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Introduction:
Identity Governance and Administration (IGA) is the backbone of Zero Trust security, ensuring that every access right is justified, reviewed, and revoked when no longer needed. Without IGA, organizations suffer from permission sprawl, insider threats, compliance audit failures, and silent backdoors left by departed employees. This article breaks down IGA core capabilities, provides hands-on commands for auditing identities on Linux and Windows, and delivers a step‑by‑step playbook to implement identity lifecycle governance.
Learning Objectives:
- Implement identity lifecycle automation using PowerShell and Bash scripts to detect stale accounts and orphaned permissions.
- Configure access certification campaigns and role-based access control (RBAC) reviews with native OS and cloud tools.
- Apply least privilege principles through automated provisioning and deprovisioning workflows, reducing attack surface by 60%+.
You Should Know:
1. Identity Lifecycle Management – Automating Joiner/Mover/Leaver Processes
Step‑by‑step guide to detect and disable stale user accounts:
Scenario: Users who haven’t logged in for 90 days pose an unnecessary risk. Below commands identify and disable them on Windows (Active Directory) and Linux (local users).
Windows (PowerShell as Administrator – Active Directory module):
Import AD module
Import-Module ActiveDirectory
Find users inactive for 90+ days
$staleDate = (Get-Date).AddDays(-90)
Get-ADUser -Filter {LastLogonDate -lt $staleDate -and Enabled -eq $true} -Properties LastLogonDate |
Select-Object Name, SamAccountName, LastLogonDate |
Export-Csv C:\IGA_Reports\stale_users.csv -1oTypeInformation
Disable stale users (after approval)
Get-ADUser -Filter {LastLogonDate -lt $staleDate -and Enabled -eq $true} |
Disable-ADUser -Verbose
Linux (Bash – local user audit):
!/bin/bash
Check users with no login in 90 days
inactive_days=90
current_time=$(date +%s)
for user in $(awk -F: '$3>=1000 {print $1}' /etc/passwd); do
last_login=$(lastlog -u "$user" | tail -1 | awk '{print $4"-"$5"-"$6}')
if [ -z "$last_login" ]; then
echo "$user - never logged in"
else
last_seconds=$(date -d "$last_login" +%s 2>/dev/null)
if [ -1 "$last_seconds" ]; then
diff_days=$(( (current_time - last_seconds) / 86400 ))
if [ $diff_days -gt $inactive_days ]; then
echo "$user - inactive for $diff_days days"
Optional: disable account with `sudo passwd -l $user`
fi
fi
fi
done
What this does: These commands enumerate identities, cross‑reference last logon timestamps, and produce actionable reports. Use the CSV output to feed into access certification workflows.
- Access Requests & Approval Workflows – Orchestrating Least Privilege
Step‑by‑step guide to simulate an access request system with PowerShell + SQLite:
Goal: Create a lightweight request tracking system for temporary elevated access (e.g., just‑in‑time admin).
Install SQLite module
Install-PackageProvider -1ame NuGet -Force
Install-Module -1ame PSSQLite -Force
Create request database
$dbPath = "C:\IGA\AccessRequests.db"
$createTable = @"
CREATE TABLE IF NOT EXISTS Requests (
Id INTEGER PRIMARY KEY,
Requester TEXT,
Resource TEXT,
Justification TEXT,
StartTime TEXT,
EndTime TEXT,
Status TEXT
);
"@
Invoke-SqliteQuery -DataSource $dbPath -Query $createTable
Insert a new request
$insertQuery = "INSERT INTO Requests (Requester, Resource, Justification, StartTime, EndTime, Status)
VALUES ('jsmith', 'SQL_Prod_Read', 'Audit report generation', '2025-06-01 09:00', '2025-06-01 17:00', 'Pending')"
Invoke-SqliteQuery -DataSource $dbPath -Query $insertQuery
Approve workflow (manual trigger)
$approveQuery = "UPDATE Requests SET Status = 'Approved' WHERE Id = 1"
Invoke-SqliteQuery -DataSource $dbPath -Query $approveQuery
How to use it: Integrate with Azure Logic Apps or Power Automate to send approval emails. After approval, a scheduled script grants AD group membership for the specified duration, then auto‑revokes.
