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Test Number : 000-886
Test Name : IBM Tivoli Monitoring v5.1.1 to v5.1.2 Implementation
Vendor Name : IBM
Q&A : 152 Dumps Questions

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

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

This chapter is from the ebook 

This area discusses the GSSAPI mechanism, in selected, Kerberos v5 and the way this works in conjunction with the sun ONE directory Server 5.2 application and what is involved in imposing such an answer. Please be conscious that here is no longer a trivial assignment.

It’s worth taking a brief appear at the relationship between the familiar security capabilities utility application Interface (GSSAPI) and Kerberos v5.

The GSSAPI doesn't basically supply protection services itself. somewhat, it is a framework that provides security capabilities to callers in a general style, with a number underlying mechanisms and applied sciences such as Kerberos v5. The latest implementation of the GSSAPI handiest works with the Kerberos v5 security mechanism. The most excellent technique to feel in regards to the relationship between GSSAPI and Kerberos is in right here manner: GSSAPI is a community authentication protocol abstraction that permits Kerberos credentials for use in an authentication alternate. Kerberos v5 ought to be installed and working on any device on which GSSAPI-conscious courses are working.

The support for the GSSAPI is made viable in the listing server throughout the introduction of a new SASL library, which is according to the Cyrus CMU implementation. through this SASL framework, DIGEST-MD5 is supported as defined prior to now, and GSSAPI which implements Kerberos v5. additional GSSAPI mechanisms do exist. as an instance, GSSAPI with SPNEGO support can be GSS-SPNEGO. different GSS mechanism names are in line with the GSS mechanisms OID.

The sun ONE listing Server 5.2 application handiest supports using GSSAPI on Solaris OE. There are implementations of GSSAPI for other operating techniques (for instance, Linux), but the solar ONE directory Server 5.2 software does not use them on structures aside from the Solaris OE.

realizing GSSAPI

The accepted safety capabilities utility software Interface (GSSAPI) is a standard interface, defined by means of RFC 2743, that gives a usual authentication and comfortable messaging interface, whereby these safety mechanisms can also be plugged in. essentially the most often observed GSSAPI mechanism is the Kerberos mechanism it is in response to secret key cryptography.

probably the most leading elements of GSSAPI is that it enables developers so as to add comfortable authentication and privacy (encryption and or integrity checking) coverage to statistics being omitted the wire by means of writing to a single programming interface. here's proven in determine three-2.

03fig02.giffigure 3-2. GSSAPI Layers

The underlying protection mechanisms are loaded on the time the classes are done, as hostile to when they are compiled and developed. In observe, probably the most commonplace GSSAPI mechanism is Kerberos v5. The Solaris OE offers a number of diverse flavors of Diffie-Hellman GSSAPI mechanisms, which can be best advantageous to NIS+ purposes.

What will also be confusing is that developers might write functions that write at once to the Kerberos API, or they may write GSSAPI purposes that request the Kerberos mechanism. there is a large difference, and purposes that talk Kerberos directly cannot communicate with people who talk GSSAPI. The wire protocols don't seem to be compatible, notwithstanding the underlying Kerberos protocol is in use. An example is telnet with Kerberos is a at ease telnet application that authenticates a telnet consumer and encrypts statistics, together with passwords exchanged over the network all over the telnet session. The authentication and message protection points are supplied the use of Kerberos. The telnet software with Kerberos handiest makes use of Kerberos, which is in keeping with secret-key technology. although, a telnet program written to the GSSAPI interface can use Kerberos in addition to different security mechanisms supported by using GSSAPI.

The Solaris OE doesn't bring any libraries that provide guide for third-celebration businesses to software without delay to the Kerberos API. The goal is to encourage builders to make use of the GSSAPI. Many open-supply Kerberos implementations (MIT, Heimdal) enable clients to write down Kerberos functions at once.

On the wire, the GSSAPI is compatible with Microsoft’s SSPI and as a result GSSAPI purposes can communicate with Microsoft functions that use SSPI and Kerberos.

The GSSAPI is favourite because it is a standardized API, whereas Kerberos isn't. This capability that the MIT Kerberos building group might change the programming interface each time, and any purposes that exist nowadays may no longer work sooner or later without some code changes. the use of GSSAPI avoids this difficulty.

one other benefit of GSSAPI is its pluggable feature, which is a huge benefit, in particular if a developer later decides that there is a far better authentication system than Kerberos, since it can readily be plugged into the gadget and the current GSSAPI functions should be capable of use it devoid of being recompiled or patched in any way.

realizing Kerberos v5

Kerberos is a network authentication protocol designed to provide mighty authentication for client/server purposes by using secret-key cryptography. at the beginning developed at the Massachusetts Institute of know-how, it is covered in the Solaris OE to deliver mighty authentication for Solaris OE network purposes.

moreover presenting a secure authentication protocol, Kerberos also presents the capability so as to add privacy support (encrypted information streams) for remote functions comparable to telnet, ftp, rsh, rlogin, and other typical UNIX community applications. within the Solaris OE, Kerberos can also be used to supply strong authentication and privacy guide for network File methods (NFS), allowing comfortable and personal file sharing across the community.

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

The Kerberos application is obtainable for Solaris OE models 2.6, 7, 8, and 9 in a separate package referred to as the solar commercial enterprise Authentication Mechanism (SEAM) software. For Solaris 2.6 and Solaris 7 OE, sun enterprise Authentication Mechanism application is blanketed as part of the Solaris convenient entry Server 3.0 (Solaris SEAS) equipment. For Solaris eight OE, the sun business Authentication Mechanism utility equipment is available with the Solaris 8 OE Admin Pack.

