certmesh 3.0.2

Multi-provider TLS certificate lifecycle management — DigiCert, Venafi TPP, Vault PKI, ACM, Let's Encrypt

certmesh

Automated TLS certificate lifecycle management for Python 3.10+.

A unified CLI and Python API for managing certificates across DigiCert CertCentral, Venafi Trust Protection Platform, HashiCorp Vault PKI, and AWS Certificate Manager (public + private CA).

Features

• Multi-provider -- single tool for DigiCert, Venafi TPP, Vault PKI, AWS ACM/ACM-PCA, and Let's Encrypt
• Full lifecycle -- request, list, search, describe, download, renew, revoke, and export certificates
• REST API -- production-grade FastAPI service with OAuth2 (ADFS / Azure Entra ID), Prometheus metrics
• Credential security -- secrets come from Vault (KV v1/v2) or environment variables, never from config files
• Resilient -- circuit breakers, exponential-backoff retry, and configurable timeouts on all HTTP calls
• Configurable -- layered config: built-in defaults < YAML file < CM_* environment variables
• Cloud-native -- Docker image, Helm chart for EKS with IRSA, NLB, HPA, and Vault PKI TLS
• Typed -- fully typed with py.typed marker; dataclass models for all API responses

Installation

pip install certmesh

From source:

git clone https://github.com/SCGIS-Wales/certmesh.git
cd certmesh
pip install -e ".[dev]"

Requires Python 3.10, 3.11, 3.12, 3.13, or 3.14.

Quick Start

# Show effective config
certmesh config show

# Issue a certificate from Vault PKI
certmesh vault-pki issue --cn myservice.example.com --ttl 720h

# Request a public ACM certificate
certmesh acm request --cn myapp.example.com --validation DNS

# List DigiCert certificates
certmesh digicert list --status issued

# Renew a Venafi TPP certificate
certmesh venafi renew --guid "a1b2c3d4-e5f6-7890-abcd-ef1234567890"

Configuration

Configuration is layered (lowest to highest precedence):

1. Built-in defaults -- sensible defaults for all settings
2. YAML config file -- config/config.yaml or --config PATH
3. CM_* environment variables -- override any setting

# Use a .env file
certmesh --env-file .env digicert list

# Override log level
certmesh --log-level DEBUG acm list

See config/config.yaml for the full annotated reference and .env.example for all environment variables.

Authentication

Provider	Method
Vault	AppRole (default), LDAP, or AWS IAM
DigiCert	API key from CM_DIGICERT_API_KEY or Vault KV
Venafi	OAuth2 or LDAP; credentials from CM_VENAFI_USERNAME/CM_VENAFI_PASSWORD or Vault KV
AWS ACM	Standard boto3 credential chain (IAM role, env vars, ~/.aws/credentials)
Let's Encrypt	ACME account key (auto-generated or provided)

Credentials are resolved env-first, Vault-fallback. Vault is only contacted when needed.

CLI Reference

Exit codes: 0 = success, 1 = config/auth error, 2 = cert operation error, 3 = unexpected error.

DigiCert CertCentral

certmesh digicert list     [--status TEXT] [--limit INT]
certmesh digicert search   [--cn TEXT] [--serial TEXT] [--status TEXT] [--product TEXT]
certmesh digicert describe --cert-id INT
certmesh digicert order    --cn TEXT [--san TEXT ...]
certmesh digicert download --cert-id INT --key-file PATH
certmesh digicert revoke   --cert-id INT|--order-id INT [--reason CHOICE] [--comments TEXT]
certmesh digicert duplicate --order-id INT --csr-file PATH [--cn TEXT] [--san TEXT ...]

Venafi TPP

certmesh venafi list       [--limit INT] [--offset INT]
certmesh venafi search     [--cn TEXT] [--san TEXT]
certmesh venafi describe   --guid TEXT
certmesh venafi request    --policy-dn TEXT --cn TEXT [--san TEXT ...] [--client-csr]
certmesh venafi renew      --guid TEXT
certmesh venafi renew-bulk --guid-file PATH
certmesh venafi revoke     --dn TEXT|--thumbprint TEXT [--reason INT] [--disable]
certmesh venafi download   --guid TEXT

HashiCorp Vault PKI

certmesh vault-pki issue   --cn TEXT [--san TEXT ...] [--ip-san TEXT ...] [--ttl TEXT] [--output-dir PATH]
certmesh vault-pki sign    --cn TEXT --csr-file PATH [--san TEXT ...] [--ttl TEXT] [--output-dir PATH]
certmesh vault-pki list
certmesh vault-pki read    --serial TEXT
certmesh vault-pki revoke  --serial TEXT

AWS ACM (Public Certificates)

certmesh acm request           --cn TEXT [--san TEXT ...] [--validation DNS|EMAIL] [--key-algorithm TEXT] [--region TEXT]
certmesh acm list              [--status TEXT ...] [--region TEXT]
certmesh acm describe          --arn TEXT [--region TEXT]
certmesh acm export            --arn TEXT --passphrase [--output-dir PATH] [--region TEXT]
certmesh acm renew             --arn TEXT [--region TEXT]
certmesh acm delete            --arn TEXT [--region TEXT]
certmesh acm validation-records --arn TEXT [--region TEXT]
certmesh acm wait              --arn TEXT [--region TEXT]

AWS ACM Private CA

certmesh acm-pca issue   --ca-arn TEXT --csr-file PATH [--validity-days INT] [--signing-algorithm TEXT] [--region TEXT]
certmesh acm-pca get     --ca-arn TEXT --cert-arn TEXT [--region TEXT]
certmesh acm-pca revoke  --ca-arn TEXT --cert-arn TEXT --cert-serial TEXT [--reason CHOICE] [--region TEXT]
certmesh acm-pca list    --ca-arn TEXT [--region TEXT]

