23
Tue, Apr
0 New Articles

Security Patrol

IBM i (OS/400, i5/OS)
Typography
  • Smaller Small Medium Big Bigger
  • Default Helvetica Segoe Georgia Times

Adopting Owner’s Authority

Question: To prevent the exposure resulting from a powerful user profile being used from any terminal, my company’s auditors requested that I set the system value QLMTSECOFR to ‘1’ to restrict where users with *ALLOBJ authority can sign on. But if I do, I will not be able to sign on at users’ workstations to assist with problems.

Some system values (QPWDEXPITV, QLMTDEVSSN) have a user profile override, but QLMTSECOFR doesn’t. How can I set this system value so that I can sign on at users’ workstations?

Answer: When you set the system value QLMTSECOFR to ‘1’, user profiles having either *ALLOBJ or *SERVICE special authority are restricted to signing on at the system console and at devices explicitly authorized to the user profile. If a device is authorized to the user profile QSECOFR, any *ALLOBJ user can sign on.

You could authorize your user profile to every device, but doing so would be tedious and defeat the intended purpose of this system value.

I recommend that you create a program owned by QSECOFR that adopts the owner’s authority and allows entry of commands. The program consists of a single command, CALL QCMD, which displays the command entry line. Name this program SECOFR, and authorize it to the users to whom you want to allow *ALLOBJ access. Then, change your user profile to remove *ALLOBJ authority. This method will allow you to sign on at any workstation when the system value QLMTSECOFR is set to ‘1’.

If you need security officer access, get it through the CALL SECOFR program. If you remove *ALLOBJ authority from your user profile and use CALL SECOFR only rarely, you’ll prevent accidental deletion or modification of objects.

These steps create the program SECOFR:
1. Create the program with adopted authority. CRTCLPGM PGM(your-lib/SECOFR) USRPRF(*OWNER) AUT(*EXCLUDE) SRCF(....)

2. Change the owner of the program to QSECOFR. CHGOBJOWN OBJ(your-lib/SECOFR) OBJTYPE(*PGM) TOUSER(QSECOFR)

3. Authorize the program to the user that should have *ALLOBJ access. GRTOBJAUT OBJ(your-lib/SECOFR) OBJTYPE(*PGM) USER(your-profile) AUT(*USE)

4. Change the system value QLMTSECOFR to ‘1’. CHGSYSVAL QLMTSECOFR ‘1’
5. Remove *ALLOBJ authority from user profiles. CHGUSRPRF USRPRF(profile) SPCAUT(.......).

Commands for All Users

Question: Most of our users are not allowed to enter commands. One user tells me that he can use the SIGNOFF command even though his user profile is limited capability, LMTCPB =*YES. Are there some commands that all users can enter?

Answer: The Limit capability (LMTCPB) option in the user profile prevents the use of commands unless the individual command attribute Allow limited user (ALWLMTUSR) contains the value *YES. Of course, the users must be authorized to the command in question.

The IBM default for commands does not allow command entry by any user whose user profile prevents use of commands.

The commands shipped by IBM with ALWLMTUSR=*YES are Display Job (DSPJOB), Display Job Log (DSPJOBLOG), Display Message (DSPMSG), Send Message (SNDMSG), Start PC Organizer (STRPCO), and SIGNOFF. Users are allowed to use these commands because they ensure compatibility with S/36 (important in the early days of the AS/400).

You can use the Display Command (DSPCMD) command to display the command attributes, including the ALWLMTUSR setting. Using DSPCMD to look for all commands with ALWTLMTUSR(*YES) would be tedious because each command would be displayed. The Check Allow Limited Users (CHKALWLMTX) program uses the QCDRCMDI API to retrieve command information. (Download the code in this article from the MC Web site at http://www.midrangecomputing. com/mc/98/11.) The program checks the ALWLMTUSR setting and sends journal entries to report all commands that are ALWLMTUSR (*YES). The CHKALWLMTU command definition source (also available from MC’s Web site) provides an ease of use interface to the program. The data is printed using the query shown in Figure 1.

Wayne O. Evans is an AS/400 security consultant and a frequent speaker on security topics. During his 27 years with IBM Corporation, he was involved with AS/400 security design issues. Prior to working on security, Wayne worked on message handling and work management and was the team leader for the command definition and CL language on the S/38.

Selected files

ID File Library Member Record Format

T01 CHKALWLMTU QTEMP *FIRST QJORDJE

Result fields

Name Expression Column Heading

COMMAND SUBSTR(JOESD,1,10) Command

LIBRARY SUBSTR(JOESD,11,10) Library

Ordering of selected fields

Field Sort Ascending/ Break Field

Name Priority Descending Level Text

COMMAND

LIBRARY Figure 1: Query definition used to print commands with ALWLMTUSR(*YES)

BLOG COMMENTS POWERED BY DISQUS

LATEST COMMENTS

Support MC Press Online

$0.00 Raised:
$

Book Reviews

Resource Center

  • SB Profound WC 5536 Have you been wondering about Node.js? Our free Node.js Webinar Series takes you from total beginner to creating a fully-functional IBM i Node.js business application. You can find Part 1 here. In Part 2 of our free Node.js Webinar Series, Brian May teaches you the different tooling options available for writing code, debugging, and using Git for version control. Brian will briefly discuss the different tools available, and demonstrate his preferred setup for Node development on IBM i or any platform. Attend this webinar to learn:

  • SB Profound WP 5539More than ever, there is a demand for IT to deliver innovation. Your IBM i has been an essential part of your business operations for years. However, your organization may struggle to maintain the current system and implement new projects. The thousands of customers we've worked with and surveyed state that expectations regarding the digital footprint and vision of the company are not aligned with the current IT environment.

