : IBM
Q&A : 152 Real Questions

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IBM Tivoli Monitoring v5.1.1 to v5.1.2 Implementation education

GSSAPI Authentication and Kerberos v5 | 000-886 Real Questions and VCE Practice Test

This chapter is from the publication 

This section discusses the GSSAPI mechanism, in selected, Kerberos v5 and how this works along side the solar ONE directory Server 5.2 application and what is concerned in implementing such a solution. Please be aware that here is no longer a trivial project.

It’s price taking a quick appear on the relationship between the regularly occurring safety services application application Interface (GSSAPI) and Kerberos v5.

The GSSAPI does not truly give protection functions itself. somewhat, it's a framework that gives protection capabilities to callers in a prevalent fashion, with a variety of underlying mechanisms and applied sciences equivalent to Kerberos v5. The current implementation of the GSSAPI simplest works with the Kerberos v5 security mechanism. The finest technique to believe about the relationship between GSSAPI and Kerberos is in right here manner: GSSAPI is a community authentication protocol abstraction that permits Kerberos credentials to be used in an authentication trade. Kerberos v5 must be put in and operating on any device on which GSSAPI-mindful classes are operating.

The support for the GSSAPI is made feasible in the listing server during the introduction of a brand new SASL library, which is in response to the Cyrus CMU implementation. via this SASL framework, DIGEST-MD5 is supported as defined previously, and GSSAPI which implements Kerberos v5. extra GSSAPI mechanisms do exist. for instance, GSSAPI with SPNEGO help can be GSS-SPNEGO. different GSS mechanism names are based on the GSS mechanisms OID.

The sun ONE directory Server 5.2 software simplest helps the use of GSSAPI on Solaris OE. There are implementations of GSSAPI for other operating techniques (as an instance, Linux), but the sun ONE directory Server 5.2 utility does not use them on platforms aside from the Solaris OE.

figuring out GSSAPI

The popular protection capabilities software application Interface (GSSAPI) is a common interface, described by RFC 2743, that provides a customary authentication and cozy messaging interface, whereby these security mechanisms can be plugged in. probably the most frequently spoke of GSSAPI mechanism is the Kerberos mechanism it is according to secret key cryptography.

one of the crucial main elements of GSSAPI is that it makes it possible for builders to add comfortable authentication and privateness (encryption and or integrity checking) protection to facts being passed over the wire by means of writing to a single programming interface. here's shown in determine three-2.

03fig02.gifdetermine 3-2. GSSAPI Layers

The underlying safety mechanisms are loaded on the time the classes are finished, as hostile to when they're compiled and built. In follow, essentially the most time-honored GSSAPI mechanism is Kerberos v5. The Solaris OE provides a couple of distinct flavors of Diffie-Hellman GSSAPI mechanisms, which can be most effective valuable to NIS+ functions.

What can also be perplexing is that developers may write applications that write without delay to the Kerberos API, or they may write GSSAPI purposes that request the Kerberos mechanism. there is a big difference, and functions that talk Kerberos without delay cannot speak with folks that speak GSSAPI. The wire protocols are not appropriate, however the underlying Kerberos protocol is in use. An instance is telnet with Kerberos is a comfy telnet program that authenticates a telnet consumer and encrypts information, including passwords exchanged over the community all the way through the telnet session. The authentication and message protection aspects are supplied using Kerberos. The telnet application with Kerberos most effective uses Kerberos, which is in accordance with secret-key know-how. besides the fact that children, a telnet software written to the GSSAPI interface can use Kerberos in addition to other security mechanisms supported via GSSAPI.

The Solaris OE does not convey any libraries that deliver assist for third-birthday celebration groups to application at once to the Kerberos API. The goal is to motivate developers to make use of the GSSAPI. Many open-source Kerberos implementations (MIT, Heimdal) permit users to write Kerberos functions without delay.

On the wire, the GSSAPI is appropriate with Microsoft’s SSPI and hence GSSAPI purposes can talk with Microsoft functions that use SSPI and Kerberos.

The GSSAPI is favorite since it is a standardized API, whereas Kerberos isn't. This skill that the MIT Kerberos construction crew might trade the programming interface each time, and any functions that exist nowadays might now not work sooner or later devoid of some code changes. the usage of GSSAPI avoids this issue.

an extra improvement of GSSAPI is its pluggable feature, which is a huge advantage, principally if a developer later decides that there is a stronger authentication method than Kerberos, since it can conveniently be plugged into the system and the present GSSAPI functions should still be capable of use it with out being recompiled or patched in any way.

knowing Kerberos v5

Kerberos is a community authentication protocol designed to deliver powerful authentication for customer/server applications by using secret-key cryptography. in the beginning developed on the Massachusetts Institute of expertise, it's protected in the Solaris OE to supply robust authentication for Solaris OE network purposes.

moreover offering a cozy authentication protocol, Kerberos also presents the skill to add privateness assist (encrypted information streams) for far flung functions corresponding to telnet, ftp, rsh, rlogin, and other normal UNIX network functions. in the Solaris OE, Kerberos can even be used to supply strong authentication and privateness aid for community File programs (NFS), allowing comfortable and private file sharing throughout the network.

as a result of its widespread acceptance and implementation in other working systems, including home windows 2000, HP-UX, and Linux, the Kerberos authentication protocol can interoperate in a heterogeneous ambiance, enabling users on machines working one OS to soundly authenticate themselves on hosts of a unique OS.

The Kerberos application is available for Solaris OE types 2.6, 7, 8, and 9 in a separate equipment referred to as the solar commercial enterprise Authentication Mechanism (SEAM) software. For Solaris 2.6 and Solaris 7 OE, sun commercial enterprise Authentication Mechanism utility is blanketed as a part of the Solaris convenient entry Server three.0 (Solaris SEAS) package. For Solaris 8 OE, the sun commercial enterprise Authentication Mechanism application package is accessible with the Solaris eight OE Admin Pack.

For Solaris 2.6 and Solaris 7 OE, the solar enterprise Authentication Mechanism application is freely obtainable as part of the Solaris easy access Server three.0 equipment obtainable for down load from:


For Solaris eight OE programs, solar enterprise Authentication Mechanism software is available in the Solaris 8 OE Admin Pack, purchasable for download from:

http://www.solar.com/bigadmin/content material/adminPack/index.html.

