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package ca
import (
"context"
"crypto/rand"
"crypto/x509"
"encoding/hex"
"errors"
"fmt"
"math/big"
"strings"
"time"
"github.com/beeker1121/goque"
ct "github.com/google/certificate-transparency-go"
cttls "github.com/google/certificate-transparency-go/tls"
"github.com/jmhodges/clock"
"github.com/miekg/pkcs11"
"github.com/prometheus/client_golang/prometheus"
"golang.org/x/crypto/ocsp"
capb "github.com/letsencrypt/boulder/ca/proto"
"github.com/letsencrypt/boulder/core"
corepb "github.com/letsencrypt/boulder/core/proto"
csrlib "github.com/letsencrypt/boulder/csr"
berrors "github.com/letsencrypt/boulder/errors"
"github.com/letsencrypt/boulder/features"
"github.com/letsencrypt/boulder/goodkey"
"github.com/letsencrypt/boulder/issuance"
blog "github.com/letsencrypt/boulder/log"
sapb "github.com/letsencrypt/boulder/sa/proto"
)
// Metrics for CA statistics
const (
csrExtensionCategory = "category"
csrExtensionBasic = "basic"
csrExtensionTLSFeature = "tls-feature"
csrExtensionTLSFeatureInvalid = "tls-feature-invalid"
csrExtensionOther = "other"
)
type certificateType string
const (
precertType = certificateType("precertificate")
certType = certificateType("certificate")
)
// Two maps of keys to Issuers. Lookup by PublicKeyAlgorithm is useful for
// determining which issuer to use to sign a given (pre)cert, based on its
// PublicKeyAlgorithm. Lookup by NameID is useful for looking up the appropriate
// issuer based on the issuer of a given (pre)certificate.
type issuerMaps struct {
byAlg map[x509.PublicKeyAlgorithm]*issuance.Issuer
byNameID map[issuance.IssuerNameID]*issuance.Issuer
}
// certificateAuthorityImpl represents a CA that signs certificates.
// It can sign OCSP responses as well, but only via delegation to an ocspImpl.
type certificateAuthorityImpl struct {
capb.UnimplementedCertificateAuthorityServer
capb.UnimplementedOCSPGeneratorServer
sa sapb.StorageAuthorityCertificateClient
pa core.PolicyAuthority
ocsp *ocspImpl
issuers issuerMaps
// This is temporary, and will be used for testing and slow roll-out
// of ECDSA issuance, but will then be removed.
ecdsaAllowList *ECDSAAllowList
prefix int // Prepended to the serial number
validityPeriod time.Duration
backdate time.Duration
maxNames int
keyPolicy goodkey.KeyPolicy
orphanQueue *goque.Queue
clk clock.Clock
log blog.Logger
signatureCount *prometheus.CounterVec
csrExtensionCount *prometheus.CounterVec
orphanCount *prometheus.CounterVec
adoptedOrphanCount *prometheus.CounterVec
signErrorCount *prometheus.CounterVec
}
// makeIssuerMaps processes a list of issuers into a set of maps, mapping
// nearly-unique identifiers of those issuers to the issuers themselves. Note
// that, if two issuers have the same nearly-unique ID, the *latter* one in
// the input list "wins".
func makeIssuerMaps(issuers []*issuance.Issuer) (issuerMaps, error) {
issuersByAlg := make(map[x509.PublicKeyAlgorithm]*issuance.Issuer, 2)
issuersByNameID := make(map[issuance.IssuerNameID]*issuance.Issuer, len(issuers))
for _, issuer := range issuers {
for _, alg := range issuer.Algs() {
// TODO(#5259): Enforce that there is only one issuer for each algorithm,
// instead of taking the first issuer for each algorithm type.
if issuersByAlg[alg] == nil {
issuersByAlg[alg] = issuer
}
}
issuersByNameID[issuer.Cert.NameID()] = issuer
}
return issuerMaps{issuersByAlg, issuersByNameID}, nil
}
// NewCertificateAuthorityImpl creates a CA instance that can sign certificates
// from any number of issuance.Issuers according to their profiles, and can sign
// OCSP (via delegation to an ocspImpl and its issuers).
