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Bring profiles into the modern day
Overhaul Section 7.1 Profiles, with two goals in mind: - Removing deprecated pieces of our profiles, such as OCSP and the `Internet Security Research Group` Organization Name. - Giving them the same format as the profiles in Section 7.1 of the Baseline Requirements. Fixes #188 Fixes #304
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‎CP-CPS.md‎

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@@ -988,54 +988,115 @@ See [Section 5.5.5](#555-requirements-for-time-stamping-of-records).
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## 7.1 Certificate profile
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All fields are as specified in RFC 5280 and the Baseline Requirements, including fields and extensions not specifically mentioned.
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### Root CA Certificate
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| Field or extension | Value |
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| ------------------------------ | ------------------------------------------------------------------------|
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| Serial Number | Unique, with 64 bits of output from a CSPRNG |
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| Issuer Distinguished Name | C=US, O=Internet Security Research Group or O=ISRG, and a meaningful CN |
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| Subject Distinguished Name | Same as Issuer DN |
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| Validity Period | Up to 25 years |
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| Basic Constraints | cA=True, pathLength constraint absent (critical) |
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| Subject Public Key | See Sections 6.1.5, 6.1.6, and 7.1.3.1 |
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| Key Usage | keyCertSign, cRLSign (critical) |
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### Subordinate CA Certificate
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| Field or extension | Value |
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| ------------------------------ | ----------------------------------------------------------------------------- |
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| Serial Number | Unique, with 64 bits of output from a CSPRNG |
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| Issuer Distinguished Name | Derived from Issuer certificate |
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| Subject Distinguished Name | C=US, O=Let's Encrypt, and a meaningful CN |
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| Validity Period | Up to 8 years |
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| Basic Constraints | cA=True, pathLength constraint 0 (critical) |
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| Key Usage | keyCertSign, cRLSign, digitalSignature (critical) |
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| Extended Key Usage | TLS Server Authentication and optionally TLS Client Authentication |
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| Certificate Policies | CAB Forum Domain Validated (2.23.140.1.2.1) |
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| Authority Information Access | Contains CA Issuers URL and optionally an OCSP URL; URLs vary based on Issuer |
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| Subject Public Key | See Sections 6.1.5, 6.1.6, and 7.1.3.1 |
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| CRL Distribution Points | Contains a CRL URL; URL varies based on Issuer |
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### DV-SSL Subscriber Certificate
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| Field or extension | Value |
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| --------------------------------- | --------------------------------------------------------------------------------- |
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| Serial Number | Unique, with 64 bits of output from a CSPRNG |
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| Issuer Distinguished Name | Derived from Issuer certificate |
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| Subject Distinguished Name | CN=none, or one of the values from the Subject Alternative Name extension |
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| Validity Period | Up to 100 days |
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| Basic Constraints | cA=False (critical) |
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| Key Usage | digitalSignature, and optionally keyEncipherment (critical) |
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| Extended Key Usage | TLS Server Authentication and optionally TLS Client Authentication |
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| Certificate Policies | CAB Forum Domain Validated (2.23.140.1.2.1) |
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| Authority Information Access | Contains CA Issuers URL and optionally an OCSP URL; URLs vary based on Issuer |
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| Subject Public Key | See Sections 6.1.5, 6.1.6, and 7.1.3.1 |
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| Subject Alternative Name | A sequence of 1 to 100 dNSNames or ipAddresses (critical if no CN) |
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| Precertificate poison | Per RFC 6962 (precertificates only, critical) |
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| Signed Certificate Timestamp List | Per RFC 6962 (final certificates only) |
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| CRL Distribution Point | If present, contains a URI to the CRL shard whose scope includes this certificate |
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All certificates issued by ISRG are issued in accordance with exactly one of the following profiles.