For Solaris 9 OE techniques, sun business Authentication Mechanism utility is already put in by using default and incorporates here applications listed in table 3-1.

table 3-1. Solaris 9 OE Kerberos v5 applications

package name



Kerberos v5 KDC (root)


Kerberos v5 master KDC (consumer)


Kerberos edition 5 support (Root)


Kerberos version 5 aid (Usr)


Kerberos version 5 help (Usr) (64-bit)

All of those solar commercial enterprise Authentication Mechanism application distributions are in accordance with the MIT KRB5 release version 1.0. The customer classes in these distributions are compatible with later MIT releases (1.1, 1.2) and with other implementations which are compliant with the commonplace.

How Kerberos Works

the following is an overview of the Kerberos v5 authentication equipment. From the person’s standpoint, Kerberos v5 is basically invisible after the Kerberos session has been all started. Initializing a Kerberos session regularly contains no greater than logging in and featuring a Kerberos password.

The Kerberos equipment revolves across the idea of a ticket. A ticket is a group of digital counsel that serves as identification for a user or a carrier such as the NFS service. simply as your driver’s license identifies you and indicates what driving permissions you've got, so a ticket identifies you and your community entry privileges. when you perform a Kerberos-primarily based transaction (for instance, in case you use rlogin to log in to yet another laptop), your system transparently sends a request for a ticket to a Key Distribution center, or KDC. The KDC accesses a database to authenticate your identity and returns a ticket that provides you permission to access the other machine. Transparently capacity that you do not deserve to explicitly request a ticket.

Tickets have certain attributes associated with them. as an example, a ticket will also be forwardable (which skill that it can be used on one other laptop devoid of a new authentication system), or postdated (now not valid until a unique time). How tickets are used (as an instance, which clients are allowed to acquire which kinds of tickets) is set with the aid of guidelines that are decided when Kerberos is installed or administered.

you will generally see the phrases credential and ticket. within the Kerberos world, they are sometimes used interchangeably. Technically, however, a credential is a ticket plus the session key for that session.

preliminary Authentication

Kerberos authentication has two phases, an initial authentication that permits for all subsequent authentications, and the following authentications themselves.

a client (a person, or a service comparable to NFS) starts off a Kerberos session by way of asking for a ticket-granting ticket (TGT) from the key Distribution center (KDC). This request is regularly finished immediately at login.

A ticket-granting ticket is required to gain other tickets for specific services. suppose of the ticket-granting ticket as whatever thing akin to a passport. Like a passport, the ticket-granting ticket identifies you and allows you to gain a large number of “visas,” the place the “visas” (tickets) aren't for foreign nations, but for far off machines or network functions. Like passports and visas, the ticket-granting ticket and the other a considerable number of tickets have confined lifetimes. The change is that Kerberized commands word that you've a passport and obtain the visas for you. You don’t need to perform the transactions your self.

The KDC creates a ticket-granting ticket and sends it again, in encrypted form, to the client. The client decrypts the ticket-granting ticket the use of the client’s password.

Now in possession of a legitimate ticket-granting ticket, the customer can request tickets for all styles of network operations for so long as the ticket-granting ticket lasts. This ticket constantly lasts for a number of hours. each and every time the customer performs a unique network operation, it requests a ticket for that operation from the KDC.

Subsequent Authentications

The customer requests a ticket for a selected carrier from the KDC by way of sending the KDC its ticket-granting ticket as proof of id.

  • The KDC sends the ticket for the selected provider to the client.

    as an example, believe person lucy wants to entry an NFS file equipment that has been shared with krb5 authentication required. since she is already authenticated (it's, she already has a ticket-granting ticket), as she attempts to entry the files, the NFS customer system instantly and transparently obtains a ticket from the KDC for the NFS carrier.

  • The customer sends the ticket to the server.

    When the usage of the NFS carrier, the NFS client immediately and transparently sends the ticket for the NFS provider to the NFS server.

  • The server allows the customer access.

    These steps make it appear that the server doesn’t ever talk with the KDC. The server does, though, because it registers itself with the KDC, just because the first customer does.

  • Principals

    a consumer is identified by using its major. A fundamental is a distinct identification to which the KDC can assign tickets. A principal can also be a consumer, corresponding to joe, or a service, comparable to NFS.

    by convention, a primary identify is divided into three constituents: the basic, the example, and the realm. a typical important could be, for example, lucy/admin@example.COM, where:

    lucy is the simple. The simple may also be a person identify, as shown here, or a carrier, akin to NFS. The simple can even be the notice host, which means that this most important is a carrier fundamental it's set up to supply a number of community features.

    admin is the illustration. An illustration is non-compulsory within the case of person principals, however is required for carrier principals. as an example, if the user lucy every so often acts as a device administrator, she will use lucy/admin to distinguish herself from her general consumer identity. Likewise, if Lucy has money owed on two distinctive hosts, she will use two fundamental names with diverse instances (as an example, lucy/california.instance.com and lucy/boston.instance.com).

    geographical regions

    A realm is a logical network, similar to a website, which defines a group of programs under the identical master KDC. Some geographical regions are hierarchical (one realm being a superset of the different realm). in any other case, the geographical regions are non-hierarchical (or direct) and the mapping between both nation-states have to be described.

    realms and KDC Servers

    every realm must include a server that continues the master reproduction of the most important database. This server is called the grasp KDC server. moreover, every realm should contain at the least one slave KDC server, which contains reproduction copies of the principal database. each the master KDC server and the slave KDC server create tickets which are used to establish authentication.

    understanding the Kerberos KDC

    The Kerberos Key Distribution core (KDC) is a depended on server that concerns Kerberos tickets to shoppers and servers to communicate securely. A Kerberos ticket is a block of statistics it is offered as the user’s credentials when trying to entry a Kerberized provider. A ticket incorporates counsel in regards to the person’s identity and a short lived encryption key, all encrypted within the server’s inner most key. within the Kerberos environment, any entity it really is described to have a Kerberos identification is referred to as a important.

    A principal may be an entry for a selected person, host, or carrier (corresponding to NFS or FTP) that is to interact with the KDC. Most generally, the KDC server device additionally runs the Kerberos Administration Daemon, which handles administrative instructions akin to including, deleting, and editing principals in the Kerberos database. customarily, the KDC, the admin server, and the database are all on the equal desktop, however they can also be separated if fundamental. Some environments may additionally require that dissimilar realms be configured with grasp KDCs and slave KDCs for every realm. The principals utilized for securing each realm and KDC should still be utilized to all realms and KDCs in the community to make sure that there isn’t a single susceptible hyperlink in the chain.

    one of the crucial first steps to take when initializing your Kerberos database is to create it using the kdb5_util command, which is discovered in /usr/sbin. When running this command, the user has the alternative of whether to create a stash file or now not. The stash file is a native replica of the grasp key that resides on the KDC’s native disk. The master key contained within the stash file is generated from the master password that the person enters when first developing the KDC database. The stash file is used to authenticate the KDC to itself automatically before beginning the kadmind and krb5kdc daemons (for example, as a part of the computer’s boot sequence).

