Implementing Context-Aware Authentication
1. Understanding Context-Aware Authentication
| Aspect | Detail |
|---|
| Definition | Decisions use environment + state, not just credentials |
| Inputs | Location, device, time, network, risk |
| Output | Allow / step-up / deny with reason |
2. Implementing Access Context Analysis
Example: Context object
{
"user": { "id": "u_1", "trust_level": "verified" },
"device": { "id": "d_1", "compliant": true, "managed": true },
"network": { "ip": "1.2.3.4", "asn": 64500, "trusted": false },
"location": { "country": "US", "city": "Seattle" },
"time": "2026-05-18T18:00:00Z",
"risk_score": 15
}
3. Using Location-Based Authentication
| Source | Detail |
|---|
| GeoIP | Coarse; spoofable by VPN |
| GPS | Mobile only; user consent |
| Wi-Fi BSSID | Office presence detection |
| Geofencing | Allow only inside polygon |
4. Implementing Device Posture Checks
| Check | Detail |
|---|
| OS version | Up-to-date with patches |
| Disk encryption | FileVault / BitLocker on |
| Anti-malware | Running and current |
| MDM enrollment | Managed device |
| Jailbreak/root | Block |
5. Using Network-Based Access Controls
| Control | Detail |
|---|
| IP allowlist | Corporate ranges, VPN exit |
| ASN-based | Block hosting ranges for end-user apps |
| Anonymous proxy | Block VPN/Tor for high-risk |
6. Implementing User Behavior Analysis
| Signal | Detail |
|---|
| Typical hours | 9-5 baseline |
| Typical actions | Read vs write patterns |
| Velocity | Speed of operations |
7. Using Time-Based Restrictions
Example: Business hours policy
# OPA Rego
allow if {
input.user.role == "back_office"
now := time.parse_rfc3339_ns(input.environment.time)
hour := time.clock(now)[0]
hour >= 8; hour < 18
}
8. Implementing Risk Signals
| Source | Detail |
|---|
| Internal | Failed logins, MFA challenges |
| External | Threat feeds, breach corpora |
| CAEP / SSF | Cross-vendor risk event sharing |
9. Using Conditional Access Policies
| Platform | Detail |
|---|
| Microsoft Entra | Conditional Access Policies |
| Okta | Sign-on policies |
| Google | Context-Aware Access (BeyondCorp) |
| Custom | OPA + risk engine |
10. Implementing Zero Trust Principles
Never trust, always verify. Every request re-evaluated with current context. See section 56.