func NewCertificateAuthorityImpl(
sa sapb.StorageAuthorityCertificateClient,
pa core.PolicyAuthority,
ocsp *ocspImpl,
boulderIssuers []*issuance.Issuer,
ecdsaAllowList *ECDSAAllowList,
certExpiry time.Duration,
certBackdate time.Duration,
serialPrefix int,
maxNames int,
keyPolicy goodkey.KeyPolicy,
orphanQueue *goque.Queue,
logger blog.Logger,
stats prometheus.Registerer,
signatureCount *prometheus.CounterVec,
signErrorCount *prometheus.CounterVec,
clk clock.Clock,
) (*certificateAuthorityImpl, error) {
var ca *certificateAuthorityImpl
var err error
// TODO(briansmith): Make the backdate setting mandatory after the
// production ca.json has been updated to include it. Until then, manually
// default to 1h, which is the backdating duration we currently use.
if certBackdate == 0 {
certBackdate = time.Hour
}
if serialPrefix <= 0 || serialPrefix >= 256 {
err = errors.New("Must have a positive non-zero serial prefix less than 256 for CA.")
return nil, err
}
issuers, err := makeIssuerMaps(boulderIssuers)
if err != nil {
return nil, err
}
csrExtensionCount := prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: "csr_extensions",
Help: "Number of CSRs with extensions of the given category",
},
[]string{csrExtensionCategory})
stats.MustRegister(csrExtensionCount)
orphanCount := prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: "orphans",
Help: "Number of orphaned certificates labelled by type (precert, cert)",
},
[]string{"type"})
stats.MustRegister(orphanCount)
adoptedOrphanCount := prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: "adopted_orphans",
Help: "Number of orphaned certificates adopted from the orphan queue by type (precert, cert)",
},
[]string{"type"})
stats.MustRegister(adoptedOrphanCount)
ca = &certificateAuthorityImpl{
sa: sa,
pa: pa,
ocsp: ocsp,
issuers: issuers,
validityPeriod: certExpiry,
backdate: certBackdate,
prefix: serialPrefix,
maxNames: maxNames,
keyPolicy: keyPolicy,
orphanQueue: orphanQueue,
log: logger,
signatureCount: signatureCount,
csrExtensionCount: csrExtensionCount,
orphanCount: orphanCount,
adoptedOrphanCount: adoptedOrphanCount,
signErrorCount: signErrorCount,
clk: clk,
ecdsaAllowList: ecdsaAllowList,
}
return ca, nil
}
// noteSignError is called after operations that may cause a PKCS11 signing error.
func (ca *certificateAuthorityImpl) noteSignError(err error) {
var pkcs11Error *pkcs11.Error
if errors.As(err, &pkcs11Error) {
ca.signErrorCount.WithLabelValues("HSM").Inc()
}
}
var ocspStatusToCode = map[string]int{
"good": ocsp.Good,
"revoked": ocsp.Revoked,
"unknown": ocsp.Unknown,
}
func (ca *certificateAuthorityImpl) IssuePrecertificate(ctx context.Context, issueReq *capb.IssueCertificateRequest) (*capb.IssuePrecertificateResponse, error) {
// issueReq.orderID may be zero, for ACMEv1 requests.
if core.IsAnyNilOrZero(issueReq, issueReq.Csr, issueReq.RegistrationID) {
return nil, berrors.InternalServerError("Incomplete issue certificate request")
}
serialBigInt, validity, err := ca.generateSerialNumberAndValidity()
if err != nil {
return nil, err
}
serialHex := core.SerialToString(serialBigInt)
regID := issueReq.RegistrationID
nowNanos := ca.clk.Now().UnixNano()
expiresNanos := validity.NotAfter.UnixNano()
_, err = ca.sa.AddSerial(ctx, &sapb.AddSerialRequest{
Serial: serialHex,
RegID: regID,
Created: nowNanos,
Expires: expiresNanos,
})
if err != nil {
return nil, err
}
precertDER, ocspResp, issuer, err := ca.issuePrecertificateInner(ctx, issueReq, serialBigInt, validity)
if err != nil {
return nil, err
}
issuerID := issuer.Cert.NameID()
req := &sapb.AddCertificateRequest{
Der: precertDER,
RegID: regID,
Ocsp: ocspResp.Response,
Issued: nowNanos,
IssuerID: int64(issuerID),
}
_, err = ca.sa.AddPrecertificate(ctx, req)
if err != nil {
ca.orphanCount.With(prometheus.Labels{"type": "precert"}).Inc()
err = berrors.InternalServerError(err.Error())
// Note: This log line is parsed by cmd/orphan-finder. If you make any
// changes here, you should make sure they are reflected in orphan-finder.