    If a stash file is not used when the database is created, the administrator who begins up the krb5kdc procedure will must manually enter the master key (password) every time they beginning the manner. This might also appear like a regular trade off between comfort and protection, but if the relaxation of the device is sufficiently hardened and guarded, very little safety is lost by means of having the grasp key kept in the blanketed stash file. it's recommended that at the least one slave KDC server be put in for every realm to make certain that a backup is purchasable in the experience that the grasp server becomes unavailable, and that slave KDC be configured with the same degree of safety because the master.

    at present, the sun Kerberos v5 Mechanism utility, kdb5_util, can create three types of keys, DES-CBC-CRC, DES-CBC-MD5, and DES-CBC-raw. DES-CBC stands for DES encryption with Cipher Block Chaining and the CRC, MD5, and raw designators consult with the checksum algorithm it is used. by means of default, the key created will be DES-CBC-CRC, which is the default encryption classification for the KDC. The type of key created is distinctive on the command line with the -k choice (see the kdb5_util (1M) man web page). opt for the password on your stash file very carefully, because this password may also be used sooner or later to decrypt the master key and regulate the database. The password may be as much as 1024 characters long and may include any aggregate of letters, numbers, punctuation, and spaces.

    right here is an illustration of creating a stash file:

    kdc1 #/usr/sbin/kdb5_util create -r instance.COM -s Initializing database '/var/krb5/primary' for realm 'example.COM' master key name 'ok/M@illustration.COM' You can be triggered for the database master Password. it is important that you simply not forget this password. Enter KDC database master key: master_key Re-enter KDC database grasp key to check: master_key

    note the use of the -s argument to create the stash file. The area of the stash file is in the /var/krb5. The stash file seems with right here mode and ownership settings:

    kdc1 # cd /var/krb5 kdc1 # ls -l -rw------- 1 root other 14 Apr 10 14:28 .k5.instance.COM

    The listing used to save the stash file and the database should now not be shared or exported.

    at ease Settings in the KDC Configuration File

    The KDC and Administration daemons each study configuration suggestions from /and many others/krb5/kdc.conf. This file consists of KDC-particular parameters that govern typical habits for the KDC and for particular realms. The parameters in the kdc.conf file are explained in element in the kdc.conf(four) man web page.

    The kdc.conf parameters describe places of quite a few information and ports to use for having access to the KDC and the administration daemon. These parameters generally do not need to be modified, and doing so doesn't outcome in any added safety. however, there are some parameters that can be adjusted to increase the normal safety of the KDC. right here are some examples of adjustable parameters that raise protection.

  • kdc_ports – Defines the ports that the KDC will listen on to get hold of requests. The standard port for Kerberos v5 is 88. 750 is protected and prevalent to guide older customers that still use the default port particular for Kerberos v4. Solaris OE nonetheless listens on port 750 for backwards compatibility. here is now not considered a protection possibility.

  • max_life – Defines the highest lifetime of a ticket, and defaults to eight hours. In environments the place it's eye-catching to have clients re-authenticate frequently and to reduce the probability of having a foremost’s credentials stolen, this cost should be reduced. The counseled value is eight hours.

  • max_renewable_life – Defines the period of time from when a ticket is issued that it can be renewed (the usage of kinit -R). The standard cost here is 7 days. To disable renewable tickets, this value could be set to 0 days, 0 hrs, 0 min. The recommended cost is 7d 0h 0m 0s.

  • default_principal_expiration – A Kerberos foremost is any interesting identification to which Kerberos can assign a ticket. in the case of clients, it is an identical because the UNIX system user name. The default lifetime of any major in the realm can be defined in the kdc.conf file with this option. This should still be used best if the realm will contain temporary principals, otherwise the administrator will should continuously be renewing principals. constantly, this surroundings is left undefined and principals do not expire. this is now not insecure provided that the administrator is vigilant about doing away with principals for clients that not want entry to the methods.

  • supported_enctypes – The encryption kinds supported with the aid of the KDC can be defined with this choice. at the present, sun commercial enterprise Authentication Mechanism utility best supports des-cbc-crc:typical encryption type, but in the future this could be used to be sure that most effective potent cryptographic ciphers are used.

  • dict_file – The location of a dictionary file containing strings that aren't allowed as passwords. A principal with any password coverage (see beneath) are not able to use words found in this dictionary file. this is now not described with the aid of default. the use of a dictionary file is a good way to evade clients from developing trivial passwords to give protection to their bills, and as a consequence helps prevent one of the crucial typical weaknesses in a pc community-guessable passwords. The KDC will simplest investigate passwords against the dictionary for principals which have a password policy association, so it's respectable practice to have at least one primary policy linked to all principals in the realm.

  • The Solaris OE has a default equipment dictionary it really is used through the spell application that may additionally also be used by using the KDC as a dictionary of ordinary passwords. The area of this file is: /usr/share/lib/dict/phrases. other dictionaries may well be substituted. The layout is one note or phrase per line.

    here is a Kerberos v5 /etc/krb5/kdc.conf example with recommended settings:

    # Copyright 1998-2002 solar Microsystems, Inc. All rights reserved. # Use is subject to license phrases. # #ident "@(#)kdc.conf 1.2 02/02/14 SMI" [kdcdefaults] kdc_ports = 88,750 [realms] ___default_realm___ = profile = /and so on/krb5/krb5.conf database_name = /var/krb5/main admin_keytab = /and many others/krb5/kadm5.keytab acl_file = /and many others/krb5/kadm5.acl kadmind_port = 749 max_life = 8h 0m 0s max_renewable_life = 7d 0h 0m 0s default_principal_flags = +preauth wants moving -- dict_file = /usr/share/lib/dict/words entry manage

    The Kerberos administration server allows for for granular handle of the administrative commands by use of an access manage listing (ACL) file (/etc/krb5/kadm5.acl). The syntax for the ACL file permits for wildcarding of major names so it is not imperative to record every single administrator in the ACL file. This feature should still be used with extremely good care. The ACLs used by using Kerberos permit privileges to be damaged down into very precise functions that each administrator can function. If a certain administrator only must be allowed to have read-entry to the database then that adult may still not be granted full admin privileges. under is an inventory of the privileges allowed:

  • a – allows the addition of principals or guidelines within the database.

  • A – Prohibits the addition of principals or policies in the database.

  • d – permits the deletion of principals or guidelines within the database.