For Solaris 2.6 and Solaris 7 OE, the sun commercial enterprise Authentication Mechanism utility is freely accessible as a part of the Solaris easy access Server 3.0 equipment attainable for download from:


For Solaris eight OE methods, solar business Authentication Mechanism software is accessible in the Solaris eight OE Admin Pack, purchasable for download from:

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

For Solaris 9 OE techniques, sun business Authentication Mechanism software is already put in by way of default and contains the following applications listed in table three-1.

desk 3-1. Solaris 9 OE Kerberos v5 programs

kit name



Kerberos v5 KDC (root)


Kerberos v5 master KDC (consumer)


Kerberos version 5 aid (Root)


Kerberos edition 5 support (Usr)


Kerberos edition 5 assist (Usr) (sixty four-bit)

All of these solar business Authentication Mechanism application distributions are in response to the MIT KRB5 liberate edition 1.0. The client courses in these distributions are appropriate with later MIT releases (1.1, 1.2) and with different implementations which are compliant with the typical.

How Kerberos Works

right here is a top level view of the Kerberos v5 authentication equipment. From the consumer’s standpoint, Kerberos v5 is normally invisible after the Kerberos session has been all started. Initializing a Kerberos session regularly involves no greater than logging in and presenting a Kerberos password.

The Kerberos gadget revolves across the theory of a ticket. A ticket is a group of digital tips that serves as identification for a user or a service such as the NFS carrier. simply as your driver’s license identifies you and shows what using permissions you've got, so a ticket identifies you and your community entry privileges. in case you function a Kerberos-based transaction (for instance, in case you use rlogin to log in to a different desktop), your gadget transparently sends a request for a ticket to a Key Distribution middle, or KDC. The KDC accesses a database to authenticate your identity and returns a ticket that delivers you permission to access the different computing device. Transparently capability that you simply do not deserve to explicitly request a ticket.

Tickets have definite attributes linked to them. as an example, a ticket can also be forwardable (which capability that it may also be used on another laptop with out a new authentication system), or postdated (no longer valid except a precise time). How tickets are used (as an example, which clients are allowed to gain which kinds of tickets) is determined by guidelines which are determined when Kerberos is installed or administered.

you're going to often see the terms 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 makes it possible for for all subsequent authentications, and the subsequent authentications themselves.

a shopper (a person, or a service corresponding to NFS) starts a Kerberos session by way of inquiring for a ticket-granting ticket (TGT) from the important thing Distribution middle (KDC). This request is often achieved immediately at login.

A ticket-granting ticket is required to acquire different tickets for specific features. believe of the ticket-granting ticket as something corresponding to a passport. Like a passport, the ticket-granting ticket identifies you and permits you to achieve a large number of “visas,” where the “visas” (tickets) aren't for foreign countries, but for far off machines or network services. Like passports and visas, the ticket-granting ticket and the different a lot of tickets have constrained lifetimes. The difference is that Kerberized instructions note that you've a passport and procure the visas for you. You don’t ought to function the transactions your self.

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

Now in possession of a legitimate ticket-granting ticket, the customer can request tickets for all styles of community operations for provided that the ticket-granting ticket lasts. This ticket constantly lasts for a number of hours. each time the customer performs a distinct network operation, it requests a ticket for that operation from the KDC.

Subsequent Authentications

The client requests a ticket for a selected service from the KDC through sending the KDC its ticket-granting ticket as proof of id.

  • The KDC sends the ticket for the specific carrier to the customer.

    as an instance, suppose consumer lucy desires to entry an NFS file device that has been shared with krb5 authentication required. due to the fact she is already authenticated (it truly is, she already has a ticket-granting ticket), as she makes an attempt to entry the files, the NFS customer gadget instantly and transparently obtains a ticket from the KDC for the NFS provider.

  • The client sends the ticket to the server.

    When the use of the NFS carrier, the NFS client immediately and transparently sends the ticket for the NFS carrier 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, notwithstanding, because it registers itself with the KDC, just as the first client does.

  • Principals

    a shopper is recognized through its major. A major is a different identity to which the KDC can assign tickets. A primary will also be a person, equivalent to joe, or a carrier, comparable to NFS.

    by convention, a main identify is divided into three elements: the primary, the illustration, and the realm. a customary predominant may well be, for instance, lucy/admin@illustration.COM, the place:

    lucy is the fundamental. The basic may also be a consumer identify, as shown here, or a provider, corresponding to NFS. The primary can also be the note host, which signifies that this most important is a provider major it's install to supply a considerable number of network features.

    admin is the instance. An example is not obligatory in the case of user principals, nevertheless it is required for service principals. as an example, if the consumer lucy once in a while acts as a device administrator, she can use lucy/admin to differentiate herself from her common consumer identity. Likewise, if Lucy has accounts on two diverse hosts, she will use two primary names with diverse instances (as an instance, lucy/california.instance.com and lucy/boston.example.com).


    A realm is a logical community, corresponding to a domain, which defines a group of methods beneath the equal master KDC. Some nation-states are hierarchical (one realm being a superset of the different realm). in any other case, the nation-states are non-hierarchical (or direct) and the mapping between the two realms need to be defined.

    nation-states and KDC Servers

    every realm should include a server that continues the grasp replica of the main database. This server is known as the grasp KDC server. additionally, each realm should still comprise at least one slave KDC server, which carries replica copies of the important database. each the grasp KDC server and the slave KDC server create tickets that are used to establish authentication.

    realizing the Kerberos KDC

    The Kerberos Key Distribution middle (KDC) is a trusted server that issues Kerberos tickets to shoppers and servers to communicate securely. A Kerberos ticket is a block of statistics it is presented because the user’s credentials when making an attempt to entry a Kerberized carrier. A ticket contains suggestions concerning the user’s id and a short lived encryption key, all encrypted in the server’s deepest key. within the Kerberos environment, any entity it truly is described to have a Kerberos id is referred to as a primary.