ca.log.AuditErrf("Failed RPC to store at SA, orphaning precertificate: serial=[%s], cert=[%s], issuerID=[%d], regID=[%d], orderID=[%d], err=[%v]",
serialHex, hex.EncodeToString(precertDER), issuerID, issueReq.RegistrationID, issueReq.OrderID, err)
if ca.orphanQueue != nil {
ca.queueOrphan(&orphanedCert{
DER: precertDER,
RegID: regID,
OCSPResp: ocspResp.Response,
Precert: true,
IssuerID: int64(issuerID),
})
}
return nil, err
}
return &capb.IssuePrecertificateResponse{
DER: precertDER,
}, nil
}
// IssueCertificateForPrecertificate takes a precertificate and a set
// of SCTs for that precertificate and uses the signer to create and
// sign a certificate from them. The poison extension is removed and a
// SCT list extension is inserted in its place. Except for this and the
// signature the certificate exactly matches the precertificate. After
// the certificate is signed a OCSP response is generated and the
// response and certificate are stored in the database.
//
// It's critical not to sign two different final certificates for the same
// precertificate. This can happen, for instance, if the caller provides a
// different set of SCTs on subsequent calls to IssueCertificateForPrecertificate.
// We rely on the RA not to call IssueCertificateForPrecertificate twice for the
// same serial. This is accomplished by the fact that
// IssueCertificateForPrecertificate is only ever called in a straight-through
// RPC path without retries. If there is any error, including a networking
// error, the whole certificate issuance attempt fails and any subsequent
// issuance will use a different serial number.
//
// We also check that the provided serial number does not already exist as a
// final certificate, but this is just a belt-and-suspenders measure, since
// there could be race conditions where two goroutines are issuing for the same
// serial number at the same time.
func (ca *certificateAuthorityImpl) IssueCertificateForPrecertificate(ctx context.Context, req *capb.IssueCertificateForPrecertificateRequest) (*corepb.Certificate, error) {
// issueReq.orderID may be zero, for ACMEv1 requests.
if core.IsAnyNilOrZero(req, req.DER, req.SCTs, req.RegistrationID) {
return nil, berrors.InternalServerError("Incomplete cert for precertificate request")
}
precert, err := x509.ParseCertificate(req.DER)
if err != nil {
return nil, err
}
serialHex := core.SerialToString(precert.SerialNumber)
if _, err = ca.sa.GetCertificate(ctx, &sapb.Serial{Serial: serialHex}); err == nil {
err = berrors.InternalServerError("issuance of duplicate final certificate requested: %s", serialHex)
ca.log.AuditErr(err.Error())
return nil, err
} else if !errors.Is(err, berrors.NotFound) {
return nil, fmt.Errorf("error checking for duplicate issuance of %s: %s", serialHex, err)
}
var scts []ct.SignedCertificateTimestamp
for _, sctBytes := range req.SCTs {
var sct ct.SignedCertificateTimestamp
_, err = cttls.Unmarshal(sctBytes, &sct)
if err != nil {
return nil, err
}
scts = append(scts, sct)
}
issuer, ok := ca.issuers.byNameID[issuance.GetIssuerNameID(precert)]
if !ok {
return nil, berrors.InternalServerError("no issuer found for Issuer Name %s", precert.Issuer)
}
issuanceReq, err := issuance.RequestFromPrecert(precert, scts)
if err != nil {
return nil, err
}
certDER, err := issuer.Issue(issuanceReq)
if err != nil {
return nil, err
}
ca.signatureCount.With(prometheus.Labels{"purpose": string(certType), "issuer": issuer.Name()}).Inc()
ca.log.AuditInfof("Signing success: serial=[%s] regID=[%d] names=[%s] csr=[%s] certificate=[%s]",
serialHex, req.RegistrationID, strings.Join(precert.DNSNames, ", "), hex.EncodeToString(req.DER),
hex.EncodeToString(certDER))
err = ca.storeCertificate(ctx, req.RegistrationID, req.OrderID, precert.SerialNumber, certDER, int64(issuer.Cert.NameID()))
if err != nil {
return nil, err
}
return &corepb.Certificate{
RegistrationID: req.RegistrationID,
Serial: core.SerialToString(precert.SerialNumber),
Der: certDER,
Digest: core.Fingerprint256(certDER),
Issued: precert.NotBefore.UnixNano(),
Expires: precert.NotAfter.UnixNano(),
}, nil
}
type validity struct {
NotBefore time.Time
NotAfter time.Time
}
func (ca *certificateAuthorityImpl) generateSerialNumberAndValidity() (*big.Int, validity, error) {
// We want 136 bits of random number, plus an 8-bit instance id prefix.