  • SB HelpSystems ROBOT Generic IBM announced the E1080 servers using the latest Power10 processor in September 2021. The most powerful processor from IBM to date, Power10 is designed to handle the demands of doing business in today’s high-tech atmosphere, including running cloud applications, supporting big data, and managing AI workloads. But what does Power10 mean for your data center? In this recorded webinar, IBMers Dan Sundt and Dylan Boday join IBM Power Champion Tom Huntington for a discussion on why Power10 technology is the right strategic investment if you run IBM i, AIX, or Linux. In this action-packed hour, Tom will share trends from the IBM i and AIX user communities while Dan and Dylan dive into the tech specs for key hardware, including:

  • Magic MarkTRY the one package that solves all your document design and printing challenges on all your platforms. Produce bar code labels, electronic forms, ad hoc reports, and RFID tags – without programming! MarkMagic is the only document design and print solution that combines report writing, WYSIWYG label and forms design, and conditional printing in one integrated product. Make sure your data survives when catastrophe hits. Request your trial now!  Request Now.

  • SB HelpSystems ROBOT GenericForms of ransomware has been around for over 30 years, and with more and more organizations suffering attacks each year, it continues to endure. What has made ransomware such a durable threat and what is the best way to combat it? In order to prevent ransomware, organizations must first understand how it works.

  • SB HelpSystems ROBOT GenericIT security is a top priority for businesses around the world, but most IBM i pros don’t know where to begin—and most cybersecurity experts don’t know IBM i. In this session, Robin Tatam explores the business impact of lax IBM i security, the top vulnerabilities putting IBM i at risk, and the steps you can take to protect your organization. If you’re looking to avoid unexpected downtime or corrupted data, you don’t want to miss this session.

  • SB HelpSystems ROBOT GenericCan you trust all of your users all of the time? A typical end user receives 16 malicious emails each month, but only 17 percent of these phishing campaigns are reported to IT. Once an attack is underway, most organizations won’t discover the breach until six months later. A staggering amount of damage can occur in that time. Despite these risks, 93 percent of organizations are leaving their IBM i systems vulnerable to cybercrime. In this on-demand webinar, IBM i security experts Robin Tatam and Sandi Moore will reveal:

  • FORTRA Disaster protection is vital to every business. Yet, it often consists of patched together procedures that are prone to error. From automatic backups to data encryption to media management, Robot automates the routine (yet often complex) tasks of iSeries backup and recovery, saving you time and money and making the process safer and more reliable. Automate your backups with the Robot Backup and Recovery Solution. Key features include:

  • FORTRAManaging messages on your IBM i can be more than a full-time job if you have to do it manually. Messages need a response and resources must be monitored—often over multiple systems and across platforms. How can you be sure you won’t miss important system events? Automate your message center with the Robot Message Management Solution. Key features include:

  • FORTRAThe thought of printing, distributing, and storing iSeries reports manually may reduce you to tears. Paper and labor costs associated with report generation can spiral out of control. Mountains of paper threaten to swamp your files. Robot automates report bursting, distribution, bundling, and archiving, and offers secure, selective online report viewing. Manage your reports with the Robot Report Management Solution. Key features include:

  • FORTRAFor over 30 years, Robot has been a leader in systems management for IBM i. With batch job creation and scheduling at its core, the Robot Job Scheduling Solution reduces the opportunity for human error and helps you maintain service levels, automating even the biggest, most complex runbooks. Manage your job schedule with the Robot Job Scheduling Solution. Key features include:

  • LANSA Business users want new applications now. Market and regulatory pressures require faster application updates and delivery into production. Your IBM i developers may be approaching retirement, and you see no sure way to fill their positions with experienced developers. In addition, you may be caught between maintaining your existing applications and the uncertainty of moving to something new.

  • LANSAWhen it comes to creating your business applications, there are hundreds of coding platforms and programming languages to choose from. These options range from very complex traditional programming languages to Low-Code platforms where sometimes no traditional coding experience is needed. Download our whitepaper, The Power of Writing Code in a Low-Code Solution, and:

  • LANSASupply Chain is becoming increasingly complex and unpredictable. From raw materials for manufacturing to food supply chains, the journey from source to production to delivery to consumers is marred with inefficiencies, manual processes, shortages, recalls, counterfeits, and scandals. In this webinar, we discuss how:

  • The MC Resource Centers bring you the widest selection of white papers, trial software, and on-demand webcasts for you to choose from. >> Review the list of White Papers, Trial Software or On-Demand Webcast at the MC Press Resource Center. >> Add the items to yru Cart and complet he checkout process and submit

  • Profound Logic Have you been wondering about Node.js? Our free Node.js Webinar Series takes you from total beginner to creating a fully-functional IBM i Node.js business application.

  • SB Profound WC 5536Join us for this hour-long webcast that will explore:

  • Fortra IT managers hoping to find new IBM i talent are discovering that the pool of experienced RPG programmers and operators or administrators with intimate knowledge of the operating system and the applications that run on it is small. This begs the question: How will you manage the platform that supports such a big part of your business? This guide offers strategies and software suggestions to help you plan IT staffing and resources and smooth the transition after your AS/400 talent retires. Read on to learn: