Linux & Cloud Security Architecture Blueprints

Production-tested configuration templates, eBPF network policies, kernel sandbox rulesets, and zero-trust deployment one-liners.

INTERACTIVE UTILITY

Zero-Trust Architecture Topology Builder

Design microservice security perimeters, eBPF kernel filters, and Envoy mTLS meshes with real-time Mermaid.js and SVG export.

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PILLAR HUB

The Ultimate Security Architecture Cheatsheet (2026)

A massive, zero-dependency pillar hub indexing all 25 advanced blueprints for eBPF, Sandboxing, Zero-Trust, and DFIR architectures.

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Zero-Trust • Interactive Visual Tool

Zero-Trust Topology Builder

Visual node-graph designer for zero-trust microservices, eBPF kernel enforcement, and mTLS meshes.

# Live Visual SVG & Mermaid.js Exporter
export topology --format=mermaid,svg,ascii
status: 100% Client-Side Local Execution
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eBPF • Network Security

Cilium eBPF Host Routing & Tetragon Tracing

Bypass iptables overhead with eBPF O(1) packet routing and enforce in-kernel process termination.

# Install Cilium with eBPF Host Routing enabled
helm install cilium cilium/cilium \
  --namespace kube-system \
  --set kubeProxyReplacement=strict \
  --set bpf.masquerade=true
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Linux Security • Access Control

Linux Landlock LSM Unprivileged Sandbox

Restrict process filesystem access without requiring root (CAP_SYS_ADMIN) permissions.

/* Enforce NO_NEW_PRIVS and lock down Landlock Sandbox */
prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
syscall(__NR_landlock_restrict_self, ruleset_fd, 0);
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Zero-Trust • SSH Authentication

Vault SSH CA Short-Lived Certificates

Eliminate static authorized_keys by trusting HashiCorp Vault CA 8-hour SSH user certificates.

# Configure /etc/ssh/sshd_config to trust Vault CA
TrustedUserCAKeys /etc/ssh/trusted-user-ca.pub
AuthorizedPrincipalsFile /etc/ssh/auth_principals/%u
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WebAssembly • Cloud-Native

WebAssembly (Wasm) WASI Runtime Isolation

Execute microservices inside linear memory sandboxes with nanosecond cold-start times.

# Execute Wasm module with explicit WASI capability grant
wasmtime run --dir /opt/app/data::/data \
  target/wasm32-wasip1/release/microservice.wasm
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Web Security • HTTP/3

HTTP/3 QUIC 0-RTT Replay Defense

Disable 0-RTT early data on state-modifying requests to prevent replay attack vectors.

# Reject 0-RTT Early Data on State-Modifying Routes
location /api/v1/payment {
    ssl_early_data off;
    proxy_pass http://127.0.0.1:8080;
}
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Supply Chain • Container Security

Sigstore Cosign Keyless Image Signing

Sign OCI container images keylessly in CI/CD using OIDC identity tokens and Rekor ledger.

# Verify Container Image Signature Keylessly
cosign verify \
  --certificate-identity "https://github.com/zyekhabdul/zyekh.com/.github/workflows/deploy.yml@refs/heads/main" \
  --certificate-oidc-issuer "https://token.actions.githubusercontent.com" \
  ghcr.io/zyekh/secure-api:v2.0.0
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Linux Security • Kernel Auditd

Auditd Kernel DFIR & Immutable Rules

Lock down audit rules with immutable flag (-e 2) and stream syscall telemetry to Vector & ClickHouse.

# Enforce immutable kernel audit policy
-e 2
-w /etc/shadow -p wa -k identity_changes
-a always,exit -F arch=b64 -S execve -k exec_monitor
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eBPF • Syscall Hardening

Linux Seccomp BPF Syscall Whitelisting

Restrict container and process attack surfaces by blocking unneeded Linux syscalls with SECCOMP_RET_KILL_PROCESS.

/* Load strict BPF syscall filter */
struct sock_fprog prog = { .len = filter_len, .filter = filter };
prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
syscall(__NR_seccomp, SECCOMP_SET_MODE_FILTER, 0, &prog);
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Zero-Trust • Linux PAM

Linux PAM Faillock Brute-Force Lockout

Mitigate automated SSH credential stuffing by enforcing PAM faillock deny counters and unlock timers.

# Configure /etc/security/faillock.conf
deny = 5
fail_interval = 900
unlock_time = 1800
even_deny_root
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Cloud-Native • Cryptography

Post-Quantum Hybrid TLS 1.3 Handshake

Deploy NIST FIPS 203 ML-KEM with X25519 hybrid key exchange in Nginx and OpenSSL against harvest-now attacks.

# Enable Post-Quantum Hybrid Key Exchange in Nginx
ssl_protocols TLSv1.3;
ssl_ecdh_curve X25519MLKEM768:x25519:secp384r1;
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Zero-Trust • Network Mesh

WireGuard Kernel VPN Full-Mesh Tunneling

Derive X25519 Curve25519 keys and establish encrypted in-kernel point-to-point tunnels between distributed VPS nodes.

[Interface]
PrivateKey = <NODE_PRIVATE_KEY>
Address = 10.0.0.1/24
ListenPort = 51820
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Linux Security • Sysctl Hardening

Linux Network Stack sysctl Hardening

Prevent IP spoofing, TCP SYN flood exhaustion, and ICMP redirects via kernel network subsystem flags.

# Configure /etc/sysctl.d/99-security.conf
net.ipv4.tcp_syncookies = 1
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.all.accept_redirects = 0
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OFFICIAL ECOSYSTEM • STORE

High-Density System Architecture & Cheatsheet Posters

Physical reference prints, Linux kernel cheatsheets, and developer apparel available on the official shop portal.

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