  • D – Prohibits the deletion of principals or policies in the database.

  • m – allows for the change of principals or guidelines within the database.

  • M – Prohibits the change of principals or policies in the database.

  • c – permits the changing of passwords for principals within the database.

  • C – Prohibits the changing of passwords for principals within the database.

  • i – makes it possible for inquiries to the database.

  • I – Prohibits inquiries to the database.

  • l – makes it possible for the listing of principals or guidelines within the database.

  • L – Prohibits the list of principals or guidelines within the database.

  • * – short for all privileges (admcil).

  • x – short for all privileges (admcil). identical to *.

  • adding administrators

    After the ACLs are install, specific administrator principals should be delivered to the equipment. it's strongly counseled that administrative users have separate /admin principals to use simplest when administering the system. as an example, consumer Lucy would have two principals within the database - lucy@REALM and lucy/admin@REALM. The /admin major would simplest be used when administering the device, not for getting ticket-granting-tickets (TGTs) to entry far flung services. using the /admin fundamental best for administrative purposes minimizes the opportunity of a person strolling as much as Joe’s unattended terminal and performing unauthorized administrative commands on the KDC.

    Kerberos principals could be differentiated by using the example a part of their major name. within the case of person principals, the most ordinary illustration identifier is /admin. it is normal observe in Kerberos to differentiate user principals by means of defining some to be /admin instances and others to haven't any selected example identifier (for instance, lucy/admin@REALM versus lucy@REALM). Principals with the /admin illustration identifier are assumed to have administrative privileges defined in the ACL file and will best be used for administrative purposes. A principal with an /admin identifier which does not healthy up with any entries within the ACL file aren't granted any administrative privileges, it should be treated as a non-privileged consumer foremost. additionally, user principals with the /admin identifier are given separate passwords and separate permissions from the non-admin most important for a similar user.

    right here is a pattern /and many others/krb5/kadm5.acl file:

    # Copyright (c) 1998-2000 by means of sun Microsystems, Inc. # All rights reserved. # #pragma ident "@(#)kadm5.acl 1.1 01/03/19 SMI" # lucy/admin is given full administrative privilege lucy/admin@example.COM * # # tom/admin person is allowed to question the database (d), directoryprincipals # (l), and altering consumer passwords (c) # tom/admin@example.COM dlc

    it is enormously informed that the kadm5.acl file be tightly controlled and that users be granted only the privileges they need to function their assigned tasks.

    creating Host Keys

    creating host keys for methods in the realm akin to slave KDCs is performed the equal means that creating person principals is performed. however, the -randkey choice may still all the time be used, so no person ever knows the genuine key for the hosts. Host principals are nearly always saved within the keytab file, for use by means of root-owned processes that need to act as Kerberos functions for the local host. it's infrequently vital for any individual to in reality recognize the password for a number foremost since the secret is kept safely in the keytab and is simply purchasable via root-owned techniques, in no way by specific clients.

    When developing keytab info, the keys may still all the time be extracted from the KDC on the equal machine the place the keytab is to reside the usage of the ktadd command from a kadmin session. If here is no longer feasible, take exceptional care in transferring the keytab file from one computer to the next. A malicious attacker who possesses the contents of the keytab file might use these keys from the file to be able to gain access to one other user or capabilities credentials. Having the keys would then permit the attacker to impersonate whatever fundamental that the key represented and extra compromise the protection of that Kerberos realm. Some assistance for transferring the keytab are to use Kerberized, encrypted ftp transfers, or to use the relaxed file switch classes scp or sftp offered with the SSH kit (http://www.openssh.org). one more protected formulation is to vicinity the keytab on a detachable disk, and hand-convey it to the vacation spot.

    Hand start does not scale well for giant installations, so the usage of the Kerberized ftp daemon is possibly essentially the most effortless and secure formula obtainable.

    the use of NTP to Synchronize Clocks

    All servers participating in the Kerberos realm need to have their equipment clocks synchronized to inside a configurable cut-off date (default 300 seconds). The safest, most comfy technique to systematically synchronize the clocks on a network of Kerberos servers is through the use of the community Time Protocol (NTP) carrier. The Solaris OE comes with an NTP customer and NTP server application (SUNWntpu package). See the ntpdate(1M) and xntpd(1M) man pages for greater information on the individual commands. For greater assistance on configuring NTP, refer to here solar BluePrints online NTP articles:

    it's crucial that the time be synchronized in a secure manner. a simple denial of service attack on either a consumer or a server would involve simply skewing the time on that equipment to be outdoor of the configured clock skew price, which might then avoid any person from acquiring TGTs from that system or getting access to Kerberized features on that equipment. The default clock-skew cost of five minutes is the maximum suggested price.

    The NTP infrastructure need to also be secured, together with using server hardening for the NTP server and application of NTP security facets. the usage of the Solaris protection Toolkit application (formerly known as JASS) with the secure.driver script to create a minimal equipment and then installation just the integral NTP software is one such system. The Solaris safety Toolkit utility is available at:


    Documentation on the Solaris security Toolkit utility is accessible at:


    organising Password guidelines

    Kerberos permits the administrator to define password guidelines that can be applied to a couple or all the consumer principals within the realm. A password policy includes definitions for right here parameters:

  • minimum Password size – The number of characters in the password, for which the recommended cost is eight.

  • highest Password courses – The variety of distinctive personality classes that ought to be used to make up the password. Letters, numbers, and punctuation are the three classes and legitimate values are 1, 2, and 3. The counseled price is 2.

  • Saved Password history – The variety of old passwords that have been used by way of the foremost that can't be reused. The suggested price is 3.

  • minimum Password Lifetime (seconds) – The minimum time that the password must be used earlier than it can also be changed. The informed price is 3600 (1 hour).

  • highest Password Lifetime (seconds) – The optimum time that the password can also be used before it ought to be changed. The recommended cost is 7776000 (90 days).

  • These values can be set as a gaggle and kept as a single policy. distinct guidelines may also be described for different principals. it's recommended that the minimal password size be set to at least 8 and that at least 2 classes be required. Most individuals are likely to opt for handy-to-remember and straightforward-to-category passwords, so it's a good idea to at the least deploy guidelines to motivate a bit of extra problematic-to-guess passwords by using these parameters. surroundings the optimum Password Lifetime price may be positive in some environments, to force people to exchange their passwords periodically. The duration is as much as the native administrator in keeping with the overriding corporate protection policy used at that selected web site. surroundings the Saved Password historical past price mixed with the minimal Password Lifetime value prevents people from effortlessly switching their password a few instances unless they get back to their normal or favourite password.

