Building Identity Governance Lifecycle Process

"""
Identity Lifecycle State Machine
Defines all identity states and valid transitions with automated actions.
"""

IDENTITY_LIFECYCLE = {
    "states": {
        "PRE_HIRE": {
            "description": "Identity created from HR feed before start date",
            "automated_actions": [
                "Create identity record in IGA platform",
                "Generate unique employee ID",
                "Create mailbox reservation",
                "Assign birthright roles based on job code",
                "Initiate background check workflow"
            ],
            "valid_transitions": ["ACTIVE", "CANCELLED"]
        },
        "ACTIVE": {
            "description": "Employee has started, full access provisioned",
            "automated_actions": [
                "Create Active Directory account",
                "Create email mailbox",
                "Provision birthright application access",
                "Assign department-specific roles",
                "Add to distribution groups",
                "Issue MFA token/security key",
                "Create VPN account if remote worker"
            ],
            "valid_transitions": ["ROLE_CHANGE", "LEAVE_OF_ABSENCE", "TERMINATED"]
        },
        "ROLE_CHANGE": {
            "description": "Employee transferred, promoted, or changed departments",
            "automated_actions": [
                "Recalculate role assignments based on new job code",
                "Remove access from previous department applications",
                "Provision access for new department applications",
                "Update group memberships",
                "Transfer manager in directory",
                "Trigger access review for retained entitlements",
                "Notify new manager of inherited access"
            ],
            "valid_transitions": ["ACTIVE", "LEAVE_OF_ABSENCE", "TERMINATED"]
        },
        "LEAVE_OF_ABSENCE": {
            "description": "Employee on extended leave (medical, parental, sabbatical)",
            "automated_actions": [
                "Disable interactive login (preserve account)",
                "Suspend VPN access",
                "Set out-of-office auto-reply",
                "Delegate mailbox to manager",
                "Preserve all role assignments for return",
                "Set reactivation date from HR feed"
            ],
            "valid_transitions": ["ACTIVE", "TERMINATED"]
        },
        "TERMINATED": {
            "description": "Employee has left the organization",
            "automated_actions": [
                "Disable AD account immediately",
                "Revoke all application access",
                "Revoke VPN and remote access",
                "Convert mailbox to shared (manager access for 90 days)",
                "Transfer OneDrive files to manager",
                "Remove from all security and distribution groups",
                "Revoke OAuth tokens and API keys",
                "Wipe corporate data from mobile devices",
                "Archive identity record",
                "Schedule account deletion after retention period"
            ],
            "valid_transitions": ["REHIRE", "DELETED"]
        },
        "REHIRE": {
            "description": "Previously terminated employee returning",
            "automated_actions": [
                "Reactivate existing identity record",
                "Reset credentials and require MFA re-enrollment",
                "Provision based on new job code (not previous access)",
                "Flag for enhanced access review in first 30 days"
            ],
            "valid_transitions": ["ACTIVE"]
        },
        "DELETED": {
            "description": "Account permanently removed after retention period",
            "automated_actions": [
                "Delete AD account",
                "Delete email mailbox archive",
                "Remove identity record from IGA",
                "Generate deletion audit log"
            ],
            "valid_transitions": []
        }
    },
    "retention_periods": {
        "terminated_to_deleted": "90 days (default)",
        "mailbox_retention": "90 days as shared mailbox",
        "onedrive_retention": "30 days manager access, then archived",
        "audit_log_retention": "7 years for compliance"
    }
}

"""
HR Source Integration - Workday to IGA Platform Connector
Polls Workday for employee lifecycle events and triggers provisioning.
"""
import requests
from datetime import datetime, timedelta
import logging

class WorkdayIdentityConnector:
    def __init__(self, config):
        self.base_url = config["workday_api_url"]
        self.tenant = config["tenant"]
        self.client_id = config["client_id"]
        self.client_secret = config["client_secret"]
        self.session = requests.Session()
        self.logger = logging.getLogger("workday_connector")

    def get_access_token(self):
        """Authenticate to Workday REST API."""
        token_url = f"{self.base_url}/ccx/oauth2/{self.tenant}/token"
        response = self.session.post(token_url, data={
            "grant_type": "client_credentials",
            "client_id": self.client_id,
            "client_secret": self.client_secret
        })
        response.raise_for_status()
        return response.json()["access_token"]

