Package: acme-mgmtserver
ACME Management Server (ACMEMS)LetsEncryptsupports 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 clientSome 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-challengesrequests 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-challengesrequests.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.Domain Validations / Challenges.HTTP01The normal webserver must be adjusted to forward.well-known/acme-challengesrequests to the ACME Management Server - this is a prerequirement and will not be checked/enforced/configured by this tool.Nginxupstream acme-mgmtserver {
    server ...;
}
server {
    # ...
    location /.well-known/acme-challenge {
        proxy_set_header Host $http_host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_pass http://acme-mgmtserver;
        # to support multiple acme mgmt server check challenge on all upstream server:
        proxy_next_upstream error timeout http_404;
    }
    # ...
}This passes all ACME challenges to the management server.proxy_next_upstream http_404;can be used to support multiple ACME management servers and search for the response on all servers.ApacheUp to you - I am happy to accept a PR to complete this.TLSNI01TLSNI01is currently not supported, but there are few things are missing. Feel free to open a PR or talk to me if you have use for this challenge type.DNS01ACMEMS can instrument DNS servers to serve the neededTXTrecords to validate domain names viaDNS01challenge. The DNS servers will be updated vis DNS update. Currently there is no security for the updates implemented. We expect that the zone name managed by the name server are second-level domain name (likeexample.org).InstallationDebian PackagesMy preferred installation method are distribution packages. I try to published a packaged version in my ownPPA. To goal is to support the current LTS version and the previous version for a upgrade period. The software dependencies should be directly available as distribution packages.PyPIThe server and all its dependencies are available on PyPi and can be installed by Python package manager like pip e.g. inside a virtualenv.ConfigurationThe configuration is a basic INI file, with multiple key support. The main parts are the blocks to define the account directory, listen information for the http interfaces and the configuration which client is allowed to request certificates for which domains.[account]# the ACME server to talk to; I recommend to first test# against the staging systemacme-server=https://acme-staging.api.letsencrypt.org/directory# account dir; contains#   account.pem - private key to identify against the ACME server#   registration.json - the registration resource as JSON dumpdir=/etc/acmems/account/[mgmt]# Management interface itself, the clients needs to talk to thismgmt=192.0.2.13:1313# maximal size for CSR (in bytes)max-size=4k# define which verification block is used by defaultdefault-verification=http# should signed certificates be cached? if yes, how?default-storage=file# Define verification blocks[verification"http"]# the challenge type has to be defined first!type=http01# listen for HTTP challenge check requests (e.g. from Nginx)listener=192.0.2.80:1380listener=198.51.100.80:1380listener=[fe80::80%eth0]:1380[verification"dns"]# the challenge type has to be defined first!type=dns01-dnsUpdate# which name server needs to be updated nowdns-server=192.0.2.53# time-to-live for the new entriesttl=5# timeout for dns update requeststimeout=30# Storages[storage"none"]# this stores nothing and it is the default storagetype=none[storage"file"]# caching on disk, the directory must be writeable for the daemontype=filedirectory=/etc/acmems/storage# cached certificates will be treated outdated if their expire date is less# than $renew-within$ days away. A new certificate will be issued for the# passed CSR, stored and returned in subsequencial requests# defaults to 14 days - around 30 days is recommended by letsencryptrenew-within=14# Define multiple authentification blocks# a CSR must fulfil all listed authentication methods and must# only contains listed domains (checks against globs)[auth"mail"]# TCP connection must come from one of this IPsip=192.0.2.0/24ip=198.51.100.21domain=mail.example.orgdomain=mail.example.com# an additional auth block[auth"ext"]ip=198.51.100.128/28domain=*.test.example.org# CSR must also be signed by HMAC (via a the secret key)[auth"mail-secure"]# use special verification and storageverification=dnsstorage=fileip=198.51.100.21hmac_type=sha256hmac_key=A1YP67armNf3cBrecyJHdb035domain=mail?.example.orgdomain=mail.example.comRegistrationThe executableacme-registersupports to register at the ACME server. This will not be done automatically, you have to call it manually before the first use of the server itself.Please have a look at the help output for further instructionsacme-register --help.A registration could look like this:>bin/acme-register--gen-key--register--emailtest@example.orgconfigs/integration.ini
Generateprivatekey...doneInitializeACMEclient...doneRegister...doneYouneedtoacceptthetermsofserviceathttp://127.0.0.1:4001/terms/v1
>bin/acme-register--accept-terms-of-service=http://127.0.0.1:4001/terms/v1configs/integration.ini
Loadprivatekey...doneInitializeACMEclient...doneRefreshingcurrentregistration...doneYouneedtoacceptthetermsofserviceathttp://127.0.0.1:4001/terms/v1
AcceptingToSathttp://127.0.0.1:4001/terms/v1...doneExample Client Usage# generate domain private key (once!)
openssl genrsa 4096 > domain.key

