certctl — Open-Source Certificate Control Plane

A self-hosted certificate lifecycle platform. Track, renew, and deploy TLS certificates across your infrastructure with a web dashboard, REST API, and agent-based architecture where private keys never leave your servers.

What It Does

certctl gives you a single pane of glass for every TLS certificate in your organization. The web dashboard shows your full certificate inventory — what's healthy, what's expiring, what's already expired, and who owns each one. The REST API (40+ endpoints) lets you automate everything. Agents deployed on your infrastructure generate private keys locally and submit CSRs — private keys never leave your servers.

flowchart LR
    subgraph "Control Plane"
        API["REST API + Dashboard\n:8443"]
        PG[("PostgreSQL")]
    end

    subgraph "Your Infrastructure"
        A1["Agent"] --> T1["NGINX"]
        A2["Agent"] --> T2["F5 BIG-IP"]
        A3["Agent"] --> T3["IIS"]
    end

    API --> PG
    A1 & A2 & A3 -->|"CSR + status\n(no private keys)"| API
    API -->|"Signed certs"| A1 & A2 & A3
    API -->|"Issue/Renew"| CA["Certificate Authorities\nLocal CA · ACME"]

Quick Start

Docker Compose (Recommended)

git clone https://github.com/shankar0123/certctl.git
cd certctl
docker compose -f deploy/docker-compose.yml up -d

Wait ~30 seconds, then open http://localhost:8443 in your browser.

The dashboard comes pre-loaded with 14 demo certificates, 5 agents, policy rules, audit events, and notifications — a realistic snapshot of a certificate inventory so you can explore immediately.

Verify the API:

curl http://localhost:8443/health
# {"status":"healthy"}

curl -s http://localhost:8443/api/v1/certificates | jq '.total'
# 14

Manual Build

# Prerequisites: Go 1.22+, PostgreSQL 16+
go mod download
make build

# Set up database
export CERTCTL_DATABASE_URL="postgres://certctl:certctl@localhost:5432/certctl?sslmode=disable"
export CERTCTL_AUTH_TYPE=none
make migrate-up

# Start server
./bin/server

# Start agent (separate terminal)
export CERTCTL_SERVER_URL=http://localhost:8443
export CERTCTL_API_KEY=change-me-in-production
export CERTCTL_AGENT_NAME=local-agent
export CERTCTL_AGENT_ID=agent-local-01
./bin/agent --agent-id=agent-local-01

Documentation

Guide	Description
Concepts	TLS certificates explained from scratch — for beginners who know nothing about certs
Quick Start	Get running in 5 minutes with accurate API examples
Demo Walkthrough	5-7 minute guided stakeholder presentation
Advanced Demo	Issue a certificate end-to-end with technical deep-dives
Architecture	System design, data flow diagrams, security model
Connectors	Build custom issuer, target, and notifier connectors

Architecture

flowchart TB
    subgraph "Control Plane (certctl-server)"
        DASH["Web Dashboard\nReact SPA"]
        API["REST API\nGo 1.22 net/http"]
        SVC["Service Layer"]
        REPO["Repository Layer\ndatabase/sql + lib/pq"]
        SCHED["Scheduler\nRenewal · Jobs · Health · Notifications"]
    end

    subgraph "Data Store"
        PG[("PostgreSQL 16\n14 tables · TEXT primary keys")]
    end

    subgraph "Agents"
        AG["certctl-agent\nKey generation · CSR · Deployment"]
    end

    DASH --> API
    API --> SVC --> REPO --> PG
    SCHED --> SVC
    AG -->|"Heartbeat + CSR"| API
    API -->|"Cert + Chain"| AG

Key Design Decisions

• Private keys isolated from the control plane. Agents generate ECDSA P-256 keys locally and submit CSRs (public key only). The server signs the CSR and returns the certificate — private keys never touch the control plane. Server-side keygen is available via CERTCTL_KEYGEN_MODE=server for demo/development only.
• TEXT primary keys, not UUIDs. IDs are human-readable prefixed strings (mc-api-prod, t-platform, o-alice) so you can identify resource types at a glance in logs and queries.
• Handler → Service → Repository layering. Handlers define their own service interfaces for clean dependency inversion. No global service singletons.
• Idempotent migrations. All schema uses IF NOT EXISTS and seed data uses ON CONFLICT (id) DO NOTHING, safe for repeated execution.

