Internet Assigned Numbers Authority

Automated Certificate Management Environment (ACME) Protocol

Created
2019-01-02
Last Updated
2024-02-02
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Registries included below

ACME Account Object Fields

Registration Procedure(s)
Specification Required
Expert(s)
Richard Barnes
Reference
[RFC8555]
Available Formats

CSV
Field Name Field Type Requests Reference
status string new, account [RFC8555]
contact array of string new, account [RFC8555]
externalAccountBinding object new [RFC8555]
termsOfServiceAgreed boolean new [RFC8555]
onlyReturnExisting boolean new [RFC8555]
orders string none [RFC8555]
delegations string none [RFC9115]

ACME Order Object Fields

Registration Procedure(s)
Specification Required
Expert(s)
Richard Barnes
Reference
[RFC8555]
Available Formats

CSV
Field Name Field Type Configurable Reference
status string false [RFC8555]
expires string false [RFC8555]
identifiers array of object true [RFC8555]
notBefore string true [RFC8555]
notAfter string true [RFC8555]
error string false [RFC8555]
authorizations array of string false [RFC8555]
finalize string false [RFC8555]
certificate string false [RFC8555]
auto-renewal object true [RFC8739]
star-certificate string false [RFC8739]
allow-certificate-get boolean true [RFC9115]
delegation string true [RFC9115]

ACME Authorization Object Fields

Registration Procedure(s)
Specification Required
Expert(s)
Richard Barnes
Reference
[RFC8555]
Available Formats

CSV
Field Name Field Type Configurable Reference
identifier object true [RFC8555]
status string false [RFC8555]
expires string false [RFC8555]
challenges array of object false [RFC8555]
wildcard boolean false [RFC8555]
subdomainAuthAllowed boolean false [RFC9444]

ACME Error Types

Registration Procedure(s)
Specification Required
Expert(s)
Richard Barnes
Reference
[RFC8555]
Available Formats

CSV
Type Description Reference
accountDoesNotExist The request specified an account that does not exist [RFC8555]
alreadyRevoked The request specified a certificate to be revoked that has already been revoked [RFC8555]
badCSR The CSR is unacceptable (e.g., due to a short key) [RFC8555]
badNonce The client sent an unacceptable anti-replay nonce [RFC8555]
badPublicKey The JWS was signed by a public key the server does not support [RFC8555]
badRevocationReason The revocation reason provided is not allowed by the server [RFC8555]
badSignatureAlgorithm The JWS was signed with an algorithm the server does not support [RFC8555]
caa Certification Authority Authorization (CAA) records forbid the CA from issuing a certificate [RFC8555]
compound Specific error conditions are indicated in the "subproblems" array [RFC8555]
connection The server could not connect to validation target [RFC8555]
dns There was a problem with a DNS query during identifier validation [RFC8555]
externalAccountRequired The request must include a value for the "externalAccountBinding" field [RFC8555]
incorrectResponse Response received didn't match the challenge's requirements [RFC8555]
invalidContact A contact URL for an account was invalid [RFC8555]
malformed The request message was malformed [RFC8555]
orderNotReady The request attempted to finalize an order that is not ready to be finalized [RFC8555]
rateLimited The request exceeds a rate limit [RFC8555]
rejectedIdentifier The server will not issue certificates for the identifier [RFC8555]
serverInternal The server experienced an internal error [RFC8555]
tls The server received a TLS error during validation [RFC8555]
unauthorized The client lacks sufficient authorization [RFC8555]
unsupportedContact A contact URL for an account used an unsupported protocol scheme [RFC8555]
unsupportedIdentifier An identifier is of an unsupported type [RFC8555]
userActionRequired Visit the "instance" URL and take actions specified there [RFC8555]
autoRenewalCanceled The short-term certificate is no longer available because the auto-renewal Order has been explicitly canceled by the IdO [RFC8739]
autoRenewalExpired The short-term certificate is no longer available because the auto-renewal Order has expired [RFC8739]
autoRenewalCancellationInvalid A request to cancel an auto-renewal Order that is not in state "valid" has been received [RFC8739]
autoRenewalRevocationNotSupported A request to revoke an auto-renewal Order has been received [RFC8739]
unknownDelegation An unknown configuration is listed in the delegation attribute of the order request [RFC9115]
onionCAARequired The CA only supports checking CAA for hidden services in-band, but the client has not provided an in-band CAA [draft-ietf-acme-onion-01]