    A main may be an entry for a particular person, host, or service (corresponding to NFS or FTP) that's to have interaction with the KDC. Most often, the KDC server gadget additionally runs the Kerberos Administration Daemon, which handles administrative instructions comparable to adding, deleting, and editing principals within the Kerberos database. typically, the KDC, the admin server, and the database are all on the identical computing device, however they can be separated if indispensable. Some environments may additionally require that multiple nation-states be configured with master KDCs and slave KDCs for each and every realm. The principals applied for securing every realm and KDC should be utilized to all realms and KDCs in the network to be sure that there isn’t a single vulnerable hyperlink in the chain.

    one of the first steps to take when initializing your Kerberos database is to create it the use of the kdb5_util command, which is discovered in /usr/sbin. When running this command, the consumer has the alternative of no matter if to create a stash file or no longer. The stash file is a local reproduction of the grasp key that resides on the KDC’s local disk. The master key contained in the stash file is generated from the master password that the person enters when first growing the KDC database. The stash file is used to authenticate the KDC to itself automatically before starting the kadmind and krb5kdc daemons (as an example, as a part of the machine’s boot sequence).

    If a stash file is not used when the database is created, the administrator who starts up the krb5kdc system will ought to manually enter the master key (password) every time they start the method. This may appear to be a regular exchange off between comfort and protection, but if the rest of the device is sufficiently hardened and guarded, very little safety is misplaced by having the grasp key saved in the covered stash file. it is counseled that at least one slave KDC server be put in for every realm to be sure that a backup is accessible in the event that the grasp server turns into unavailable, and that slave KDC be configured with the identical degree of protection as the grasp.

    at the moment, the solar Kerberos v5 Mechanism utility, kdb5_util, can create three kinds 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 check with the checksum algorithm it really is used. by default, the key created will be DES-CBC-CRC, which is the default encryption classification for the KDC. The category of key created is distinctive on the command line with the -ok option (see the kdb5_util (1M) man page). choose the password to your stash file very carefully, as a result of this password will also be used in the future to decrypt the grasp key and adjust the database. The password can be as much as 1024 characters lengthy and may include any combination of letters, numbers, punctuation, and spaces.

    right here is an instance of creating a stash file:

    kdc1 #/usr/sbin/kdb5_util create -r illustration.COM -s Initializing database '/var/krb5/primary' for realm 'illustration.COM' grasp key identify 'k/M@instance.COM' You should be induced for the database grasp Password. it's vital that you just no longer overlook this password. Enter KDC database master key: master_key Re-enter KDC database grasp key to investigate: master_key

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

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

    The listing used to keep the stash file and the database should still no longer be shared or exported.

    comfy Settings in the KDC Configuration File

    The KDC and Administration daemons both read configuration tips from /and so forth/krb5/kdc.conf. This file contains KDC-particular parameters that govern normal behavior for the KDC and for particular realms. The parameters within the kdc.conf file are defined in detail in the kdc.conf(4) man web page.

    The kdc.conf parameters describe areas of quite a lot of information and ports to make use of for getting access to the KDC and the administration daemon. These parameters often don't should be modified, and doing so doesn't outcome in any delivered protection. although, there are some parameters that could be adjusted to raise the average safety of the KDC. right here are some examples of adjustable parameters that boost safety.

  • kdc_ports – Defines the ports that the KDC will hear on to receive requests. The ordinary port for Kerberos v5 is 88. 750 is blanketed and familiar to aid older shoppers that still use the default port distinctive for Kerberos v4. Solaris OE nevertheless listens on port 750 for backwards compatibility. this is no longer considered a security risk.

  • max_life – Defines the optimum lifetime of a ticket, and defaults to eight hours. In environments where it is eye-catching to have users re-authenticate commonly and to cut back the chance of having a major’s credentials stolen, this price should be diminished. The recommended value is eight hours.

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

  • default_principal_expiration – A Kerberos fundamental is any wonderful id to which Kerberos can assign a ticket. in the case of clients, it is a similar because the UNIX gadget user identify. The default lifetime of any most important in the realm can be defined within the kdc.conf file with this choice. This may still be used most effective if the realm will include temporary principals, in any other case the administrator will need to continually be renewing principals. constantly, this atmosphere is left undefined and principals do not expire. here is now not insecure so long as the administrator is vigilant about doing away with principals for users that now not want entry to the programs.

  • supported_enctypes – The encryption kinds supported by the KDC could be described with this choice. at the moment, sun business Authentication Mechanism utility best helps des-cbc-crc:average encryption classification, but sooner or later this can be used to make certain that only robust cryptographic ciphers are used.

  • dict_file – The place of a dictionary file containing strings that aren't allowed as passwords. A foremost with any password policy (see beneath) aren't in a position to use words found in this dictionary file. here's no longer defined via default. the use of a dictionary file is a great way to evade users from creating trivial passwords to provide protection to their bills, and consequently helps steer clear of one of the most average weaknesses in a computer network-guessable passwords. The KDC will most effective verify passwords towards the dictionary for principals which have a password policy affiliation, so it's good observe to have at the least one primary policy associated with all principals within the realm.

  • The Solaris OE has a default device dictionary it is used by way of the spell application that may additionally also be used with the aid of the KDC as a dictionary of standard passwords. The area of this file is: /usr/share/lib/dict/phrases. other dictionaries can be substituted. The format is one word or phrase per line.