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### Root CA Certificate Profile
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| **Field** | **Description** |
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| ---- | ------ |
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| `tbsCertificate` | |
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|     `version` | See Section 7.1.1 |
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|     `serialNumber` | Approximately 128 bits, including at least 64 bits of output from a CSPRNG |
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|     `signature` | See Section 7.1.3.2 |
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|     `issuer` | C=US, O=ISRG, and a meaningful CN |
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|     `validity` | At most 9132 days |
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|     `subject` | Byte-for-byte identical to the `issuer` field |
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|     `subjectPublicKeyInfo` | See Sections 6.1.5, 6.1.6, and 7.1.3.1 |
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|     `issuerUniqueID` | Not present |
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|     `subjectUniqueID` | Not present |
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|     `extensions` | |
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|         `basicConstraints` | Critical, with `cA` set to true |
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|         `keyUsage` | Critical, with the `keyCertSign` (5) and `cRLSign` (6) bits set |
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|         `subjectKeyIdentifier` | Contains a truncated hash of the `subjectPublicKey`, per RFC 7093, Section 2(2) |
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|         Any other extension | Not present |
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| `signatureAlgorithm` | Byte-for-byte identical to the `tbsCertificate.signature` |
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| `signatureValue` | A signature appropriate to the `signatureAlgorithm` field |
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### Cross-Certified Subordinate CA Certificate Profile
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| **Field** | **Description** |
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| ---- | ------ |
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| `tbsCertificate` | |
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|     `version` | See Section 7.1.1 |
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|     `serialNumber` | Approximately 128 bits, including at least 64 bits of output from a CSPRNG |
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|     `signature` | See Section 7.1.3.2 |
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|     `issuer` | Byte-for-byte identical to the `subject` field of the Issuing CA |
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|     `validity` | At most 8 years |
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|     `subject` | Byte-for-byte identical to the `subject` field of the existing CA Certificate |
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|     `subjectPublicKeyInfo` | See Sections 6.1.5, 6.1.6, and 7.1.3.1 |
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|     `issuerUniqueID` | Not present |
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|     `subjectUniqueID` | Not present |
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|     `extensions` | |
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|         `authorityInformationAccess` | Contains the HTTP URI of the Issuing CA's Certificate |
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|         `authorityKeyIdentifier` | Byte-for-byte identical to the `subjectKeyIdentifier` of the Issuing CA |
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|         `basicConstraints` | Critical, with `cA` set to true |
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|         `certificatePolicies` | Contains the Baseline Requirements Domain Validated Reserved Policy Identifier (OID 2.23.140.1.2.1) |
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|         `crlDistributionPoints` | Contains the HTTP URI of a CRL issued by the Issuing CA |
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|         `keyUsage` | Critical, with the `keyCertSign` (5) and `cRLSign` (6) bits set |
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|         `subjectKeyIdentifier` | Byte-for-byte identical to the `subjectKeyIdentifier` of the existing CA Certificate |
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|         Any other extension | Not present |
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| `signatureAlgorithm` | Byte-for-byte identical to the `tbsCertificate.signature` |
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| `signatureValue` | A signature appropriate to the `signatureAlgorithm` field |
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### TLS Subordinate CA Certificate Profile
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| **Field** | **Description** |
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| ---- | ------ |
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| `tbsCertificate` | |
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|     `version` | See Section 7.1.1 |
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|     `serialNumber` | Approximately 128 bits, including at least 64 bits of output from a CSPRNG |
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|     `signature` | See Section 7.1.3.2 |
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|     `issuer` | Byte-for-byte identical to the `subject` field of the Issuing CA |
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|     `validity` | At most 8 years |
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|     `subject` | C=US, O=Let's Encrypt, and a meaningful CN |