- Access Certification Campaigns – Manual and Automated Reviews
Step‑by‑step guide to run an access review using PowerShell and Export‑CSV for business owners:
Best practice: Quarterly reviews of privileged roles (Domain Admins, Global Admins, root).
Windows – Export privileged group members:
List all members of Domain Admins
Get-ADGroupMember -Identity "Domain Admins" |
Select-Object Name, SamAccountName, objectClass |
Export-Csv C:\IGA_Reviews\DomainAdmins_$(Get-Date -Format yyyyMMdd).csv
Compare against authorized list (manual step)
$authorized = Get-Content "C:\IGA\authorized_admins.txt"
$current = (Get-ADGroupMember "Domain Admins").SamAccountName
$unauthorized = Compare-Object -ReferenceObject $authorized -DifferenceObject $current |
Where-Object {$_.SideIndicator -eq "=>"} | Select-Object -ExpandProperty InputObject
if ($unauthorized) {
Write-Warning "Unauthorized users: $unauthorized"
Remove unauthorized: Remove-ADGroupMember -Identity "Domain Admins" -Members $unauthorized -Confirm:$false
}
Linux – Audit sudoers and root group:
Check users in 'wheel' or 'sudo' group (depending on distro) grep -E '^(sudo|wheel):' /etc/group | cut -d: -f4 | tr ',' '\n' > /tmp/current_sudoers.txt Compare with authorized list comm -23 <(sort /tmp/current_sudoers.txt) <(sort /etc/authorized_sudoers.txt)
Step‑by‑step what this does: The script exports all current privileged members, flags discrepancies against a pre‑approved list, and optionally auto‑remediates after manager confirmation.
4. Automated Provisioning & Deprovisioning – Onboarding/Offboarding Automation
Step‑by‑step guide to a complete offboarding script (Windows AD + Exchange + Home directory):
Offboarding script - run as domain admin
param($Username)
<ol>
<li>Disable AD account
Disable-ADAccount -Identity $Username</p></li>
<li><p>Move to "Disabled Users" OU
Get-ADUser $Username | Move-ADObject -TargetPath "OU=Disabled,DC=contoso,DC=com"</p></li>
<li><p>Remove group memberships (except Domain Users)
$groups = Get-ADUser $Username -Properties MemberOf | Select-Object -ExpandProperty MemberOf
foreach ($group in $groups) {
Remove-ADGroupMember -Identity $group -Members $Username -Confirm:$false
}</p></li>
<li><p>Revoke Exchange permissions (if on-prem)
Disable-Mailbox -Identity $Username -Confirm:$false</p></li>
<li><p>Archive home drive to read-only location
$homeDrive = "\fileserver\home\$Username"
$archivePath = "\archive\leavers\$Username-$(Get-Date -Format yyyyMMdd)"
Copy-Item -Path $homeDrive -Destination $archivePath -Recurse -Force
Set-Acl -Path $archivePath -Acl (Get-Acl -Path $archivePath) -SetAccessRuleProtection $true</p></li>
</ol>
<p>Write-Host "Offboarding completed for $Username" -ForegroundColor Green
Usage: Run `.\Offboard.ps1 -Username “jdoe”` when HR triggers termination. Integrate with Workday or SAP via REST API calls inside the script.
- API Security & IGA – Hardening Identity Endpoints
Step‑by‑step guide to audit and secure SCIM / OAuth2 endpoints used for provisioning:
Common vulnerability: Excessive scope tokens allowing account creation without approval.
Check OAuth2 scope misconfigurations (using `curl` and `jq`):
Request token with limited scope (should fail if properly configured)
curl -X POST https://your-iga-api/oauth/token \
-d "grant_type=client_credentials&client_id=audit_tool&client_secret=&scope=user:delete" \
-H "Content-Type: application/x-www-form-urlencoded" | jq .