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

    # Copyright 1998-2002 solar Microsystems, Inc. All rights reserved. # Use is area to license terms. # #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/fundamental admin_keytab = /and many others/krb5/kadm5.keytab acl_file = /and so forth/krb5/kadm5.acl kadmind_port = 749 max_life = 8h 0m 0s max_renewable_life = 7d 0h 0m 0s default_principal_flags = +preauth needs moving -- dict_file = /usr/share/lib/dict/words access manage

    The Kerberos administration server enables for granular handle of the executive instructions by way of use of an entry handle listing (ACL) file (/etc/krb5/kadm5.acl). The syntax for the ACL file permits for wildcarding of major names so it isn't quintessential to checklist every single administrator within the ACL file. This function should still be used with amazing care. The ACLs used via Kerberos enable privileges to be damaged down into very specific features that each administrator can function. If a undeniable administrator most effective needs to be allowed to have study-entry to the database then that person should still not be granted full admin privileges. below is a list of the privileges allowed:

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

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

  • d – allows the deletion of principals or policies within the database.

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

  • m – allows for the amendment of principals or policies in the database.

  • M – Prohibits the amendment of principals or guidelines in the database.

  • c – permits the altering of passwords for principals in the database.

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

  • i – enables inquiries to the database.

  • I – Prohibits inquiries to the database.

  • l – permits the listing of principals or policies in the database.

  • L – Prohibits the list of principals or policies in the database.

  • * – brief for all privileges (admcil).

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

  • including administrators

    After the ACLs are set up, specific administrator principals may still be added to the device. it's strongly informed that administrative users have separate /admin principals to use handiest when administering the system. as an instance, person Lucy would have two principals in the database - lucy@REALM and lucy/admin@REALM. The /admin most important would most effective be used when administering the system, not for getting ticket-granting-tickets (TGTs) to access far flung features. using the /admin primary handiest for administrative purposes minimizes the opportunity of a person running as much as Joe’s unattended terminal and performing unauthorized administrative instructions on the KDC.

    Kerberos principals may well be differentiated via the instance part of their important identify. in the case of user principals, probably the most regular illustration identifier is /admin. it is ordinary apply in Kerberos to differentiate consumer principals by way 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 example identifier are assumed to have administrative privileges described in the ACL file and should best be used for administrative purposes. A fundamental with an /admin identifier which doesn't match up with any entries within the ACL file are not granted any administrative privileges, it may be treated as a non-privileged consumer primary. additionally, person principals with the /admin identifier are given separate passwords and separate permissions from the non-admin major for the same person.

    here is a pattern /and so forth/krb5/kadm5.acl file:

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

    it's highly informed that the kadm5.acl file be tightly controlled and that clients be granted simplest the privileges they should function their assigned tasks.

    creating Host Keys

    growing host keys for systems in the realm corresponding to slave KDCs is carried out the equal method that developing consumer principals is carried out. youngsters, the -randkey choice should at all times be used, so no person ever is aware of the exact key for the hosts. Host principals are almost always saved in the keytab file, for use by using root-owned approaches that need to act as Kerberos capabilities for the local host. it is rarely fundamental for any person to in reality know the password for a number important because the secret's saved safely within the keytab and is only available through root-owned approaches, never by using real users.

    When creating keytab information, the keys should still at all times be extracted from the KDC on the same desktop where the keytab is to reside the use of the ktadd command from a kadmin session. If this is no longer feasible, take superb care in transferring the keytab file from one computing device to the next. A malicious attacker who possesses the contents of the keytab file may use these keys from the file in an effort to gain access to a different user or functions credentials. Having the keys would then allow the attacker to impersonate some thing predominant that the important thing represented and additional compromise the safety of that Kerberos realm. Some information for transferring the keytab are to make use of Kerberized, encrypted ftp transfers, or to make use of the cozy file switch programs scp or sftp offered with the SSH equipment (http://www.openssh.org). an additional protected formulation is to area the keytab on a removable disk, and hand-convey it to the vacation spot.

    Hand delivery doesn't scale neatly for colossal installations, so the use of the Kerberized ftp daemon is possibly the most effortless and secure formula obtainable.

    the use of NTP to Synchronize Clocks

    All servers participating in the Kerberos realm should have their gadget clocks synchronized to within a configurable cut-off date (default 300 seconds). The most secure, most comfy approach to systematically synchronize the clocks on a network of Kerberos servers is through the use of the network Time Protocol (NTP) service. The Solaris OE comes with an NTP client and NTP server software (SUNWntpu package). See the ntpdate(1M) and xntpd(1M) man pages for more guidance on the individual commands. For extra guidance on configuring NTP, seek advice from the following solar BluePrints on-line NTP articles:

    it is important that the time be synchronized in a comfortable manner. an easy denial of provider assault on either a shopper or a server would involve simply skewing the time on that gadget to be backyard of the configured clock skew value, which might then steer clear of any person from acquiring TGTs from that device or accessing Kerberized services on that system. The default clock-skew price of 5 minutes is the highest counseled value.

    The NTP infrastructure should also be secured, including the use of server hardening for the NTP server and utility of NTP safety elements. the usage of the Solaris safety Toolkit application (previously called JASS) with the at ease.driver script to create a minimal gadget after which installation just the fundamental NTP utility is one such formulation. The Solaris security Toolkit software is accessible at:


    Documentation on the Solaris security Toolkit utility is purchasable at:


    organising Password guidelines

    Kerberos enables the administrator to define password policies that can also be applied to a few or all of the person principals in the realm. A password policy carries definitions for the following parameters:

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

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

  • Saved Password heritage – The variety of previous passwords that have been used via the fundamental that can't be reused. The recommended price is 3.

  • minimal Password Lifetime (seconds) – The minimal time that the password need to be used before it can also be modified. The advised price is 3600 (1 hour).