    The highest password size supported is 255 characters, unlike the UNIX password database which handiest supports as much as eight characters. Passwords are stored in the KDC encrypted database the use of the KDC default encryption components, DES-CBC-CRC. in an effort to avoid password guessing attacks, it is advised that users choose long passwords or flow phrases. The 255 personality restrict permits one to opt for a small sentence or easy to remember phrase as an alternative of an easy one-note password.

    it is possible to use a dictionary file that may also be used to steer clear of clients from determining common, convenient-to-wager words (see “cozy Settings within the KDC Configuration File” on page 70). The dictionary file is barely used when a predominant has a policy association, so it is enormously suggested that as a minimum one policy be in effect for all principals within the realm.

    here is an instance password coverage advent:

    in case you specify a kadmin command with out specifying any alternate options, kadmin displays the syntax (utilization tips) for that command. here code container shows this, followed with the aid of an specific add_policy command with options.

    kadmin: add_policy utilization: add_policy [options] coverage alternatives are: [-maxlife time] [-minlife time] [-minlength length] [-minclasses number] [-history number] kadmin: add_policy -minlife "1 hour" -maxlife "ninety days" -minlength 8 -minclasses 2 -background 3 passpolicy kadmin: get_policy passpolicy coverage: passpolicy optimum password life: 7776000 minimal password existence: 3600 minimum password length: eight minimum number of password persona classes: 2 variety of historical keys saved: 3 Reference count number: 0

    This illustration creates a password coverage called passpolicy which enforces a optimum password lifetime of ninety days, minimal size of 8 characters, a minimum of 2 different persona classes (letters, numbers, punctuation), and a password background of 3.

    To follow this policy to an latest consumer, modify right here:

    kadmin: modprinc -policy passpolicy lucyPrincipal "lucy@instance.COM" modified.

    To regulate the default coverage it really is utilized to all person principals in a realm, change right here:

    kadmin: modify_policy -maxlife "ninety days" -minlife "1 hour" -minlength eight -minclasses 2 -background 3 default kadmin: get_policy default policy: default maximum password life: 7776000 minimal password lifestyles: 3600 minimum password length: eight minimum variety of password persona courses: 2 variety of old keys stored: three Reference count number: 1

    The Reference count number value shows what number of principals are configured to make use of the coverage.

    The default policy is immediately utilized to all new principals that aren't given the identical password as the essential identify when they're created. Any account with a coverage assigned to it's makes use of the dictionary (defined in the dict_file parameter in /and so forth/krb5/kdc.conf) to examine for commonplace passwords.

    Backing Up a KDC

    Backups of a KDC device may still be made consistently or in line with local policy. despite the fact, backups should still exclude the /etc/krb5/krb5.keytab file. If the local policy requires that backups be accomplished over a network, then these backups should be secured either through the use of encryption or might be through the use of a separate community interface that is just used for backup applications and is not exposed to the identical site visitors because the non-backup community site visitors. Backup storage media may still at all times be kept in a secure, fireproof region.

    Monitoring the KDC

    once the KDC is configured and working, it would be invariably and vigilantly monitored. The sun Kerberos v5 software KDC logs counsel into the /var/krb5/kdc.log file, but this region will also be modified within the /and so forth/krb5/krb5.conf file, in the logging part.

    [logging] default = FILE:/var/krb5/kdc.log kdc = FILE:/var/krb5/kdc.log

    The KDC log file should still have study and write permissions for the root user simplest, as follows:

    -rw------ 1 root different 750 25 may 10 17:fifty five /var/krb5/kdc.log Kerberos options

    The /and many others/krb5/krb5.conf file includes information that each one Kerberos purposes use to examine what server to check with and what realm they're collaborating in. Configuring the krb5.conf file is covered in the solar commercial enterprise Authentication Mechanism software setting up e-book. also consult with the krb5.conf(four) man page for a full description of this file.

    The appdefaults part in the krb5.conf file contains parameters that manage the habits of many Kerberos customer equipment. each tool may have its own section within the appdefaults part of the krb5.conf file.

    many of the functions that use the appdefaults area, use the equal alternate options; although, they might possibly be set in alternative ways for every customer software.

    Kerberos client purposes

    right here Kerberos functions can have their behavior modified through the person of options set in the appdefaults element of the /and many others/krb5/krb5.conf file or by using numerous command-line arguments. These consumers and their configuration settings are described under.


    The kinit customer is used by using individuals who are looking to acquire a TGT from the KDC. The /and so forth/krb5/krb5.conf file supports right here kinit options: renewable, forwardable, no_addresses, max_life, max_renewable_life and proxiable.


    The Kerberos telnet client has many command-line arguments that handle its behavior. check with the man page for finished tips. despite the fact, there are a number of unique safety issues involving the Kerberized telnet client.

    The telnet customer uses a session key even after the carrier ticket which it turned into derived from has expired. This capability that the telnet session continues to be active even after the ticket at the beginning used to benefit entry, is no longer legitimate. here is insecure in a strict environment, besides the fact that children, the exchange off between ease of use and strict safety tends to lean in want of ease-of-use during this situation. it is recommended that the telnet connection be re-initialized periodically by using disconnecting and reconnecting with a brand new ticket. The standard lifetime of a ticket is defined with the aid of the KDC (/and so forth/krb5/kdc.conf), always described as eight hours.

    The telnet client allows for the person to forward a duplicate of the credentials (TGT) used to authenticate to the far flung system the usage of the -f and -F command-line alternate options. The -f option sends a non-forwardable replica of the native TGT to the far off device in order that the consumer can access Kerberized NFS mounts or different native Kerberized features on that system handiest. The -F option sends a forwardable TGT to the faraway equipment in order that the TGT may also be used from the remote system to profit extra entry to different faraway Kerberos features past that point. The -F choice is a superset of -f. If the Forwardable and or forward options are set to false in the krb5.conf file, these command-line arguments may also be used to override these settings, for that reason giving people the control over even if and how their credentials are forwarded.