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|     `subjectPublicKeyInfo` | See Sections 6.1.5, 6.1.6, and 7.1.3.1 |
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|     `issuerUniqueID` | Not present |
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|     `subjectUniqueID` | Not present |
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|     `extensions` | |
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|         `authorityInformationAccess` | Contains the HTTP URI of the Issuing CA's Certificate |
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|         `authorityKeyIdentifier` | Byte-for-byte identical to the `subjectKeyIdentifier` of the Issuing CA |
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|         `basicConstraints` | Critical, with `cA` set to true and `pathLenConstraint` set to 0 |
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|         `certificatePolicies` | Contains the Baseline Requirements Domain Validated Reserved Policy Identifier (OID 2.23.140.1.2.1) |
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|         `crlDistributionPoints` | Contains the HTTP URI of a CRL issued by the Issuing CA |
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|         `extKeyUsage` | Contains `id-kp-serverAuth` (OID 1.3.6.1.5.5.7.3.1) |
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|         `keyUsage` | Critical, with the `digitalSignature` (0), `keyCertSign` (5), and `cRLSign` (6) bits set |
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|         `subjectKeyIdentifier` | Contains a truncated hash of the `subjectPublicKey`, per RFC 7093, Section 2(2) |
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|         Any other extension | Not present |
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| `signatureAlgorithm` | Byte-for-byte identical to the `tbsCertificate.signature` |
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| `signatureValue` | A signature appropriate to the `signatureAlgorithm` field |
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### Subscriber (Server) Certificate Profile
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| **Field** | **Description** |
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| ---- | ------ |
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| `tbsCertificate` | |
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|     `version` | See Section 7.1.1 |
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|     `serialNumber` | Approximately 144 bits, including at least 64 bits of output from a CSPRNG |
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|     `signature` | See Section 7.1.3.2 |
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|     `issuer` | Byte-for-byte identical to the `subject` field of the Issuing CA |
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|     `validity` | At most 100 days |
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|     `subject` | CN omitted, or optionally contains one of the values from the Subject Alternative Name extension |
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|     `subjectPublicKeyInfo` | See Sections 6.1.5, 6.1.6, and 7.1.3.1 |
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|     `issuerUniqueID` | Not present |
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|     `subjectUniqueID` | Not present |
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|     `extensions` | |
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|         `authorityInformationAccess` | Contains the HTTP URI of the Issuing CA's Certificate |
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|         `authorityKeyIdentifier` | Byte-for-byte identical to the `subjectKeyIdentifier` of the Issuing CA |
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|         `basicConstraints` | Critical, with `cA` set to false |
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|         `certificatePolicies` | Contains the Baseline Requirements Domain Validated Reserved Policy Identifier (OID 2.23.140.1.2.1) |
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|         `crlDistributionPoints` | Contains the HTTP URI of a CRL issued by the Issuing CA |
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|         `extKeyUsage` | Contains `id-kp-serverAuth` (OID 1.3.6.1.5.5.7.3.1), and optionally `id-kp-clientAuth` (OID 1.3.6.1.5.5.7.3.2) |
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|         `keyUsage` | Critical, with the `digitalSignature` (0) bit set, and optionally the `keyEnciperment` (2) bit set |
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|         `SignedCertificateTimestampList` | Contains at least two SCTs from logs run by different operators |
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|         `subjectAltName` | A sequence of 1 to 100 names of type `dNSName` or `ipAddress` (critical if CN omitted) |
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|         `subjectKeyIdentifier` | Optionally contains a truncated hash of the `subjectPublicKey`, per RFC 7093, Section 2(2) |
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|         Any other extension | Not present |
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| `signatureAlgorithm` | Byte-for-byte identical to the `tbsCertificate.signature` |
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| `signatureValue` | A signature appropriate to the `signatureAlgorithm` field |
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### Precertificate Profile
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Identical to the Subscriber (Server) Certificate Profile, except that the `SignedCertificateTimestampList` extension is omitted, and a critical "CT poison" extension (OID 1.3.6.1.4.1.11129.2.4.3) is included. ISRG Precertificates are issued directly by the Issuing CA, not by a delegated Precertificate Signing CA.
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### 7.1.1 Version number(s)
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