  • optimum Password Lifetime (seconds) – The optimum time that the password will also be used before it should be modified. The recommended cost is 7776000 (90 days).

  • These values can be set as a group and saved as a single coverage. distinct guidelines may also be described for diverse principals. it's suggested that the minimum password length be set to as a minimum 8 and that at the least 2 courses be required. Most individuals tend to opt for effortless-to-be aware and easy-to-classification passwords, so it's a good suggestion to at least install guidelines to encourage a bit extra complex-to-wager passwords by utilizing these parameters. setting the maximum Password Lifetime price can be valuable in some environments, to force people to change their passwords periodically. The length is up to the native administrator according to the overriding company security coverage used at that specific web page. surroundings the Saved Password history value combined with the minimum Password Lifetime value prevents individuals from readily switching their password a couple of times unless they get again to their common or favorite password.

    The maximum password length supported is 255 characters, in contrast to the UNIX password database which handiest helps as much as eight characters. Passwords are stored in the KDC encrypted database using the KDC default encryption system, DES-CBC-CRC. to be able to keep away from password guessing assaults, it is informed that clients opt for long passwords or move phrases. The 255 persona restrict allows for one to choose a small sentence or handy to remember phrase in its place of a simple one-notice password.

    it is viable to use a dictionary file that will also be used to steer clear of users from settling on typical, convenient-to-wager phrases (see “cozy Settings in the KDC Configuration File” on web page 70). The dictionary file is only used when a fundamental has a policy affiliation, so it is extremely counseled that at the least one policy be in effect for all principals within the realm.

    the following is an instance password coverage advent:

    in case you specify a kadmin command devoid of specifying any alternatives, kadmin displays the syntax (utilization counsel) for that command. right here code container shows this, followed through 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 eight -minclasses 2 -heritage three passpolicy kadmin: get_policy passpolicy coverage: passpolicy highest password life: 7776000 minimum password life: 3600 minimum password length: eight minimal number of password personality classes: 2 number of old keys saved: 3 Reference count: 0

    This illustration creates a password coverage called passpolicy which enforces a optimum password lifetime of ninety days, minimum size of eight characters, at the least 2 distinct persona classes (letters, numbers, punctuation), and a password background of 3.

    To apply this coverage to an current consumer, modify here:

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

    To alter the default policy this is applied to all user principals in a realm, change right here:

    kadmin: modify_policy -maxlife "ninety days" -minlife "1 hour" -minlength eight -minclasses 2 -background three default kadmin: get_policy default policy: default highest password existence: 7776000 minimal password existence: 3600 minimum password length: 8 minimal variety of password personality classes: 2 variety of ancient keys saved: 3 Reference count: 1

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

    The default policy is instantly applied to all new principals that aren't given the equal password as the fundamental identify when they are created. Any account with a coverage assigned to it's makes use of the dictionary (defined within the dict_file parameter in /and so on/krb5/kdc.conf) to assess for usual passwords.

    Backing Up a KDC

    Backups of a KDC equipment should still be made always or in keeping with native coverage. despite the fact, backups should still exclude the /and so on/krb5/krb5.keytab file. If the local policy requires that backups be carried out over a network, then these backups should still be secured either through the use of encryption or possibly by using a separate network interface that is barely used for backup functions and is not exposed to the same site visitors as the non-backup network traffic. Backup storage media may still all the time be kept in a at ease, fireproof region.

    Monitoring the KDC

    once the KDC is configured and working, it's going to be always and vigilantly monitored. The sun Kerberos v5 utility KDC logs guidance into the /var/krb5/kdc.log file, but this region can also be modified within the /etc/krb5/krb5.conf file, in the logging section.

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

    The KDC log file may still have read and write permissions for the basis consumer simplest, as follows:

    -rw------ 1 root different 750 25 may also 10 17:55 /var/krb5/kdc.log Kerberos alternatives

    The /and many others/krb5/krb5.conf file carries counsel that all Kerberos purposes use to assess what server to talk to and what realm they are collaborating in. Configuring the krb5.conf file is covered within the solar enterprise Authentication Mechanism utility setting up book. additionally consult with the krb5.conf(4) man web page for a full description of this file.

    The appdefaults section within the krb5.conf file incorporates parameters that control the conduct of many Kerberos customer tools. each and every tool may also have its personal section within the appdefaults component of the krb5.conf file.

    most of the applications that use the appdefaults area, use the equal alternate options; despite the fact, they might be set in alternative ways for every client utility.

    Kerberos client applications

    the following Kerberos purposes can have their behavior modified through the consumer of options set within the appdefaults component of the /and so on/krb5/krb5.conf file or through the use of quite a lot of command-line arguments. These customers and their configuration settings are described below.


    The kinit client is used by means of americans who need to reap a TGT from the KDC. The /and so on/krb5/krb5.conf file supports the following kinit alternate options: renewable, forwardable, no_addresses, max_life, max_renewable_life and proxiable.


    The Kerberos telnet customer has many command-line arguments that manage its habits. refer to the man page for complete information. despite the fact, there are a number of interesting safety concerns involving the Kerberized telnet client.

    The telnet customer makes use of a session key even after the provider ticket which it changed into derived from has expired. This potential that the telnet session is still energetic even after the ticket firstly used to gain access, is not any longer valid. this is insecure in a strict environment, youngsters, the exchange off between ease of use and strict security tends to lean in favor of ease-of-use in this situation. it's informed that the telnet connection be re-initialized periodically by means of disconnecting and reconnecting with a brand new ticket. The general lifetime of a ticket is described by means of the KDC (/and many others/krb5/kdc.conf), continuously defined as eight hours.

