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ACME Management Server (ACMEMS): Now "Macen"

Deprecated: The software has been rename to "Macen"! Please, update to that one to receive future updates.

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LetsEncrypt supports issuing free certificates by communication via ACME - the Automatically Certificate Management Evaluation protocol.

This tools is yet another ACME client ... but as a client/server model.

Why yet another ACME client

Some aspects are special:

  • ACME handling can be put into own VM / container ...: The server can be placed into an own VM, container, network segment to limit the security risk on compromised systems.
  • Only the server requires all the ACME dependencies: The clients require only a SSL tool like OpenSSL and a HTTP client like wget or curl, no python, no build tools. Python with python-acme and its dependencies (PyOpenSSL, Cryptography, ...) is only needed for the server.
  • Supports distributed web servers: All .well-known/acme-challenges requests for all domains can be served directly by the server. This makes it easy to validate domains when using multiple web server in distributed or fail-over fashion by forwarding all .well-known/acme-challenges requests.
  • Only the server needs the ACME account information: It is not that security relevant, but only the ACME Management Server needs access to the account information / key for the ACME server like LetsEncrypt.
  • Caching CSR signs: The returned signed certificate of a CSR is cached until the certificate is nearly expired (per default two week). If two machines have manual shared a key and CSR and they reusing both, they will both get from ACMEMS the same certificate back.

License

GPL License

Copyright (c) 2015-2025, Malte Swart

Metadata

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