| name | performing-ssl-tls-inspection-configuration |
| description | Configure SSL/TLS inspection on network security devices to decrypt, inspect, and re-encrypt HTTPS traffic for threat detection while managing certificates, exemptions, and privacy compliance. |
| domain | cybersecurity |
| subdomain | network-security |
| tags | ["ssl-inspection","tls-decryption","https-inspection","certificate-management","proxy","man-in-the-middle","network-security","forward-proxy"] |
| version | 1.0 |
| author | mahipal |
| license | Apache-2.0 |
| nist_csf | ["PR.IR-01","DE.CM-01","ID.AM-03","PR.DS-02"] |
Performing SSL/TLS Inspection Configuration
Overview
SSL/TLS inspection (also called SSL decryption, HTTPS inspection, or TLS break-and-inspect) intercepts encrypted traffic between clients and servers to inspect the cleartext content for malware, data exfiltration, policy violations, and command-and-control communications. The inspection device acts as a trusted man-in-the-middle, terminating the TLS session from the client, inspecting the plaintext content, and establishing a new TLS session to the destination server. With over 95% of web traffic now encrypted, organizations without TLS inspection have a massive blind spot. This skill covers configuring TLS inspection on next-generation firewalls, deploying trusted CA certificates, managing exemptions for certificate-pinned applications, and ensuring compliance with privacy regulations.
When to Use
- When conducting security assessments that involve performing ssl tls inspection configuration
- When following incident response procedures for related security events
- When performing scheduled security testing or auditing activities
- When validating security controls through hands-on testing
Prerequisites
- Next-generation firewall or secure web gateway with TLS inspection capability
- Internal Certificate Authority (CA) for signing inspection certificates
- Endpoint certificate management (GPO, MDM, or manual deployment)
- Privacy and legal review for TLS inspection scope
- Understanding of PKI, X.509 certificates, and TLS handshake
Core Concepts
SSL/TLS Inspection Modes
| Mode | Direction | Description |
|---|
| SSL Forward Proxy | Outbound | Intercepts client-to-internet HTTPS connections |
| SSL Inbound Inspection | Inbound | Decrypts traffic destined for internal servers |
| SSH Proxy | Both | Inspects SSH tunneled traffic |
Forward Proxy Process
Client Firewall/Proxy Web Server
│ │ │
│──TLS ClientHello──────→│ │
│ │──TLS ClientHello───────→│
│ │←─TLS ServerHello────────│
│ │ (real server cert) │
│ │ │
│ │ [Validates server cert] │
│ │ [Generates proxy cert │
│ │ signed by internal CA] │
│ │ │
│←─TLS ServerHello───────│ │
│ (proxy-signed cert) │ │
│ │ │
│──Encrypted data────────→│ [Decrypt, Inspect] │
│ │──Encrypted data────────→│
│←─Encrypted data─────────│ [Decrypt, Inspect] │
│ │←─Encrypted data─────────│
