16. Enterprise Zero-Trust Architecture: Cloud IAM, Bastion Hosts & WireGuard VPN Networks • Git, System Design & Web Security (OWASP Top 10) • Rishabh Ki Kaksha

Git, System Design & Web Security (OWASP Top 10) › 16. Enterprise Zero-Trust Architecture: Cloud IAM, Bastion Hosts & WireGuard VPN Networks

45 mins

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Course Syllabus

Module 1: Git Internals, Plumbing Commands & DAG Graph Architecture

01. Git Internals: Blobs, Trees, Commits & Annotated Tags (The .git Directory Anatomy) 02. Git DAG (Directed Acyclic Graph) & Plumbing Commands (cat-file, hash-object, write-tree) 03. Git Three Trees Architecture: Working Directory, Staging Index & HEAD

Part 1: Git Mastery, Security Defense & Caching

Module 2: Advanced Branching Strategies & Disaster Recovery

04. Advanced Rebasing: Interactive Rebase (squash, edit, fixup) vs Merge 05. Git Disaster Recovery: git reflog, Cherry-Pick & Recovering Deleted Commits/Branches 06. Enterprise Branching: Trunk-Based Development vs GitFlow vs Feature Flag Architecture

Module 3: Web Application Security: OWASP Top 10 Defenses

07. OWASP #1 & #3: SQL Injection (SQLi) & Server-Side Request Forgery (SSRF) Hardening 08. Cross-Site Scripting (XSS): Stored, Reflected, DOM-based & Content Security Policy (CSP) 09. CSRF vs Cross-Origin Traps: SameSite Cookies, Anti-CSRF Tokens & CORS Preflight Rules 10. Broken Object-Level Authorization (BOLA/IDOR) & Role-Based Access Control (RBAC/ABAC)

Module 4: Cryptography, PKI, SSL/TLS & Mutual Auth (mTLS)

11. Asymmetric Cryptography (RSA vs ECC) & Digital Signatures with GPG Keys 12. Public Key Infrastructure (PKI), TLS 1.3 Handshake & Let's Encrypt Automation 13. Mutual TLS (mTLS) for Zero-Trust Service-to-Service Communication

Module 5: DevSecOps, Secret Scanning & Zero-Trust Security Architecture

14. Automated Secret Scanning (Gitleaks, Trufflehog) & Git Pre-Commit Hooks 15. Software Supply Chain Security: Dependabot, SBOM (Software Bill of Materials) & Signed Commits 16. Enterprise Zero-Trust Architecture: Cloud IAM, Bastion Hosts & WireGuard VPN Networks

Interactive Lesson Studio

# 16. Enterprise Zero-Trust Architecture: Cloud IAM, Bastion Hosts & WireGuard VPN Networks

> Git & Web Security Notes by Rishabh - Topic 16

---

### 1. The Zero-Trust Philosophy: "Never Trust, Always Verify" 🛡️

Purana Perimeter Model (Castle-and-Moat): VPN ke andar aate hi sab trusted.  
**Zero-Trust Model:** Har single request ko chahe wo internal VPC se aa rahi ho, **strictly authenticate, authorize aur encrypt** kiya jata hai!

```
                  [ PUBLIC INTERNET ]
                           ⬇
           [ Cloudflare Zero Trust / WireGuard VPN ]
                           ⬇
             [ Bastion Jump Host (SSH Port 22) ]
                           ⬇
┌─────────────────────────────────────────────────────────────┐
│ PRIVATE CLUSTER (Database & Internal Microservices)         │
│ (Zero Public IP Addresses - Accessible ONLY via Bastion!)  │
└─────────────────────────────────────────────────────────────┘
```

---

### 2. Cloud IAM: Principle of Least Privilege (PoLP) 🔑

Har service account ko sirf wahi permissions do jo strictly zaroori hain:
```json
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": ["s3:GetObject", "s3:PutObject"],
      "Resource": "arn:aws:s3:::boost-engine-backups/*"
    }
  ]
}
```

---

### 3. SSH Hardening on Production VPS (`/etc/ssh/sshd_config`)

```bash
# Disable Password Authentication (Key-based only):
PasswordAuthentication no

# Disable Direct Root Login:
PermitRootLogin no

# Enable Max Auth Tries:
MaxAuthTries 3
```

---

### 4. Master Comparison Matrix

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### 5. Interview Ke 3 Sawal Is Topic Se

1. **Bastion Host (Jump Box) ka kya purpose hota hai?** -> Private VPC me baithe database aur application servers ke liye 1 single hardened, audited SSH gateway provide karna taaki internal servers ka public IP address na ho.
2. **WireGuard VPN OpenVPN se fast kyu hai?** -> Linux Kernel space me direct C code me run karta hai (State-of-the-art Noise protocol, ChaCha20 encryption), zero context switching overhead ke sath.
3. **AWS Security Groups aur Network ACLs (NACL) me kya difference hai?** -> Security Groups stateful hote hain aur individual instance/ENI level par kaam karte hain; NACLs stateless hote hain aur poore subnet boundary level par packet filter karte hain.

---
**Course Completed:** Git & Web Security Mastery (All 16 Lessons Completed!) 🎉🚀🛡️🔒💎

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