    def fetch_worker_changes(self, since_datetime):
        """Fetch all worker lifecycle events since the last sync."""
        headers = {"Authorization": f"Bearer {self.get_access_token()}"}
        params = {
            "Updated_From": since_datetime.isoformat(),
            "Updated_Through": datetime.utcnow().isoformat(),
            "Count": 100
        }

        workers = []
        url = f"{self.base_url}/ccx/api/v1/{self.tenant}/workers"

        while url:
            response = self.session.get(url, headers=headers, params=params)
            response.raise_for_status()
            data = response.json()
            workers.extend(data.get("data", []))
            url = data.get("next", None)
            params = {}

        return workers

    def map_lifecycle_event(self, worker):
        """Map Workday worker data to identity lifecycle event."""
        worker_data = worker.get("workerData", {})
        employment = worker_data.get("employmentData", {})
        personal = worker_data.get("personalData", {})

        event = {
            "employee_id": worker.get("id"),
            "first_name": personal.get("legalName", {}).get("firstName"),
            "last_name": personal.get("legalName", {}).get("lastName"),
            "email": worker_data.get("emailAddress"),
            "job_code": employment.get("jobProfile", {}).get("id"),
            "job_title": employment.get("jobProfile", {}).get("name"),
            "department": employment.get("organization", {}).get("name"),
            "department_code": employment.get("organization", {}).get("id"),
            "manager_id": employment.get("managerId"),
            "location": employment.get("location", {}).get("name"),
            "cost_center": employment.get("costCenter", {}).get("id"),
            "hire_date": employment.get("hireDate"),
            "termination_date": employment.get("terminationDate"),
            "status": employment.get("status"),
            "worker_type": employment.get("workerType"),
        }

        # Determine lifecycle transition
        if event["status"] == "Active" and event["hire_date"]:
            hire_date = datetime.fromisoformat(event["hire_date"])
            if hire_date > datetime.utcnow():
                event["lifecycle_event"] = "PRE_HIRE"
            else:
                event["lifecycle_event"] = "JOINER"
        elif event["status"] == "Active":
            event["lifecycle_event"] = "MOVER"  # Department or role change
        elif event["status"] == "Terminated":
            event["lifecycle_event"] = "LEAVER"
        elif event["status"] == "On Leave":
            event["lifecycle_event"] = "LEAVE_OF_ABSENCE"

        return event

    def process_lifecycle_events(self, since_datetime):
        """Main processing loop for identity lifecycle events."""
        workers = self.fetch_worker_changes(since_datetime)
        events = []

        for worker in workers:
            event = self.map_lifecycle_event(worker)
            events.append(event)
            self.logger.info(
                f"Lifecycle event: {event['lifecycle_event']} for "
                f"{event['first_name']} {event['last_name']} "
                f"(EmpID: {event['employee_id']})"
            )

        return events

"""
Role Mining Engine
Analyzes existing access patterns to derive role definitions
for birthright (automatic) provisioning.
"""
import pandas as pd
from collections import Counter
from itertools import combinations

class RoleMiningEngine:
    def __init__(self, access_data):
        """
        access_data: DataFrame with columns
        [employee_id, job_code, department, application, entitlement]
        """
        self.access_data = access_data

    def mine_birthright_roles(self, min_assignment_pct=0.8):
        """
        Identify entitlements that should be automatically assigned
        based on job code. If 80%+ of users with same job code
        have an entitlement, it becomes birthright access.
        """
        birthright_roles = {}

        for job_code, group in self.access_data.groupby("job_code"):
            total_users = group["employee_id"].nunique()
            entitlement_counts = group.groupby(
                ["application", "entitlement"]
            )["employee_id"].nunique()

            birthright_entitlements = []
            for (app, ent), count in entitlement_counts.items():
                pct = count / total_users
                if pct >= min_assignment_pct:
                    birthright_entitlements.append({
                        "application": app,
                        "entitlement": ent,
                        "assignment_percentage": round(pct * 100, 1),
                        "user_count": count
                    })

            if birthright_entitlements:
                birthright_roles[job_code] = {
                    "job_code": job_code,
                    "total_users": total_users,
                    "birthright_entitlements": birthright_entitlements
                }

        return birthright_roles

    def detect_role_explosion(self):
        """Identify roles with excessive overlap indicating need for consolidation."""
        roles = self.access_data.groupby("job_code").apply(
            lambda x: set(zip(x["application"], x["entitlement"]))
        )