const randBits = 136
serialBytes := make([]byte, randBits/8+1)
serialBytes[0] = byte(ca.prefix)
_, err := rand.Read(serialBytes[1:])
if err != nil {
err = berrors.InternalServerError("failed to generate serial: %s", err)
ca.log.AuditErrf("Serial randomness failed, err=[%v]", err)
return nil, validity{}, err
}
serialBigInt := big.NewInt(0)
serialBigInt = serialBigInt.SetBytes(serialBytes)
notBefore := ca.clk.Now().Add(-ca.backdate)
validity := validity{
NotBefore: notBefore,
NotAfter: notBefore.Add(ca.validityPeriod - time.Second),
}
return serialBigInt, validity, nil
}
func (ca *certificateAuthorityImpl) issuePrecertificateInner(ctx context.Context, issueReq *capb.IssueCertificateRequest, serialBigInt *big.Int, validity validity) ([]byte, *capb.OCSPResponse, *issuance.Issuer, error) {
csr, err := x509.ParseCertificateRequest(issueReq.Csr)
if err != nil {
return nil, nil, nil, err
}
err = csrlib.VerifyCSR(ctx, csr, ca.maxNames, &ca.keyPolicy, ca.pa)
if err != nil {
ca.log.AuditErr(err.Error())
// VerifyCSR returns berror instances that can be passed through as-is
// without wrapping.
return nil, nil, nil, err
}
var issuer *issuance.Issuer
var ok bool
if issueReq.IssuerNameID == 0 {
// Use the issuer which corresponds to the algorithm of the public key
// contained in the CSR, unless we have an allowlist of registration IDs
// for ECDSA, in which case switch all not-allowed accounts to RSA issuance.
alg := csr.PublicKeyAlgorithm
if alg == x509.ECDSA && !features.Enabled(features.ECDSAForAll) && ca.ecdsaAllowList != nil && !ca.ecdsaAllowList.permitted(issueReq.RegistrationID) {
alg = x509.RSA
}
issuer, ok = ca.issuers.byAlg[alg]
if !ok {
return nil, nil, nil, berrors.InternalServerError("no issuer found for public key algorithm %s", csr.PublicKeyAlgorithm)
}
} else {
issuer, ok = ca.issuers.byNameID[issuance.IssuerNameID(issueReq.IssuerNameID)]
if !ok {
return nil, nil, nil, berrors.InternalServerError("no issuer found for IssuerNameID %d", issueReq.IssuerNameID)
}
}
if issuer.Cert.NotAfter.Before(validity.NotAfter) {
err = berrors.InternalServerError("cannot issue a certificate that expires after the issuer certificate")
ca.log.AuditErr(err.Error())
return nil, nil, nil, err
}
serialHex := core.SerialToString(serialBigInt)
// Generate ocsp response before issuing precertificate
ocspResp, err := ca.ocsp.GenerateOCSP(ctx, &capb.GenerateOCSPRequest{
Serial: serialHex,
IssuerID: int64(issuer.Cert.NameID()),
Status: string(core.OCSPStatusGood),
})
if err != nil {
err = berrors.InternalServerError(err.Error())
ca.log.AuditInfof("OCSP Signing for precertificate failure: serial=[%s] err=[%s]", serialHex, err)
return nil, nil, nil, err
}
ca.log.AuditInfof("Signing: serial=[%s] regID=[%d] names=[%s] csr=[%s]",
serialHex, issueReq.RegistrationID, strings.Join(csr.DNSNames, ", "), hex.EncodeToString(csr.Raw))
certDER, err := issuer.Issue(&issuance.IssuanceRequest{
PublicKey: csr.PublicKey,
Serial: serialBigInt.Bytes(),
CommonName: csr.Subject.CommonName,
DNSNames: csr.DNSNames,
IncludeCTPoison: true,
IncludeMustStaple: issuance.ContainsMustStaple(csr.Extensions),
NotBefore: validity.NotBefore,
NotAfter: validity.NotAfter,
})
ca.noteSignError(err)
if err != nil {
err = berrors.InternalServerError("failed to sign certificate: %s", err)
ca.log.AuditErrf("Signing failed: serial=[%s] err=[%v]", serialHex, err)
return nil, nil, nil, err
}