Config Management

certmesh config show       # Display effective merged config (secrets redacted)
certmesh config validate   # Validate config; exits 0 on success, 1 on failure

Architecture

certmesh/
  cli.py               -- Click CLI (entry point: certmesh.cli:cli)
  settings.py           -- Layered config: defaults -> YAML -> env vars
  credentials.py        -- Env-first, Vault-fallback secret resolution
  certificate_utils.py  -- Key gen, CSR, PKCS#12, bundle assembly, persistence
  circuit_breaker.py    -- Thread-safe CLOSED/OPEN/HALF_OPEN state machine
  exceptions.py         -- Full exception hierarchy
  providers/
    digicert_client.py  -- DigiCert CertCentral API v2
    venafi_client.py    -- Venafi TPP API (OAuth2 + LDAP)
    acm_client.py       -- AWS ACM + ACM-PCA (boto3)
    letsencrypt_client.py -- Let's Encrypt / ACME (RFC 8555)
  backends/
    vault_client.py     -- Vault auth + KV v1/v2 + PKI engine
    secrets_manager_client.py -- AWS Secrets Manager
    route53_client.py   -- Route53 DNS record management
  api/
    app.py              -- FastAPI application factory
    auth.py             -- OAuth2 JWT Bearer validation
    routes/             -- REST API endpoints
    metrics.py          -- Prometheus metrics

Certificate Output

Issued certificates can be persisted to:

• Filesystem -- PEM files with private keys written mode 0600
• Vault KV v1/v2 -- certificate material stored as a KV secret (versioned or unversioned)
• AWS Secrets Manager -- certificate bundle stored as a JSON secret
• Multiple destinations -- any combination of the above

Configured per-provider via output.destination (list or legacy string: filesystem, vault, secrets_manager, or both).

Development

# Clone and install
git clone https://github.com/SCGIS-Wales/certmesh.git
cd certmesh
python -m venv .venv && source .venv/bin/activate
pip install -e ".[dev]"

# Run tests
pytest -v --cov=certmesh

# Lint and format
ruff check src/ tests/
ruff format src/ tests/

Docker

docker build -t certmesh .
docker run --rm certmesh --help

# Run the REST API
docker run -p 8000:8000 -e CM_CONFIG_FILE=/app/config.yaml certmesh

Helm Chart

helm install certmesh helm/certmesh \
  --set serviceAccount.annotations."eks\.amazonaws\.com/role-arn"=arn:aws:iam::123456789012:role/certmesh

See helm/certmesh/values.yaml for all configuration options.

AWS IAM Permissions

When running on AWS (EKS with IRSA, EC2, or Lambda), the IAM role needs the following permissions depending on which features are enabled:

AWS Certificate Manager (ACM)

{
  "Effect": "Allow",
  "Action": [
    "acm:RequestCertificate",
    "acm:DescribeCertificate",
    "acm:ListCertificates",
    "acm:DeleteCertificate",
    "acm:RenewCertificate",
    "acm:ExportCertificate",
    "acm:GetCertificate",
    "acm:ListTagsForCertificate",
    "acm:AddTagsToCertificate"
  ],
  "Resource": "*"
}

AWS ACM Private CA (ACM-PCA)

{
  "Effect": "Allow",
  "Action": [
    "acm-pca:IssueCertificate",
    "acm-pca:GetCertificate",
    "acm-pca:RevokeCertificate",
    "acm-pca:ListCertificateAuthorities",
    "acm-pca:DescribeCertificateAuthority",
    "acm-pca:GetCertificateAuthorityCertificate"
  ],
  "Resource": "*"
}

Route53 (ACM DNS Validation)

{
  "Effect": "Allow",
  "Action": [
    "route53:ChangeResourceRecordSets",
    "route53:ListHostedZones",
    "route53:GetHostedZone",
    "route53:ListResourceRecordSets"
  ],
  "Resource": [
    "arn:aws:route53:::hostedzone/*"
  ]
}

AWS Secrets Manager (Certificate Storage)

{
  "Effect": "Allow",
  "Action": [
    "secretsmanager:CreateSecret",
    "secretsmanager:PutSecretValue",
    "secretsmanager:GetSecretValue",
    "secretsmanager:DescribeSecret",
    "secretsmanager:UpdateSecret",
    "secretsmanager:TagResource"
  ],
  "Resource": "arn:aws:secretsmanager:*:*:secret:certmesh/*"
}

Vault AWS IAM Auth (STS)

{
  "Effect": "Allow",
  "Action": [
    "sts:AssumeRole",
    "sts:GetCallerIdentity"
  ],
  "Resource": "*"
}

Tip: For EKS deployments with IRSA, create a single IAM role with only the permissions you need, then reference it in your Helm values: serviceAccount.annotations."eks.amazonaws.com/role-arn".

Test Suite

• 538+ tests across the test suite
• 87%+ coverage (80% minimum enforced in CI)
• Tests use pytest, pytest-mock, responses, moto, and freezegun

CI

GitHub Actions runs on every push and PR:

Job	Matrix	Description
lint	Python 3.10 - 3.14	ruff check + ruff format --check
test	Python 3.10 - 3.14	pytest with coverage
build	Python 3.14	python -m build + twine check
docker-build	-	Docker image build + smoke test
auto-tag	-	Auto-version bump and tag on merge to main
publish-pypi	-	Publish to PyPI via trusted publisher

License

MIT -- see LICENSE for details.