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• Definition: IBM Mainframe Password Management involves the mechanisms and tools used to securely store, manage, and authenticate user passwords on an IBM Mainframe system, typically running operating systems like z/OS.
• Function: Ensures that user passwords are stored securely, allows users to manage their passwords, and facilitates authentication for system access and services.
• Components:

   * '''RACF (Resource Access Control Facility)''': A security management product that provides authentication and authorization services.
   * '''ACF2 (Access Control Facility 2)''': Another security system that manages access control and authentication.
   * '''Top Secret''': A security product that provides comprehensive security and access control.
   * '''Password Management Tools''': Utilities and commands within the mainframe environment for managing user passwords.

• Features:

   * '''Password Encryption''': Uses strong encryption to secure passwords stored in the security databases.
   * '''Password Policies''': Enforce rules such as minimum length, complexity, and expiration periods through security products like RACF, ACF2, and Top Secret.
   * '''Password Management Tools''': Provide commands and interfaces for users and administrators to change passwords, set expiration dates, and configure password policies.
   * '''Authentication Mechanisms''': Integrates with various authentication methods, including multi-factor authentication and LDAP.

• Usage: Critical for system security, ensuring that only authorized users can access the system and its resources.

• Changing a user's password in RACF:

   ```JCL
   //PASSWORD JOB (ACCT#),'CHANGE PW',CLASS=A,MSGCLASS=A
   //S1 EXEC PGM=IKJEFT01
   //SYSTSPRT DD SYSOUT=*
   //SYSTSIN  DD *
   ALU  PASSWORD()
   /*
   ```

• Setting password policies in RACF:

   ```JCL
   //POLICY JOB (ACCT#),'SET POLICY',CLASS=A,MSGCLASS=A
   //S1 EXEC PGM=IKJEFT01
   //SYSTSPRT DD SYSOUT=*
   //SYSTSIN  DD *
   SETR PASSWORD(MINCHANGE(1) MINLEN(8) MIXEDCASE)
   /*
   ```

• Managing passwords with ACF2:

   * Change a password:
     ```JCL
     //PASSWORD JOB (ACCT#),'CHANGE PW',CLASS=A,MSGCLASS=A
     //S1 EXEC PGM=ACF
     //SYSPRINT DD SYSOUT=*
     //SYSIN    DD *
     CHANGE  PSWD()
     /*
     ```

• IBM Mainframe Password Management: Involves securely storing, managing, and authenticating user passwords using tools and mechanisms like RACF, ACF2, and Top Secret, with strong encryption and comprehensive password policies to ensure system security.