ACME Resource Types

Registration Procedure(s)
Specification Required
Expert(s)
Richard Barnes
Reference
[RFC8555]
Available Formats

CSV
Field Name Resource Type Reference
newNonce New nonce [RFC8555]
newAccount New account [RFC8555]
newOrder New order [RFC8555]
newAuthz New authorization [RFC8555]
revokeCert Revoke certificate [RFC8555]
keyChange Key change [RFC8555]
meta Metadata object [RFC8555]

ACME Directory Metadata Fields

Registration Procedure(s)
Specification Required
Expert(s)
Richard Barnes
Reference
[RFC8555]
Available Formats

CSV
Field Name Field Type Reference
termsOfService string [RFC8555]
website string [RFC8555]
caaIdentities array of string [RFC8555]
externalAccountRequired boolean [RFC8555]
auto-renewal object [RFC8739]
delegation-enabled boolean [RFC9115]
allow-certificate-get boolean [RFC9115]
subdomainAuthAllowed boolean [RFC9444]
onionCAARequired boolean [draft-ietf-acme-onion-01]

ACME Identifier Types

Registration Procedure(s)
Specification Required
Expert(s)
Richard Barnes
Reference
[RFC8555]
Available Formats

CSV
Label Reference
dns [RFC8555]
ip [RFC8738]
email [RFC8823][RFC5321][RFC6531]
TNAuthList [RFC9448]

ACME Validation Methods

Registration Procedure(s)
Specification Required
Expert(s)
Richard Barnes
Reference
[RFC8555]
Available Formats

CSV
Label Identifier Type ACME Reference
http-01 dns Y [RFC8555]
dns-01 dns Y [RFC8555]
tls-sni-01 RESERVED N [RFC8555]
tls-sni-02 RESERVED N [RFC8555]
http-01 ip Y [RFC8738]
tls-alpn-01 ip Y [RFC8738]
tls-alpn-01 dns Y [RFC8737]
email-reply-00 email Y [RFC8823]
tkauth-01 TNAuthList Y [RFC9447]
onion-csr-01 dns Y [draft-ietf-acme-onion-01]

ACME Order Auto-Renewal Fields

Registration Procedure(s)
Specification Required
Expert(s)
Yaron Sheffer, Diego R. Lopez, Thomas Fossati
Reference
[RFC8739]
Available Formats

CSV
Field Name Field Type Configurable Reference
start-date string true [RFC8739]
end-date string true [RFC8739]
lifetime integer true [RFC8739]
lifetime-adjust integer true [RFC8739]
allow-certificate-get boolean true [RFC8739]

ACME Directory Metadata Auto-Renewal Fields

Registration Procedure(s)
Specification Required
Expert(s)
Yaron Sheffer, Diego R. Lopez, Thomas Fossati
Reference
[RFC8739]
Available Formats

CSV
Field Name Field Type Reference
min-lifetime integer [RFC8739]
max-duration integer [RFC8739]
allow-certificate-get boolean [RFC8739]

STAR Delegation CSR Template Extensions

Registration Procedure(s)
Specification Required
Expert(s)
Yaron Sheffer, Diego R. Lopez, Thomas Fossati
Reference
[RFC9115]
Available Formats

CSV
Extension Name Extension Syntax and Reference Mapping to X.509 Certificate Extension
keyUsage [RFC9115, Appendix A] [RFC5280, Section 4.2.1.3]
extendedKeyUsage [RFC9115, Appendix A] [RFC5280, Section 4.2.1.12]
subjectAltName [RFC9115, Appendix A] [RFC5280, Section 4.2.1.6] (note that only specific name formats are allowed: URI, DNS name, email address)

ACME Authority Token Challenge Types

Registration Procedure(s)
Specification Required
Expert(s)
Mary Barnes
Reference
[RFC9447]
Available Formats

CSV
Label Description Reference
atc JSON Web Token (JWT) challenge type [RFC9447]