A PKI/TLS toolkit for signing, verifying, and bundling TLS certificates, available as a CLI tool and HTTP API server.
CFSSL is an open-source PKI/TLS toolkit developed by Cloudflare that provides a comprehensive suite of tools for managing TLS certificates. It functions as both a command-line utility and an HTTP API server, enabling developers to sign, verify, bundle, and generate certificates efficiently. It solves the complexity of building and operating custom Public Key Infrastructure by offering a modular, programmatic approach to certificate lifecycle management.
System administrators, DevOps engineers, and security professionals who need to automate TLS certificate issuance, manage internal CAs, or integrate PKI operations into their infrastructure.
Developers choose CFSSL for its dual CLI and API interface, its flexibility in supporting both local and remote signing operations, and its robust feature set including multi-root CA support and OCSP handling—all packaged in a single, Go-based toolkit.
CFSSL: Cloudflare's PKI and TLS toolkit
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Offers both command-line tools and an HTTP API server, enabling seamless automation and integration into DevOps pipelines, as demonstrated by the 'cfssl serve' command and documented API endpoints.
Includes the 'multirootca' program for using multiple signing keys, facilitating complex PKI hierarchies and redundancy in certificate issuance for enterprise environments.
Covers the full certificate lifecycle—from key generation and CSR creation to signing, bundling, and OCSP handling—providing a one-stop solution for PKI management.
Requires Go 1.20+ and cgo to build, with noted incompatibilities on RHEL-based systems, making installation non-trivial for users without Go expertise or on restricted environments.
Documentation is limited to text files (e.g., 'doc/api/intro.txt') and lacks interactive tutorials or detailed examples, which can increase the learning curve for new users.
Relies entirely on CLI and API interfaces, missing graphical management consoles that could simplify certificate oversight for less technical teams.