Database Schema

Table	Purpose
managed_certificates	Certificate records with metadata, status, expiry, tags
certificate_versions	Historical versions with PEM chains and CSRs
renewal_policies	Renewal window, auto-renew settings, retry config, alert thresholds
issuers	CA configurations (Local CA, ACME, etc.)
deployment_targets	Target systems (NGINX, F5, IIS) with agent assignments
agents	Registered agents with heartbeat tracking
jobs	Issuance, renewal, deployment, and validation jobs
teams	Organizational groups for certificate ownership
owners	Individual owners with email for notifications
policy_rules	Enforcement rules (allowed issuers, environments, metadata)
policy_violations	Flagged non-compliance with severity levels
audit_events	Immutable action log (append-only, no update/delete)
notification_events	Email and webhook notification records
certificate_target_mappings	Many-to-many cert ↔ target relationships

Configuration

All server environment variables use the CERTCTL_ prefix:

Variable	Default	Description
CERTCTL_SERVER_HOST	127.0.0.1	Server bind address
CERTCTL_SERVER_PORT	8080	Server listen port
CERTCTL_DATABASE_URL	postgres://localhost/certctl	PostgreSQL connection string
CERTCTL_DATABASE_MAX_CONNS	25	Connection pool size
CERTCTL_LOG_LEVEL	info	Log level: debug, info, warn, error
CERTCTL_LOG_FORMAT	json	Log format: json or text
CERTCTL_AUTH_TYPE	api-key	Auth mode: api-key, jwt, or none
CERTCTL_AUTH_SECRET	—	Required for api-key and jwt auth types
CERTCTL_KEYGEN_MODE	agent	Key generation mode: agent (production) or server (demo only)
CERTCTL_ACME_DIRECTORY_URL	—	ACME directory URL (e.g., Let's Encrypt staging)
CERTCTL_ACME_EMAIL	—	Contact email for ACME account registration

Agent environment variables:

Variable	Default	Description
CERTCTL_SERVER_URL	http://localhost:8080	Control plane URL
CERTCTL_API_KEY	—	Agent API key
CERTCTL_AGENT_NAME	certctl-agent	Agent display name
CERTCTL_AGENT_ID	—	Registered agent ID (required)
CERTCTL_KEY_DIR	/var/lib/certctl/keys	Directory for storing private keys (agent keygen mode)

Docker Compose overrides these for the demo stack (see deploy/docker-compose.yml): port 8443, auth type none, database pointing to the postgres container.

API Overview

All endpoints are under /api/v1/ and return JSON. List endpoints support pagination (?page=1&per_page=50).

Certificates

GET    /api/v1/certificates              List (filter: status, environment, owner_id, team_id)
POST   /api/v1/certificates              Create
GET    /api/v1/certificates/{id}          Get
PUT    /api/v1/certificates/{id}          Update
DELETE /api/v1/certificates/{id}          Archive (soft delete)
GET    /api/v1/certificates/{id}/versions Version history
POST   /api/v1/certificates/{id}/renew    Trigger renewal → 202 Accepted
POST   /api/v1/certificates/{id}/deploy   Trigger deployment → 202 Accepted

Agents

GET    /api/v1/agents                     List
POST   /api/v1/agents                     Register
GET    /api/v1/agents/{id}                Get
POST   /api/v1/agents/{id}/heartbeat      Record heartbeat
POST   /api/v1/agents/{id}/csr            Submit CSR for issuance
GET    /api/v1/agents/{id}/certificates/{certId}  Retrieve signed certificate
GET    /api/v1/agents/{id}/work            Poll for pending deployment jobs
POST   /api/v1/agents/{id}/jobs/{jobId}/status  Report job completion/failure

Infrastructure

GET    /api/v1/issuers                    List issuers
POST   /api/v1/issuers                    Create
GET    /api/v1/issuers/{id}               Get
POST   /api/v1/issuers/{id}/test          Test connectivity

GET    /api/v1/targets                    List deployment targets
POST   /api/v1/targets                    Create
GET    /api/v1/targets/{id}               Get

Organization

GET    /api/v1/teams                      List teams
POST   /api/v1/teams                      Create
GET    /api/v1/owners                     List owners
POST   /api/v1/owners                     Create