        overlap_report = []
        for (role1, ents1), (role2, ents2) in combinations(roles.items(), 2):
            if len(ents1) == 0 or len(ents2) == 0:
                continue
            overlap = len(ents1 & ents2)
            max_size = max(len(ents1), len(ents2))
            overlap_pct = overlap / max_size * 100

            if overlap_pct > 70:
                overlap_report.append({
                    "role_1": role1,
                    "role_2": role2,
                    "role_1_entitlements": len(ents1),
                    "role_2_entitlements": len(ents2),
                    "overlapping_entitlements": overlap,
                    "overlap_percentage": round(overlap_pct, 1),
                    "recommendation": "CONSOLIDATE" if overlap_pct > 90 else "REVIEW"
                })

        return sorted(overlap_report, key=lambda x: x["overlap_percentage"], reverse=True)

    def find_orphaned_access(self):
        """
        Find entitlements that no longer align with any role definition.
        These are exceptions that accumulated over time.
        """
        # Get birthright definitions
        birthright = self.mine_birthright_roles(min_assignment_pct=0.5)

        orphaned = []
        for _, row in self.access_data.iterrows():
            job_birthright = birthright.get(row["job_code"], {})
            expected_ents = set()
            for ent in job_birthright.get("birthright_entitlements", []):
                expected_ents.add((ent["application"], ent["entitlement"]))

            current_ent = (row["application"], row["entitlement"])
            if current_ent not in expected_ents:
                orphaned.append({
                    "employee_id": row["employee_id"],
                    "job_code": row["job_code"],
                    "application": row["application"],
                    "entitlement": row["entitlement"],
                    "recommendation": "Review for revocation"
                })

        return pd.DataFrame(orphaned)

"""
Access Request Workflow Engine
Handles self-service access requests with multi-level approvals
based on risk classification of requested entitlements.
"""

ACCESS_REQUEST_WORKFLOW = {
    "risk_levels": {
        "LOW": {
            "description": "Standard business applications",
            "examples": ["Email distribution groups", "SharePoint team sites", "Standard SaaS apps"],
            "approval_chain": ["manager"],
            "sla_hours": 4,
            "auto_approve_if_birthright": True
        },
        "MEDIUM": {
            "description": "Sensitive data access or elevated permissions",
            "examples": ["CRM admin", "Financial reporting", "HR systems"],
            "approval_chain": ["manager", "application_owner"],
            "sla_hours": 24,
            "auto_approve_if_birthright": False
        },
        "HIGH": {
            "description": "Privileged access or regulated data",
            "examples": ["Database admin", "Cloud admin", "PAM vault access"],
            "approval_chain": ["manager", "application_owner", "security_team"],
            "sla_hours": 48,
            "auto_approve_if_birthright": False,
            "require_justification": True,
            "require_time_limit": True
        },
        "CRITICAL": {
            "description": "Domain admin, root access, or production data modification",
            "examples": ["Domain Admin", "AWS root", "Production DB write"],
            "approval_chain": ["manager", "application_owner", "security_team", "ciso"],
            "sla_hours": 72,
            "auto_approve_if_birthright": False,
            "require_justification": True,
            "require_time_limit": True,
            "require_sod_check": True,
            "max_duration_days": 90
        }
    }
}

class AccessRequestEngine:
    def __init__(self, iga_client, risk_catalog):
        self.iga = iga_client
        self.risk_catalog = risk_catalog

    def submit_request(self, requester_id, entitlement_id, justification, duration_days=None):
        """Submit an access request with automatic risk classification."""
        # Classify risk level of requested entitlement
        risk_level = self.risk_catalog.get_risk_level(entitlement_id)
        workflow = ACCESS_REQUEST_WORKFLOW["risk_levels"][risk_level]

        # Check if entitlement is birthright for requester's role
        requester = self.iga.get_identity(requester_id)
        is_birthright = self.iga.is_birthright_for_role(
            entitlement_id, requester["job_code"]
        )

        if is_birthright and workflow.get("auto_approve_if_birthright"):
            return self._auto_approve(requester_id, entitlement_id, "Birthright access")