    The -x alternative should be used to turn on encryption for the statistics movement. This further protects the session from eavesdroppers. If the telnet server does not help encryption, the session is closed. The /and so on/krb5/krb5.conf file supports here telnet options: ahead, forwardable, encrypt, and autologin. The autologin [true/false] parameter tells the customer to are attempting and try to log in with out prompting the person for a user name. The native consumer identify is handed on to the far flung equipment in the telnet negotiations.

    rlogin and rsh

    The Kerberos rlogin and rsh customers behave an awful lot the equal as their non-Kerberized equivalents. because of this, it is counseled that in the event that they are required to be covered in the community data equivalent to /etc/hosts.equiv and .rhosts that the root users directory be removed. The Kerberized versions have the added benefit of the usage of Kerberos protocol for authentication and might additionally use Kerberos to protect the privacy of the session the use of encryption.

    corresponding to telnet described in the past, the rlogin and rsh valued clientele use a session key after the provider ticket which it became derived from has expired. thus, for maximum safety, rlogin and rsh classes should be re-initialized periodically. rlogin uses the -f, -F, and -x alternatives within the same fashion as the telnet customer. The /and so forth/krb5/krb5.conf file helps right here rlogin alternatives: forward, forwardable, and encrypt.

    Command-line options override configuration file settings. for example, if the rsh part within the krb5.conf file suggests encrypt false, but the -x choice is used on the command line, an encrypted session is used.


    Kerberized rcp will also be used to transfer files securely between methods the use of Kerberos authentication and encryption (with the -x command-line option). It does not prompt for passwords, the user have to have already got a valid TGT before using rcp if they want to use the encryption characteristic. however, pay attention if the -x option is not used and no native credentials can be found, the rcp session will revert to the general, non-Kerberized (and insecure) rcp behavior. it's enormously advised that users always use the -x option when the use of the Kerberized rcp customer.The /and many others/krb5/krb5.conf file supports the encrypt [true/false] choice.


    The Kerberos login software (login.krb5) is forked from a a hit authentication by means of the Kerberized telnet daemon or the Kerberized rlogin daemon. This Kerberos login daemon is become independent from the commonplace Solaris OE login daemon and as a consequence, the standard Solaris OE elements similar to BSM auditing aren't yet supported when the usage of this daemon. The /etc/krb5/krb5.conf file supports the krb5_get_tickets [true/false] option. If this option is determined to actual, then the login application will generate a new Kerberos ticket (TGT) for the consumer upon relevant authentication.


    The solar enterprise Authentication Mechanism (SEAM) edition of the ftp customer uses the GSSAPI (RFC 2743) with Kerberos v5 because the default mechanism. This capability that it uses Kerberos authentication and (optionally) encryption in the course of the Kerberos v5 GSS mechanism. The handiest Kerberos-linked command-line alternate options are -f and -m. The -f alternative is an identical as described above for telnet (there is not any want for a -F alternative). -m allows for the user to specify an option GSS mechanism in that case preferred, the default is to use the kerberos_v5 mechanism.

    The insurance policy degree used for the statistics switch will also be set the use of the protect command at the ftp immediate. sun commercial enterprise Authentication Mechanism application ftp supports here insurance plan tiers:

  • Clear unprotected, unencrypted transmission

  • safe facts is integrity covered the use of cryptographic checksums

  • private facts is transmitted with confidentiality and integrity using encryption

  • it is informed that clients set the insurance policy stage to private for all information transfers. The ftp client software does not aid or reference the krb5.conf file to locate any non-compulsory parameters. All ftp client alternate options are passed on the command line. See the man web page for the Kerberized ftp customer, ftp(1).

    In abstract, adding Kerberos to a network can raise the common safety obtainable to the clients and directors of that network. far off sessions can be securely authenticated and encrypted, and shared disks can also be secured and encrypted throughout the community. in addition, Kerberos permits the database of person and repair principals to be managed securely from any computing device which supports the SEAM application Kerberos protocol. SEAM is interoperable with different RFC 1510 compliant Kerberos implementations equivalent to MIT Krb5 and some MS windows 2000 energetic listing features. Adopting the practices informed during this part additional comfy the SEAM utility infrastructure to help make certain a safer network ambiance.

    implementing the sun ONE listing Server 5.2 application and the GSSAPI Mechanism

    This section provides a excessive-stage overview, adopted through the in-depth techniques that describe the setup vital to enforce the GSSAPI mechanism and the solar ONE listing Server 5.2 utility. This implementation assumes a realm of instance.COM for this goal. the following list offers an initial excessive-stage overview of the steps required, with the next part proposing the unique suggestions.

  • Setup DNS on the customer computing device. here is a crucial step as a result of Kerberos requires DNS.

  • install and configure the solar ONE directory Server version 5.2 utility.

  • check that the directory server and customer both have the SASL plug-ins installed.

  • deploy and configure Kerberos v5.

  • Edit the /and many others/krb5/krb5.conf file.

  • Edit the /and many others/krb5/kdc.conf file.

  • Edit the /and so forth/krb5/kadm5.acl file.

  • flow the kerberos_v5 line so it is the first line within the /etc/gss/mech file.

  • Create new principals using kadmin.local, which is an interactive commandline interface to the Kerberos v5 administration gadget.

  • regulate the rights for /and so forth/krb5/krb5.keytab. This access is necessary for the solar ONE listing Server 5.2 software.

  • Run /usr/sbin/kinit.

  • investigate that you've a ticket with /usr/bin/klist.

  • operate an ldapsearch, the use of the ldapsearch command-line tool from the solar ONE listing Server 5.2 utility to examine and verify.

  • The sections that comply with fill within the particulars.

    Configuring a DNS client

    To be a DNS customer, a computing device have to run the resolver. The resolver is neither a daemon nor a single program. it is a set of dynamic library routines used by means of applications that need to know machine names. The resolver’s feature is to resolve clients’ queries. To do that, it queries a name server, which then returns both the requested suggestions or a referral to a further server. as soon as the resolver is configured, a computer can request DNS provider from a name server.

    right here example suggests you how to configure the resolv.conf(4) file in the server kdc1 within the instance.com domain.

    ; ; /and many others/resolv.conf file for dnsmaster ; area instance.com nameserver nameserver

    the primary line of the /and so forth/resolv.conf file lists the area identify within the kind:

    domain domainname

    No areas or tabs are approved at the end of the domain identify. make certain that you simply press return automatically after the last persona of the area name.

    The 2nd line identifies the server itself in the form:

    nameserver IP_address

    Succeeding strains checklist the IP addresses of 1 or two slave or cache-simplest name servers that the resolver may still consult to resolve queries. identify server entries have the form:

    nameserver IP_address

    IP_address is the IP handle of a slave or cache-handiest DNS name server. The resolver queries these identify servers within the order they're listed except it obtains the suggestions it needs.

    For extra exact assistance of what the resolv.conf file does, check with the resolv.conf(4) man web page.

    To Configure Kerberos v5 (master KDC)

    in the this procedure, the following configuration parameters are used:

  • Realm name = illustration.COM

  • DNS domain name = illustration.com

  • master KDC = kdc1.instance.com

  • admin predominant = lucy/admin

  • online support URL = http://illustration:8888/ab2/coll.384.1/SEAM/@AB2PageView/6956

  • This manner requires that DNS is working.

    earlier than you start this configuration process, make a backup of the /etc/krb5 files.

