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CMC (RFC 2797)

CMC (RFC 2797). Michael Myers VeriSign, Inc. mmyers@verisign.com. Objectives. Industry de-facto standard use of PKCS-10 for certificate requests and PKCS-7 for responses. Primary objectives: Simplify online certificate management by building on existing PKCS7 and PKCS10 practice.

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CMC (RFC 2797)

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  1. CMC (RFC 2797) Michael Myers VeriSign, Inc. mmyers@verisign.com

  2. Objectives • Industry de-facto standard use of PKCS-10 for certificate requests and PKCS-7 for responses. • Primary objectives: • Simplify online certificate management by building on existing PKCS7 and PKCS10 practice. • Reuse existing security encapsulation mechanism then being standardized as CMS in the IETF. • Define core functions useful for automated certificate management. • Straw poll of WG at San Jose IETF ratified the need for an alternative.

  3. Background • VeriSign, Cisco started work earlier. • Went through several variations (including a draft called Certificate Request Syntax (CRS)). • Emerged as Certificate Management over CMS (CMC) with Certificate Request Message Format (CRMF) as a by-product. • Brian LaMacchia and Jim Schaad are principal technical architects of final versions. • Now RFC 2797.

  4. Top-Level Requirements • Based as much as possible on the existingCMS, PKCS#10 and CRMF specifications. • Support the current industry practice of aPKCS#10 request followed by a PKCS#7 response as a subset of theprotocol. • Must easily support the multi-key enrollmentprotocols required by S/MIME and other groups. • Must supply a way of doing operations in asingle-round trip whenever possible. • Enable all key generation to occur on the client. • Support mandatory and optional algorithms. • Support pending responses to certificate requests for cases where external procedures are required to issue a certificate. • Support Registration Authorities.

  5. Protocol Overview • Standardizes use of bare PKCS-10 for environments with a need for it. • Defines a means to “wrap a 10 in a 7”. • i.e use of CMS to encapsulate the PKCS 10 object. • May also use CRMF instead of a 10. • Responses based on CMS signedData. • Again, this could be nothing more than a “7”. • Or a responseBody in a CMS encapsulation.

  6. Services • Issuance (direct and deferred) • Revocation • Registration authority intervention • Certificate/CRL retrieval • Replay detection through nonces • Transaction management through transaction IDs.

  7. Simple request/response Simple PKI Request Simple PKI Response ------------------------- -------------------------- +----------+ +------------------+ | PKCS #10 | | CMS "certs-only" | +----------+--------------+ | message | | | +------------------+------+ | Certificate Request | | | | | | CMS Signed Data, | | Subject Name | | no signerInfo | | Subject Public Key Info | | | | (K_PUB) | | signedData contains one | | Attributes* | | or more certificates in | | | | the "certificates" | +-----------+-------------+ | portion of the | | signed with | | signedData. | | matching | | | | K_PRIV | | encapsulatedContentInfo | +-------------+ | is empty. | | | +--------------+----------+ | unsigned | +----------+

  8. Full Request/Response +----------------+ +----------------+ | CMS signedData | | CMS signedData | | object | | object | +----------------+--------+ +----------------+--------+ | | | | | PKIData object | | ResponseBody object | | | | | | Sequence of: | | Sequence of: | | <enrollment attribute>* | | <enrollment attribute>* | | <certification request>*| | <CMS object>* | | <CMS objects>* | | <other message>* | | <other message>* | | | | | | where * == zero or more | | where * == zero or more | | | | | | All certificates issued | | Certificate requests | | as part of the response | | are CRMF or PKCS#10 | | are included in the | | objects. Attributes are | | "certificates" portion | | (OID, ANY defined by | | of the signedData. | | OID) pairs. | | Relevant CA certs and | | | | CRLs can be included as | +-------+-----------------+ | well. | | signed (keypair | | | | used may be pre-| +---------+---------------+ | existing or | | signed by the | | identified in | | CA or an LRA | | the request) | +---------------+ +-----------------+

  9. Control Attributes Control Attribute OID Syntax ----------------- ---------- -------------- cMCStatusInfo id-cmc 1 CMCStatusInfo identification id-cmc 2 UTF8String identityProof id-cmc 3 OCTET STRING dataReturn id-cmc 4 OCTET STRING transactionId id-cmc 5 INTEGER senderNonce id-cmc 6 OCTET STRING recipientNonce id-cmc 7 OCTET STRING addExtensions id-cmc 8 AddExtensions encryptedPOP id-cmc 9 EncryptedPOP decryptedPOP id-cmc 10 DecryptedPOP lraPOPWitness id-cmc 11 LraPOPWitness getCert id-cmc 15 GetCert getCRL id-cmc 16 GetCRL revokeRequest id-cmc 17 RevokeRequest regInfo id-cmc 18 OCTET STRING responseInfo id-cmc 19 OCTET STRING QueryPending id-cmc 21 OCTET STRING idPOPLinkRandom id-cmc 22 OCTET STRING idPOPLinkWitness id-cmc 23 OCTET STRING idConfirmCertAcceptance id-cmc 24 CMCCertId

  10. A few other technical details • Subscriber privacy achieved through use of CMS enveloped data mechanisms. • Three transport wrapping options • MIME for HTTP and email • Binary for out of band floppy disk transfer (either bare or MIME) • Socket-based using the raw BER encoding. • Able to prove identity based on a shared secret. • Able to prove possession of encryption-only keys. • Able to link identity proof to possession proof.

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