    The telnet client makes it possible for the person to ahead a copy 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 alternative sends a non-forwardable replica of the local TGT to the far off equipment so that the consumer can entry Kerberized NFS mounts or other native Kerberized services on that gadget handiest. The -F choice sends a forwardable TGT to the remote system in order that the TGT can also be used from the far off equipment to gain additional entry to different far flung Kerberos functions beyond that element. The -F choice is a superset of -f. If the Forwardable and or ahead options are set to false within the krb5.conf file, these command-line arguments can be used to override those settings, for that reason giving people the handle over no matter if and how their credentials are forwarded.

    The -x choice may still be used to switch on encryption for the information circulate. This further protects the session from eavesdroppers. If the telnet server does not assist encryption, the session is closed. The /and many others/krb5/krb5.conf file helps here telnet options: forward, 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 person identify. The local consumer identify is passed on to the far off equipment within the telnet negotiations.

    rlogin and rsh

    The Kerberos rlogin and rsh purchasers behave tons the identical as their non-Kerberized equivalents. on account of this, it is suggested that if they are required to be blanketed in the community info equivalent to /and so forth/hosts.equiv and .rhosts that the root users directory be eliminated. The Kerberized models have the additional advantage of the use of Kerberos protocol for authentication and might also use Kerberos to offer protection to the privacy of the session the usage of encryption.

    akin to telnet described in the past, the rlogin and rsh purchasers use a session key after the carrier ticket which it turned into derived from has expired. for this reason, for optimum safety, rlogin and rsh periods should still be re-initialized periodically. rlogin uses the -f, -F, and -x alternatives in the identical style because the telnet customer. The /and so on/krb5/krb5.conf file helps the following rlogin alternate options: forward, forwardable, and encrypt.

    Command-line alternatives override configuration file settings. as an instance, if the rsh section within the krb5.conf file indicates encrypt false, but the -x option is used on the command line, an encrypted session is used.


    Kerberized rcp may also be used to switch data securely between techniques the usage of Kerberos authentication and encryption (with the -x command-line option). It does not instantaneous for passwords, the consumer should already have a sound TGT earlier than using rcp if they wish to use the encryption characteristic. however, beware if the -x option isn't used and no local credentials can be found, the rcp session will revert to the commonplace, non-Kerberized (and insecure) rcp behavior. it's particularly recommended that clients all the time use the -x alternative when the usage of the Kerberized rcp client.The /and many others/krb5/krb5.conf file helps the encrypt [true/false] alternative.


    The Kerberos login program (login.krb5) is forked from a a success authentication by way 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 consequently, the normal Solaris OE points similar to BSM auditing are not yet supported when using this daemon. The /and so on/krb5/krb5.conf file helps the krb5_get_tickets [true/false] option. If this alternative is decided to true, then the login application will generate a brand new Kerberos ticket (TGT) for the consumer upon correct authentication.


    The solar commercial enterprise Authentication Mechanism (SEAM) edition of the ftp client uses the GSSAPI (RFC 2743) with Kerberos v5 as the default mechanism. This capacity that it uses Kerberos authentication and (optionally) encryption in the course of the Kerberos v5 GSS mechanism. The best Kerberos-connected command-line alternate options are -f and -m. The -f option is an identical as described above for telnet (there isn't any want for a -F alternative). -m allows for the consumer to specify an option GSS mechanism in that case desired, the default is to make use of the kerberos_v5 mechanism.

    The insurance plan level used for the information switch can also be set using the protect command on the ftp instantaneous. sun commercial enterprise Authentication Mechanism utility ftp supports right here coverage ranges:

  • Clear unprotected, unencrypted transmission

  • secure statistics is integrity included the usage of cryptographic checksums

  • inner most facts is transmitted with confidentiality and integrity using encryption

  • it is counseled that clients set the coverage degree to inner most for all statistics transfers. The ftp customer software doesn't assist or reference the krb5.conf file to discover any non-compulsory parameters. All ftp client alternate options are passed on the command line. See the person page for the Kerberized ftp customer, ftp(1).

    In summary, adding Kerberos to a community can increase the universal security attainable to the users and administrators of that community. far off classes may also be securely authenticated and encrypted, and shared disks can also be secured and encrypted across the community. furthermore, Kerberos allows for the database of person and repair principals to be managed securely from any desktop which helps the SEAM software Kerberos protocol. SEAM is interoperable with other RFC 1510 compliant Kerberos implementations similar to MIT Krb5 and a few MS home windows 2000 energetic listing functions. Adopting the practices recommended in this area further relaxed the SEAM software infrastructure to support make certain a safer network atmosphere.

    imposing the sun ONE directory Server 5.2 software and the GSSAPI Mechanism

    This section provides a high-level overview, followed by way of the in-depth tactics that describe the setup fundamental to put into effect the GSSAPI mechanism and the solar ONE directory Server 5.2 application. This implementation assumes a realm of illustration.COM for this goal. here list offers an preliminary high-stage overview of the steps required, with the subsequent area presenting the distinctive assistance.

  • Setup DNS on the client desktop. this is an important step as a result of Kerberos requires DNS.

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

  • check that the directory server and client each have the SASL plug-ins installed.

  • deploy and configure Kerberos v5.

  • Edit the /and so forth/krb5/krb5.conf file.

  • Edit the /and so on/krb5/kdc.conf file.

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

  • movement the kerberos_v5 line so it is the first line within the /and so forth/gss/mech file.

  • Create new principals the use of kadmin.local, which is an interactive commandline interface to the Kerberos v5 administration device.

  • regulate the rights for /etc/krb5/krb5.keytab. This access is fundamental for the solar ONE listing Server 5.2 application.

  • Run /usr/sbin/kinit.