  • develop into superuser on the grasp KDC. (kdc1, in this example)

  • Edit the Kerberos configuration file (krb5.conf).

    You deserve to alternate the realm names and the names of the servers. See the krb5.conf(4) man page for a full description of this file.

    kdc1 # extra /etc/krb5/krb5.conf [libdefaults] default_realm = example.COM [realms] illustration.COM = kdc = kdc1.example.com admin server = kdc1.example.com [domain_realm] .instance.com = illustration.COM [logging] default = FILE:/var/krb5/kdc.log kdc = FILE:/var/krb5/kdc.log [appdefaults] gkadmin = help_url = http://example:8888/ab2/coll.384.1/SEAM/@AB2PageView/6956

    during this example, the strains for domain_realm, kdc, admin_server, and all domain_realm entries had been changed. moreover, the line with ___slave_kdcs___ within the [realms] area changed into deleted and the road that defines the help_url became edited.

  • Edit the KDC configuration file (kdc.conf).

    You have to exchange the realm identify. See the kdc.conf( 4) man web page for a full description of this file.

    kdc1 # more /and so forth/krb5/kdc.conf [kdcdefaults] kdc_ports = 88,750 [realms] instance.COM= profile = /and so forth/krb5/krb5.conf database_name = /var/krb5/major admin_keytab = /and so forth/krb5/kadm5.keytab acl_file = /etc/krb5/kadm5.acl kadmind_port = 749 max_life = 8h 0m 0s max_renewable_life = 7d 0h 0m 0s need moving ---------> default_principal_flags = +preauth

    during this example, most effective the realm name definition in the [realms] section is changed.

  • Create the KDC database through the use of the kdb5_util command.

    The kdb5_util command, which is discovered in /usr/sbin, creates the KDC database. When used with the -s choice, this command creates a stash file it's used to authenticate the KDC to itself before the kadmind and krb5kdc daemons are began.

    kdc1 # /usr/sbin/kdb5_util create -r instance.COM -s Initializing database '/var/krb5/most important' for realm 'instance.COM' master key name 'ok/M@illustration.COM' You can be brought on for the database master Password. it is vital that you just now not forget this password. Enter KDC database grasp key: key Re-enter KDC database master key to assess: key

    The -r alternative followed via the realm name isn't required if the realm name is equivalent to the area identify within the server’s name area.

  • Edit the Kerberos entry control record file (kadm5.acl).

    as soon as populated, the /and so forth/krb5/kadm5.acl file contains all predominant names which are allowed to administer the KDC. the primary entry that is brought might look akin to right here:

    lucy/admin@example.COM *

    This entry gives the lucy/admin essential in the illustration.COM realm the means to modify principals or guidelines within the KDC. The default installation includes an asterisk (*) to fit all admin principals. This default is usually a safety chance, so it's greater cozy to include an inventory of the entire admin principals. See the kadm5.acl(four) man page for extra guidance.

  • Edit the /and so forth/gss/mech file.

    The /and so on/gss/mech file contains the GSSAPI primarily based safety mechanism names, its object identifier (OID), and a shared library that implements the capabilities for that mechanism below the GSSAPI. alternate right here from:

    # Mechanism name Object Identifier Shared Library Kernel Module # diffie_hellman_640_0 1.3.6.four. dh640-0.so.1 diffie_hellman_1024_0 dh1024-0.so.1 kerberos_v5 1.2.840.113554.1.2.2 gl/mech_krb5.so gl_kmech_krb5

    To the following:

    # Mechanism identify Object Identifier Shared Library Kernel Module # kerberos_v5 1.2.840.113554.1.2.2 gl/mech_krb5.so gl_kmech_krb5 diffie_hellman_640_0 1.three. dh640-0.so.1 diffie_hellman_1024_0 1.three. dh1024-0.so.1
  • Run the kadmin.native command to create principals.

    which you could add as many admin principals as you want. however you need to add at the least one admin main to comprehensive the KDC configuration manner. In the following example, lucy/admin is introduced because the most important.

    kdc1 # /usr/sbin/kadmin.native kadmin.local: addprinc lucy/admin Enter password for principal "lucy/admin@illustration.COM": Re-enter password for principal "lucy/admin@example.COM": most important "lucy/admin@instance.COM" created. kadmin.native:
  • Create a keytab file for the kadmind carrier.

    here command sequence creates a distinct keytab file with important entries for lucy and tom. These principals are necessary for the kadmind provider. additionally, which you could optionally add NFS provider principals, host principals, LDAP principals, and so forth.

    When the principal instance is a number name, the fully certified domain identify (FQDN) need to be entered in lowercase letters, despite the case of the domain identify within the /and so forth/resolv.conf file.

    kadmin.native: ktadd -ok /etc/krb5/kadm5.keytab kadmin/kdc1.instance.com Entry for fundamental kadmin/kdc1.illustration.com with kvno three, encryption category DES-CBC-CRC added to keytab WRFILE:/and so on/krb5/kadm5.keytab. kadmin.local: ktadd -ok /and many others/krb5/kadm5.keytab changepw/kdc1.illustration.com Entry for most important changepw/kdc1.instance.com with kvno 3, encryption class DES-CBC-CRC added to keytab WRFILE:/and so forth/krb5/kadm5.keytab. kadmin.native:

    after you have introduced all the required principals, you can exit from kadmin.local as follows:

    kadmin.native: quit
  • start the Kerberos daemons as shown:

    kdc1 # /and so forth/init.d/kdc delivery kdc1 # /and many others/init.d/kdc.master start


    You cease the Kerberos daemons by running right here instructions:

    kdc1 # /and so forth/init.d/kdc cease kdc1 # /and so on/init.d/kdc.grasp cease
  • Add principals by using the SEAM Administration device.