        # Run SOD check if required
        if workflow.get("require_sod_check"):
            sod_violations = self.iga.check_sod(requester_id, entitlement_id)
            if sod_violations:
                return {
                    "status": "SOD_VIOLATION",
                    "violations": sod_violations,
                    "action": "Request requires compensating control approval"
                }

        # Create approval chain
        request = {
            "requester": requester_id,
            "entitlement": entitlement_id,
            "risk_level": risk_level,
            "justification": justification,
            "duration_days": duration_days or workflow.get("max_duration_days"),
            "approval_chain": self._build_approval_chain(
                requester, workflow["approval_chain"]
            ),
            "sla_deadline": workflow["sla_hours"],
            "status": "PENDING_APPROVAL"
        }

        return self.iga.create_request(request)

    def _build_approval_chain(self, requester, approver_types):
        """Resolve approval chain to actual approver identities."""
        chain = []
        for approver_type in approver_types:
            if approver_type == "manager":
                chain.append({
                    "type": "manager",
                    "identity": requester["manager_id"],
                    "fallback": requester.get("skip_manager_id")
                })
            elif approver_type == "application_owner":
                chain.append({
                    "type": "application_owner",
                    "identity": "resolved_at_runtime",
                    "fallback": "it-governance-team"
                })
            elif approver_type == "security_team":
                chain.append({
                    "type": "group",
                    "identity": "security-governance-team",
                    "required_approvals": 1
                })
            elif approver_type == "ciso":
                chain.append({
                    "type": "role",
                    "identity": "CISO",
                    "fallback": "deputy-ciso"
                })
        return chain

"""
Orphaned Account Detection
Identifies accounts in target systems that have no corresponding
active identity in the authoritative HR source.
"""

class OrphanedAccountDetector:
    def __init__(self, hr_connector, app_connectors):
        self.hr = hr_connector
        self.apps = app_connectors

    def detect_orphaned_accounts(self):
        """Compare application accounts against HR active employees."""
        active_employees = set(self.hr.get_active_employee_ids())
        orphaned_accounts = []

        for app_name, connector in self.apps.items():
            app_accounts = connector.get_all_accounts()

            for account in app_accounts:
                correlated_id = account.get("employee_id") or account.get("correlation_id")

                if correlated_id and correlated_id not in active_employees:
                    # Check if recently terminated (within grace period)
                    termination_info = self.hr.get_termination_info(correlated_id)

                    orphaned_accounts.append({
                        "application": app_name,
                        "account_name": account["username"],
                        "correlated_employee_id": correlated_id,
                        "account_status": account.get("status", "unknown"),
                        "last_login": account.get("last_login"),
                        "termination_date": termination_info.get("date") if termination_info else None,
                        "days_since_termination": (
                            (datetime.utcnow() - termination_info["date"]).days
                            if termination_info and termination_info.get("date") else None
                        ),
                        "risk_level": self._assess_orphan_risk(account, termination_info)
                    })

                elif not correlated_id:
                    # Uncorrelated account - no link to any employee
                    orphaned_accounts.append({
                        "application": app_name,
                        "account_name": account["username"],
                        "correlated_employee_id": None,
                        "account_status": account.get("status", "unknown"),
                        "last_login": account.get("last_login"),
                        "risk_level": "HIGH",
                        "reason": "Uncorrelated - no employee association"
                    })

        return orphaned_accounts

    def _assess_orphan_risk(self, account, termination_info):
        """Assess risk level of orphaned account."""
        if account.get("is_privileged"):
            return "CRITICAL"
        if termination_info and termination_info.get("involuntary"):
            return "HIGH"
        if account.get("status") == "active":
            return "HIGH"
        return "MEDIUM"

    def generate_remediation_plan(self, orphaned_accounts):
        """Create remediation actions for orphaned accounts."""
        plan = []
        for account in orphaned_accounts:
            if account["risk_level"] == "CRITICAL":
                action = "DISABLE_IMMEDIATELY"
                sla = "4 hours"
            elif account["risk_level"] == "HIGH":
                action = "DISABLE_WITHIN_24H"
                sla = "24 hours"
            else:
                action = "REVIEW_AND_DISABLE"
                sla = "7 days"

            plan.append({
                **account,
                "remediation_action": action,
                "sla": sla,
                "assigned_to": "identity-governance-team"
            })

        return sorted(plan, key=lambda x: ["CRITICAL", "HIGH", "MEDIUM", "LOW"].index(x["risk_level"]))