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

  • function an ldapsearch, the use of the ldapsearch command-line tool from the sun ONE directory Server 5.2 application to test and verify.

  • The sections that observe fill in the particulars.

    Configuring a DNS customer

    To be a DNS client, a laptop must run the resolver. The resolver is neither a daemon nor a single application. it's a collection of dynamic library routines used through applications that deserve to comprehend computing device names. The resolver’s function is to resolve clients’ queries. To do this, it queries a reputation server, which then returns either the requested guidance or a referral to one more server. once the resolver is configured, a laptop can request DNS carrier from a name server.

    right here illustration indicates you a way to configure the resolv.conf(four) file in the server kdc1 within the illustration.com area.

    ; ; /etc/resolv.conf file for dnsmaster ; domain illustration.com nameserver nameserver

    the primary line of the /and so on/resolv.conf file lists the domain identify within the form:

    domain domainname

    No areas or tabs are approved at the end of the area name. make sure that you just press return instantly after the ultimate personality of the domain identify.

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

    nameserver IP_address

    Succeeding lines listing the IP addresses of 1 or two slave or cache-simplest name servers that the resolver should still check with to resolve queries. name server entries have the kind:

    nameserver IP_address

    IP_address is the IP tackle of a slave or cache-most effective DNS identify server. The resolver queries these name servers in the order they are listed except it obtains the suggestions it needs.

    For extra distinctive suggestions of what the resolv.conf file does, refer to the resolv.conf(four) man page.

    To Configure Kerberos v5 (master KDC)

    in the this procedure, here configuration parameters are used:

  • Realm identify = illustration.COM

  • DNS domain name = illustration.com

  • grasp KDC = kdc1.illustration.com

  • admin essential = lucy/admin

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

  • This system requires that DNS is working.

    earlier than you start this configuration procedure, make a backup of the /and so forth/krb5 data.

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

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

    You should trade the realm names and the names of the servers. See the krb5.conf(4) man web page for a full description of this file.

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

    in this illustration, the lines for domain_realm, kdc, admin_server, and all domain_realm entries had been modified. moreover, the road with ___slave_kdcs___ within the [realms] area changed into deleted and the line that defines the help_url was edited.

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

    You must trade the realm name. See the kdc.conf( 4) man page for a full description of this file.

    kdc1 # more /etc/krb5/kdc.conf [kdcdefaults] kdc_ports = 88,750 [realms] illustration.COM= profile = /and so forth/krb5/krb5.conf database_name = /var/krb5/major admin_keytab = /and many others/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 relocating ---------> default_principal_flags = +preauth

    in this instance, best the realm name definition within the [realms] section is changed.

  • Create the KDC database by using the kdb5_util command.

    The kdb5_util command, which is discovered in /usr/sbin, creates the KDC database. When used with the -s alternative, this command creates a stash file it truly is used to authenticate the KDC to itself earlier than the kadmind and krb5kdc daemons are all started.

    kdc1 # /usr/sbin/kdb5_util create -r illustration.COM -s Initializing database '/var/krb5/primary' for realm 'example.COM' grasp key name 'k/M@example.COM' You might be prompted for the database grasp Password. it's important that you just no longer forget this password. Enter KDC database grasp key: key Re-enter KDC database master key to assess: key

    The -r option followed by way of the realm identify isn't required if the realm name is similar to the domain identify within the server’s name area.

  • Edit the Kerberos access handle record file (kadm5.acl).

    once populated, the /etc/krb5/kadm5.acl file carries all predominant names which are allowed to administer the KDC. the first entry that is brought could appear corresponding to here:

    lucy/admin@instance.COM *

    This entry offers the lucy/admin foremost in the instance.COM realm the capability to adjust principals or guidelines in the KDC. The default installation comprises an asterisk (*) to in shape all admin principals. This default generally is a safety possibility, so it is more at ease to include a list of the entire admin principals. See the kadm5.acl(four) man web page for more information.

  • Edit the /and many others/gss/mech file.

    The /and so forth/gss/mech file consists of the GSSAPI based mostly safety mechanism names, its object identifier (OID), and a shared library that implements the services for that mechanism below the GSSAPI. exchange right here from:

    # Mechanism name Object Identifier Shared Library Kernel Module # diffie_hellman_640_0 1.three.6.four.1.forty two. 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 dh640-0.so.1 diffie_hellman_1024_0 two. dh1024-0.so.1
  • Run the kadmin.native command to create principals.

    you could add as many admin principals as you want. but you must add at the least one admin predominant to comprehensive the KDC configuration manner. In here illustration, lucy/admin is introduced as the main.

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

    right here command sequence creates a special keytab file with fundamental entries for lucy and tom. These principals are necessary for the kadmind carrier. moreover, that you could optionally add NFS provider principals, host principals, LDAP principals, and so forth.

    When the primary example is a host identify, the completely qualified area name (FQDN) must be entered in lowercase letters, despite the case of the domain identify within the /and many others/resolv.conf file.

    kadmin.local: ktadd -ok /and many others/krb5/kadm5.keytab kadmin/kdc1.illustration.com Entry for fundamental kadmin/kdc1.example.com with kvno 3, encryption category DES-CBC-CRC delivered to keytab WRFILE:/and many others/krb5/kadm5.keytab. kadmin.local: ktadd -okay /and many others/krb5/kadm5.keytab changepw/kdc1.instance.com Entry for foremost changepw/kdc1.example.com with kvno three, encryption category DES-CBC-CRC added to keytab WRFILE:/etc/krb5/kadm5.keytab. kadmin.local:

    once you have introduced all the required principals, that you would be able to exit from kadmin.native as follows:

    kadmin.local: stop
  • beginning the Kerberos daemons as proven:

    kdc1 # /and so forth/init.d/kdc start kdc1 # /etc/init.d/kdc.grasp delivery


    You stop the Kerberos daemons via working the following commands:

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

    To do that, you ought to go online with probably the most admin foremost names that you simply created previous during this process. youngsters, here command-line example is proven for simplicity.

    kdc1 # /usr/sbin/kadmin -p lucy/admin Enter password: kws_admin_password kadmin:
  • Create the master KDC host essential which is used by using Kerberized purposes similar to klist and kprop.