    To do this, you ought to go online with one of the most admin major names that you simply created previous during this manner. despite the fact, here command-line illustration is proven for simplicity.

    kdc1 # /usr/sbin/kadmin -p lucy/admin Enter password: kws_admin_password kadmin:
  • Create the master KDC host principal which is used with the aid of Kerberized functions reminiscent of klist and kprop.

    kadmin: addprinc -randkey host/kdc1.illustration.com important "host/kdc1.example.com@instance.COM" created. kadmin:
  • (optional) Create the master KDC root important which is used for authenticated NFS mounting.

    kadmin: addprinc root/kdc1.instance.com Enter password for major root/kdc1.instance.com@instance.COM: password Re-enter password for principal root/kdc1.illustration.com@illustration.COM: password predominant "root/kdc1.illustration.com@illustration.COM" created. kadmin:
  • Add the grasp KDC’s host major to the grasp KDC’s keytab file which enables this most important to be used immediately.

    kadmin: ktadd host/kdc1.example.com kadmin: Entry for primary host/kdc1.illustration.com with ->kvno 3, encryption type DES-CBC-CRC added to keytab ->WRFILE:/etc/krb5/krb5.keytab kadmin:

    upon getting added all the required principals, you could exit from kadmin as follows:

    kadmin: stop
  • Run the kinit command to gain and cache an initial ticket-granting ticket (credential) for the essential.

    This ticket is used for authentication by using the Kerberos v5 equipment. kinit most effective needs to be run by using the client at present. If the solar ONE listing server had been a Kerberos client also, this step would should be completed for the server. youngsters, you may are looking to use this to assess that Kerberos is up and working.

    kdclient # /usr/bin/kinit root/kdclient.illustration.com Password for root/kdclient.instance.com@example.COM: passwd
  • investigate and determine that you have a ticket with the klist command.

    The klist command studies if there is a keytab file and shows the principals. If the results reveal that there isn't any keytab file or that there is no NFS service predominant, you should assess the completion of all of the outdated steps.

    # klist -k Keytab name: FILE:/and so forth/krb5/krb5.keytab KVNO principal ---- ------------------------------------------------------------------ 3 nfs/host.instance.com@instance.COM

    The illustration given here assumes a single domain. The KDC can also dwell on the same computing device because the sun ONE listing server for checking out purposes, but there are protection issues to have in mind on the place the KDCs reside.

  • relating to the configuration of Kerberos v5 along side the sun ONE listing Server 5.2 application, you are comprehensive with the Kerberos v5 half. It’s now time to look at what's required to be configured on the sun ONE listing server facet.

    sun ONE listing Server 5.2 GSSAPI Configuration

    As up to now discussed, the well-known security features application program Interface (GSSAPI), is general interface that allows you to make use of a security mechanism equivalent to Kerberos v5 to authenticate customers. The server uses the GSSAPI to in fact validate the identification of a specific consumer. once this person is validated, it’s as much as the SASL mechanism to apply the GSSAPI mapping rules to gain a DN it is the bind DN for all operations all over the connection.

    the primary merchandise discussed is the brand new id mapping performance.

    The id mapping carrier is required to map the credentials of yet another protocol, corresponding to SASL DIGEST-MD5 and GSSAPI to a DN within the directory server. As you are going to see in right here instance, the id mapping feature makes use of the entries within the cn=id mapping, cn=config configuration branch, whereby each protocol is described and whereby each and every protocol have to perform the identity mapping. For more counsel on the identification mapping characteristic, seek advice from the sun ONE directory Server 5.2 documents.

    To perform the GSSAPI Configuration for the sun ONE directory Server software
  • assess and determine, with the aid of retrieving the rootDSE entry, that the GSSAPI is lower back as probably the most supported SASL Mechanisms.

    example of using ldapsearch to retrieve the rootDSE and get the supported SASL mechanisms:

    $./ldapsearch -h directoryserver_hostname -p ldap_port -b "" -s base "(objectclass=*)" supportedSASLMechanisms supportedSASLMechanisms=external supportedSASLMechanisms=GSSAPI supportedSASLMechanisms=DIGEST-MD5
  • check that the GSSAPI mechanism is enabled.

    via default, the GSSAPI mechanism is enabled.

    example of the use of ldapsearch to verify that the GSSAPI SASL mechanism is enabled:

    $./ldapsearch -h directoryserver_hostname -p ldap_port -D"cn=listing manager" -w password -b "cn=SASL, cn=protection,cn= config" "(objectclass=*)" # # may still return # cn=SASL, cn=safety, cn=config objectClass=properly objectClass=nsContainer objectClass=dsSaslConfig cn=SASL dsSaslPluginsPath=/var/solar/mps/lib/sasl dsSaslPluginsEnable=DIGEST-MD5 dsSaslPluginsEnable=GSSAPI
  • Create and add the GSSAPI identification-mapping.ldif.

    Add the LDIF proven beneath to the sun ONE listing Server so that it includes the suitable suffix to your listing server.

    You deserve to do that as a result of by default, no GSSAPI mappings are described in the solar ONE listing Server 5.2 utility.

    illustration of a GSSAPI identification mapping LDIF file:

    # dn: cn=GSSAPI,cn=identity mapping,cn=config objectclass: nsContainer objectclass: idealcn: GSSAPI dn: cn=default,cn=GSSAPI,cn=identification mapping,cn=config objectclass: dsIdentityMapping objectclass: nsContainer objectclass: bestcn: default dsMappedDN: uid=$main,ou=individuals,dc=example,dc=com dn: cn=same_realm,cn=GSSAPI,cn=identity mapping,cn=config objectclass: dsIdentityMapping objectclass: dsPatternMatching objectclass: nsContainer objectclass: bestcn: same_realm dsMatching-pattern: $primary dsMatching-regexp: (.*)@illustration.com dsMappedDN: uid=$1,ou=individuals,dc=example,dc=com

    it's important to utilize the $important variable, since it is the most effective enter you have from SASL within the case of GSSAPI. both you deserve to construct a dn the use of the $most important variable otherwise you deserve to perform sample matching to peer in case you can apply a specific mapping. A important corresponds to the identification of a consumer in Kerberos.

    you can find an instance GSSAPI LDIF mappings info in ServerRoot/slapdserver/ldif/identityMapping_Examples.ldif.

    here is an example the use of ldapmodify to try this:

    $./ldapmodify -a -c -h directoryserver_hostname -p ldap_port -D "cn=listing supervisor" -w password -f id-mapping.ldif -e /var/tmp/ldif.rejects 2> /var/tmp/ldapmodify.log
  • perform a verify the usage of ldapsearch.

    To perform this test, class right here ldapsearch command as shown beneath, and answer the immediate with the kinit cost you in the past defined.

    example of the use of ldapsearch to look at various the GSSAPI mechanism:

    $./ldapsearch -h directoryserver_hostname -p ldap_port -o mech=GSSAPI -o authzid="root/hostname.domainname@instance.COM" -b "" -s base "(objectclass=*)"

    The output this is returned should be the equal as devoid of the -o alternative.

    in case you do not use the -h hostname option, the GSS code finally ends up attempting to find a localhost.domainname Kerberos ticket, and an error occurs.

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