Validate token's actual scopes
TOKEN="your_jwt"
curl -X GET https://your-iga-api/introspect?token=$TOKEN | jq '.scope'
Enforce least privilege – PowerShell example to rotate client secrets
$newSecret = -join ((65..90) + (97..122) + (48..57) | Get-Random -Count 32 | ForEach-Object {[bash]$_})
Set-AzureADApplication -ObjectId $appId -PasswordCredentials @(@{CustomKeyIdentifier="IGA_Secret"; Value=$newSecret; StartDate=(Get-Date); EndDate=(Get-Date).AddYears(1)})
Write-Host "New secret: $newSecret – store in Azure Key Vault"
How to use: Run the token introspection weekly to detect privilege creep. Implement a pipeline that rotates secrets every 90 days and rejects tokens with unused scopes.
- Compliance Reporting & Analytics – GDPR, SOX, HIPAA
Step‑by‑step guide to generate a “who has access to sensitive data” report:
Target: Identify all users with access to a specific finance SMB share or database.
Windows – ACL enumeration on file server:
$path = "\fs\Finance$\QuarterlyReports"
$acls = Get-Acl -Path $path | Select-Object -ExpandProperty Access
$acls | Where-Object {$<em>.IdentityReference -1otlike "BUILTIN" -and $</em>.IdentityReference -1otlike "NT AUTHORITY"} |
Select-Object IdentityReference, FileSystemRights, IsInherited |
Export-Csv "C:\IGA_Reports\Finance_Access_$(Get-Date -Format yyyyMMdd).csv"
Linux – Find world‑readable sensitive files:
Find files with 644/666 permissions under /etc/shadow or /var/backups
find / -type f ( -perm -o=r -o -perm -o=w ) -exec ls -la {} \; 2>/dev/null | grep -E "(shadow|pam|ssl|private)"
What this does: The command walks directory trees, extracts ACLs, and flags overly permissive entries. Feed the CSV into a GRC dashboard (Power BI or Splunk) for real‑time compliance.
What Undercode Say:
- Key Takeaway 1: IGA is not just about “who has access” but “why they have it and for how long.” Most breaches exploiting valid credentials could have been prevented with automated certification and deprovisioning workflows.
- Key Takeaway 2: Open‑source scripts (PowerShell/Bash) combined with lightweight databases can replace expensive IGA tools for small to mid‑sized businesses. The real challenge is cultural – getting business owners to review access quarterly.
Analysis (10 lines): The post correctly highlights IGA’s expansion from traditional identity management to continuous governance. The inclusion of “workflow orchestration” and “analytics” signals a shift toward AI‑driven identity risk scoring. However, many organizations still treat IGA as a one‑time project rather than an ongoing “continuous compliance” engine. The technical commands provided above demonstrate that even without commercial tools, any IT team can implement core IGA functions – disabling stale accounts, certifying privileged groups, and logging access reviews. The missing piece is integration with HR systems and ticketing tools, which can be solved via REST APIs and low‑code automation. As Zero Trust matures, IGA becomes the enforcement layer for “never trust, always verify” because it continuously validates that every access grant is still justified. The post’s emphasis on “remove when no longer needed” is especially critical – studies show 40% of accounts in large enterprises are orphaned or dormant. Finally, combining IGA with just‑in‑time (JIT) elevation (e.g., PIM in Azure AD) reduces standing privileges by 90%, directly mitigating lateral movement attacks.
Prediction:
- +1 IGA will converge with AI/ML anomaly detection by 2026, automatically flagging access patterns that deviate from a user’s historical baseline and triggering certification campaigns without human input.
- -1 Organizations that rely solely on manual access reviews will face a 300% increase in compliance fines as regulators (GDPR, SEC) begin mandating continuous, auditable governance with sub‑30‑day revocation SLAs.
- +1 The rise of non‑human identities (service accounts, API keys, DevOps bots) will push IGA vendors to introduce “machine identity governance” as a standalone category, with automated rotation and risk scoring built into CI/CD pipelines.
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