Download AIX and Linux Interoperabilty by IBM Redbooks, Abhijit Chavan, International Business PDF

By IBM Redbooks, Abhijit Chavan, International Business Machines Corporation

This IBM Redbook discusses interoperability by way of UNIX to UNIX pass platform info sharing and user/system administration. This redbook additionally demonstrates the similarities and adjustments among the AIX and Linux working structures.

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Chapter 2. Centralized user management 45 Though authconfig does a good job, it still cannot use multiple LDAP servers or SSL certificates. conf sample in Example 2-13 shows the changes in the last four lines. 0 # This file is auto-generated. # User changes will be destroyed the next time authconfig is run. pem tls_checkpeer yes pam_password crypt Incidentally, the AIX LDAP client connects to port 636 using LDAP over SSL, while the PAM LDAP client uses TLS on the standard LDAP TCP port (389). 7 Security considerations Centralized user management and authentication raise a few security concerns.

In this subsection, we will cover installation on a Linux platform. 0, most of the following procedure applies to any Linux distribution. Installation We need to install the following packages: openldap, openldap-clients, openldap-servers, and nss_ldap. In addition, the following packages are required: OpenSSL (openssl), Kerberos support (krb5-libs), and Cyrus SASL (cyrus-sasl and cyrus-sasl-md5). It is somewhat difficult to track the RPM dependencies, so this list may not be complete and may change in the future.

We illustrate the Linux security subsystem in Figure 2-6 on page 36. Chapter 2. 3 PAM and NSS LDAP modules on AIX The PAM LDAP module and AIX LDAP loadable authentication module authenticate users in very different ways. On the one hand, the PAM LDAP module authenticates users by trying to perform the LDAP bind operation as the given user. On the other hand, the AIX LDAP module (or, more precisely, the secldapclntd client side daemon) binds to the LDAP server as a privileged user, reads the user password, computes the hash of the user supplied password, and finally compares the two.

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