# generate csr to create/renew your certificate
# please generate a new csr for to renew your certificate
openssl req -new -sha256 -key domain.key -subj "/CN=example.org" > domain-201512.csr
# or
openssl req -new -sha256 -key domain.key -subj "/CN=example.org" -reqexts SAN -config <(cat /etc/ssl/openssl.cnf <(printf "[SAN]\nsubjectAltName=DNS:example.org,DNS:www.example.org")) > domain-201512.csr

# upload sign csr with shared key
wget --post-file=domain-201512.csr --header="`openssl dgst -sha256 -hmac '$KEY' domain-201512.csr | sed -e 's/HMAC-\(.*\)(.*)= *\(.*\)/Authentication: hmac name=\L\1\E, hash=\2/'`" http://acmese:1313/sign > domain-201512.pem
# upload csr with out sign
wget --post-file=domain-201512.csr http://acmese:1313/sign > domain-201512.pemHTTP interfaceClient requestOnly POST requests to/signare supported.The body must be a CSR as PEM format;Content-Lengthheader is required,Content-Typeis currently not evaluated.To authentication the CSR via HMAC, add a header like:Authentication: hmac name=sha256 hash=47d5066525a214c759300d884bdd19d8f461a0ad24a2a0b7b705caee6c912228A complete request could look like:POST /sign HTTP/1.1
Host: 127.0.0.1:4005
Content-Length: 1586
Authentication: hmac name=sha256, hash=47d5066525a214c759300d884bdd19d8f461a0ad24a2a0b7b705caee6c912228

-----BEGIN CERTIFICATE REQUEST-----
MIIEWjCCAkICAQAwFTETMBEGA1UEAwwKZ28uZHh0dC5kZTCCAiIwDQYJKoZIhvcN
AQEBBQADggIPADCCAgoCggIBAOWXle7/dEo7l/h9O14w2ndsoKmzpHXcfosSyZnK
qrMoJLSKQImm0Y0ACRggs+c4oTbGeyUgm44RmmPjBoFxdL41CHTp5YHOytaYQHUz
A1wCitOzEMuPgRqvLUc4SqgjC7fOk1EP0bUX1YIrGNz40sYy5AsVINp4ZzKFfMoR
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oFnkHHKNGndYA6e0ov/WxHtXqxKrmsp7IN99sCvtwcoi8Kuf2OWE8/MuebsDRUCI
fhCXCsGU+2+99qan70fL7o+VmZTwBGr3GHtjJ5+QthJ92oH6uXsS+AamyhyLpp1V
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NdZtAgMBAAGgADANBgkqhkiG9w0BAQsFAAOCAgEAOK5sq1dtr8SxSxbhaib+b/hz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-----END CERTIFICATE REQUEST-----Server responseError code:200: CSR was signed. Response body contains the certificate and the intermediate certificate in PEM form.403: Signing is denied, have a look at your auth blocks / authentication methods; are you missing anAuthenticationheader?413: CSR request is too long. You might increase themax-sizesetting.415: CSR could not be parsed.421: Challenge validation failed (temporarily)429: Rated limited (currently only based on ACME upstream errors)500: Internal exception - take a look at the log and report the bug.TestingThe server is tested by unit tests, integration tests against test ACME servers (BoulderandPebble) and with end-to-end tests. All major features should be covered like authentication, HTTP requests, validation methods (HTTP01, DNS01), different CSR and certificate algorithms (RSA and EC).The test are exectued bypy.test.docker-composeis used to run the ACME servers. Take a look attests/scriptsto inspect the commands, that are run on TravisCI.ContributingFork itCreate your feature branch (git checkout -b my-new-feature)Add tests for your feature.Add your feature.Commit your changes (git commit -am 'Add some feature')Push to the branch (git push origin my-new-feature)Create new Pull RequestLicenseGPL LicenseCopyright (c) 2015-2019, Malte Swart