Operations

GET    /api/v1/jobs                       List (filter: status, type)
GET    /api/v1/jobs/{id}                  Get
POST   /api/v1/jobs/{id}/cancel           Cancel

GET    /api/v1/policies                   List policy rules
POST   /api/v1/policies                   Create
GET    /api/v1/policies/{id}/violations   List violations for rule

GET    /api/v1/audit                      Query audit trail
GET    /api/v1/notifications              List notifications

Health

GET    /health                            Server health check
GET    /ready                             Readiness check

Supported Integrations

Certificate Issuers

Issuer	Status	Type
Local CA (self-signed)	Implemented	GenericCA
ACME v2 (Let's Encrypt, Sectigo)	Implemented (HTTP-01)	ACME
Vault PKI	Planned	—
DigiCert	Planned	—

Deployment Targets

Target	Status	Type
NGINX	Implemented	NGINX
F5 BIG-IP	Implemented	F5
Microsoft IIS	Implemented	IIS
Kubernetes Secrets	Planned	—

Notifiers

Notifier	Status	Type
Email (SMTP)	Implemented	Email
Webhooks	Implemented	Webhook
Slack	Planned	—

Development

# Install dev tools (golangci-lint, migrate CLI, air)
make install-tools

# Run tests
make test

# Run with coverage
make test-coverage

# Lint
make lint

# Format
make fmt

Docker Compose

make docker-up          # Start stack (server + postgres + agent)
make docker-down        # Stop stack
make docker-logs-server # Server logs
make docker-logs-agent  # Agent logs
make docker-clean       # Stop + remove volumes

Security

Private Key Management

• Agent keygen mode (default): Agents generate ECDSA P-256 keys locally and store them with 0600 permissions in CERTCTL_KEY_DIR (default /var/lib/certctl/keys). Only the CSR (public key) is sent to the control plane. Private keys never leave agent infrastructure.
• Server keygen mode (demo only): Set CERTCTL_KEYGEN_MODE=server for development/demo with Local CA. The control plane generates RSA-2048 keys server-side. A log warning is emitted at startup.

Authentication

• Agent-to-server: API key (registered at agent creation)
• API key and JWT auth types supported; none for demo/development
• Auth type and secret configured via CERTCTL_AUTH_TYPE and CERTCTL_AUTH_SECRET

Audit Trail

• Immutable append-only log in PostgreSQL (audit_events table)
• Every action attributed to an actor with timestamp and resource reference
• No update or delete operations on audit records

Roadmap

V1 (feature-complete → v1.0.0 tag pending)

All nine development milestones (M1–M9) are complete. The backend covers the full certificate lifecycle: Local CA and ACME v2 issuers, NGINX/F5/IIS target connectors, threshold-based expiration alerting, agent-side ECDSA P-256 key generation, API auth with rate limiting, and a React dashboard with 11 views wired to the real API. The CI pipeline runs build, vet, lint, test with coverage gates (service layer 30%+, handler layer 50%+), and frontend checks on every push. 170+ tests across service, handler, integration, and connector layers.

Remaining before the v1.0.0 tag: dashboard screenshots in README, tagged Docker images published, final error-handling audit to confirm no panics or unhandled error paths.

V2: Operational Maturity

• V2.0: Operational Workflows — renewal approval UI, bulk cert operations, deployment timeline, real-time updates (SSE/WebSocket), target config wizard
• V2.1: Team Adoption — OIDC/SSO, RBAC, CLI tool, Slack/Teams notifiers, bulk cert import
• V2.2: Observability — expiration calendar, health scores, Prometheus metrics, deployment rollback

V3: Discovery & Visibility

Certificate discovery (passive/active scanning), unknown cert detection, triage workflows in GUI

V4+: Platform & Scale

Kubernetes CRD, Terraform provider, multi-region, HA control plane, HSM support

License

Certctl is licensed under the Business Source License 1.1. The source code is publicly available and free to use, modify, and self-host. The one restriction: you may not offer certctl as a managed/hosted certificate management service to third parties.

On March 14, 2033 (7 years from initial release), the license automatically converts to Apache License 2.0 and all restrictions are removed.

For commercial licensing inquiries, contact skreddy040@gmail.com.