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

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

    kadmin: ktadd host/kdc1.illustration.com kadmin: Entry for important host/kdc1.illustration.com with ->kvno three, encryption category DES-CBC-CRC introduced to keytab ->WRFILE:/and many others/krb5/krb5.keytab kadmin:

    once you have delivered the entire required principals, that you may exit from kadmin as follows:

    kadmin: provide up
  • Run the kinit command to attain and cache an preliminary ticket-granting ticket (credential) for the fundamental.

    This ticket is used for authentication through the Kerberos v5 device. kinit best must be run by the client at the present. If the sun ONE listing server have been a Kerberos client also, this step would need to be completed for the server. although, you may also want to use this to check that Kerberos is up and operating.

    kdclient # /usr/bin/kinit root/kdclient.example.com Password for root/kdclient.instance.com@example.COM: passwd
  • verify and examine that you've got a ticket with the klist command.

    The klist command stories if there's a keytab file and displays the principals. If the consequences reveal that there is no keytab file or that there is no NFS service essential, you deserve to check the completion of the entire previous steps.

    # klist -ok Keytab name: FILE:/and many others/krb5/krb5.keytab KVNO predominant ---- ------------------------------------------------------------------ 3 nfs/host.example.com@instance.COM

    The illustration given here assumes a single domain. The KDC may also stay on the same laptop because the sun ONE directory server for testing purposes, however there are protection considerations to take into consideration on the place the KDCs stay.

  • related to the configuration of Kerberos v5 at the side of the sun ONE listing Server 5.2 utility, you are finished with the Kerberos v5 part. It’s now time to study what's required to be configured on the sun ONE directory server aspect.

    solar ONE listing Server 5.2 GSSAPI Configuration

    As up to now discussed, the prevalent security features application software Interface (GSSAPI), is ordinary interface that permits you to use a protection mechanism comparable to Kerberos v5 to authenticate consumers. The server uses the GSSAPI to really validate the identification of a selected consumer. once this person is validated, it’s up to the SASL mechanism to follow the GSSAPI mapping rules to achieve a DN that is the bind DN for all operations throughout the connection.

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

    The id mapping carrier is required to map the credentials of one other protocol, such as SASL DIGEST-MD5 and GSSAPI to a DN within the directory server. As you are going to see in here illustration, the identification mapping feature uses the entries in the cn=identity mapping, cn=config configuration branch, whereby each protocol is defined and whereby every protocol have to function the identification mapping. For greater tips on the identity mapping characteristic, seek advice from the solar ONE directory Server 5.2 documents.

    To operate the GSSAPI Configuration for the solar ONE directory Server utility
  • determine and assess, by retrieving the rootDSE entry, that the GSSAPI is again as one of the most supported SASL Mechanisms.

    example of the usage of 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
  • determine that the GSSAPI mechanism is enabled.

    through default, the GSSAPI mechanism is enabled.

    illustration of the usage of ldapsearch to investigate that the GSSAPI SASL mechanism is enabled:

    $./ldapsearch -h directoryserver_hostname -p ldap_port -D"cn=listing supervisor" -w password -b "cn=SASL, cn=safety,cn= config" "(objectclass=*)" # # should return # cn=SASL, cn=safety, cn=config objectClass=excellent objectClass=nsContainer objectClass=dsSaslConfig cn=SASL dsSaslPluginsPath=/var/sun/mps/lib/sasl dsSaslPluginsEnable=DIGEST-MD5 dsSaslPluginsEnable=GSSAPI
  • Create and add the GSSAPI identity-mapping.ldif.

    Add the LDIF shown beneath to the sun ONE listing Server in order that it incorporates the suitable suffix in your listing server.

    You need to try this because via default, no GSSAPI mappings are defined within the solar ONE listing Server 5.2 software.

    instance of a GSSAPI id mapping LDIF file:

    # dn: cn=GSSAPI,cn=identification mapping,cn=config objectclass: nsContainer objectclass: idealcn: GSSAPI dn: cn=default,cn=GSSAPI,cn=id mapping,cn=config objectclass: dsIdentityMapping objectclass: nsContainer objectclass: bestcn: default dsMappedDN: uid=$major,ou=individuals,dc=instance,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: (.*)@instance.com dsMappedDN: uid=$1,ou=americans,dc=illustration,dc=com

    it is important to make use of the $foremost variable, since it is the best enter you have from SASL within the case of GSSAPI. either you deserve to build a dn the use of the $main variable or you need to perform trial matching to look in case you can observe a particular mapping. A major corresponds to the identification of a user in Kerberos.

    that you can discover an illustration GSSAPI LDIF mappings information in ServerRoot/slapdserver/ldif/identityMapping_Examples.ldif.

    the following is an illustration using ldapmodify to do this:

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

    To function this look at various, classification the following ldapsearch command as proven under, and answer the instantaneous with the kinit price you prior to now defined.

    illustration of using ldapsearch to verify the GSSAPI mechanism:

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

    The output it's back should still be the identical as without the -o alternative.

    if you don't use the -h hostname alternative, the GSS code finally ends up looking for a localhost.domainname Kerberos ticket, and an error happens.

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