ca.signatureCount.With(prometheus.Labels{"purpose": string(precertType), "issuer": issuer.Name()}).Inc()
ca.log.AuditInfof("Signing success: serial=[%s] regID=[%d] names=[%s] csr=[%s] precertificate=[%s]",
serialHex, issueReq.RegistrationID, strings.Join(csr.DNSNames, ", "), hex.EncodeToString(csr.Raw),
hex.EncodeToString(certDER))
return certDER, ocspResp, issuer, nil
}
func (ca *certificateAuthorityImpl) storeCertificate(
ctx context.Context,
regID int64,
orderID int64,
serialBigInt *big.Int,
certDER []byte,
issuerID int64) error {
var err error
_, err = ca.sa.AddCertificate(ctx, &sapb.AddCertificateRequest{
Der: certDER,
RegID: regID,
Issued: ca.clk.Now().UnixNano(),
})
if err != nil {
ca.orphanCount.With(prometheus.Labels{"type": "cert"}).Inc()
err = berrors.InternalServerError(err.Error())
// Note: This log line is parsed by cmd/orphan-finder. If you make any
// changes here, you should make sure they are reflected in orphan-finder.
ca.log.AuditErrf("Failed RPC to store at SA, orphaning certificate: serial=[%s] cert=[%s] err=[%v], regID=[%d], orderID=[%d]",
core.SerialToString(serialBigInt), hex.EncodeToString(certDER), err, regID, orderID)
if ca.orphanQueue != nil {
ca.queueOrphan(&orphanedCert{
DER: certDER,
RegID: regID,
IssuerID: issuerID,
})
}
return err
}
return nil
}
type orphanedCert struct {
DER []byte
OCSPResp []byte
RegID int64
Precert bool
IssuerID int64
}
func (ca *certificateAuthorityImpl) queueOrphan(o *orphanedCert) {
if _, err := ca.orphanQueue.EnqueueObject(o); err != nil {
ca.log.AuditErrf("failed to queue orphan for integration: %s", err)
}
}
// OrphanIntegrationLoop runs a loop executing integrateOrphans and then waiting a minute.
// It is split out into a separate function called directly by boulder-ca in order to make
// testing the orphan queue functionality somewhat more simple.
func (ca *certificateAuthorityImpl) OrphanIntegrationLoop() {
for {
err := ca.integrateOrphan()
if err != nil {
if err == goque.ErrEmpty {
time.Sleep(time.Minute)
continue
}
ca.log.AuditErrf("failed to integrate orphaned certs: %s", err)
time.Sleep(time.Second)
}
}
}
// integrateOrpan removes an orphan from the queue and adds it to the database. The
// item isn't dequeued until it is actually added to the database to prevent items from
// being lost if the CA is restarted between the item being dequeued and being added to
// the database. It calculates the issuance time by subtracting the backdate period from
// the notBefore time.
func (ca *certificateAuthorityImpl) integrateOrphan() error {
item, err := ca.orphanQueue.Peek()
if err != nil {
if err == goque.ErrEmpty {
return goque.ErrEmpty
}
return fmt.Errorf("failed to peek into orphan queue: %s", err)
}
var orphan orphanedCert
if err = item.ToObject(&orphan); err != nil {
return fmt.Errorf("failed to marshal orphan: %s", err)
}
cert, err := x509.ParseCertificate(orphan.DER)
if err != nil {
return fmt.Errorf("failed to parse orphan: %s", err)
}
// When calculating the `NotBefore` at issuance time, we subtracted
// ca.backdate. Now, to calculate the actual issuance time from the NotBefore,
// we reverse the process and add ca.backdate.
issued := cert.NotBefore.Add(ca.backdate)
if orphan.Precert {
_, err = ca.sa.AddPrecertificate(context.Background(), &sapb.AddCertificateRequest{
Der: orphan.DER,
RegID: orphan.RegID,
Ocsp: orphan.OCSPResp,
Issued: issued.UnixNano(),
IssuerID: orphan.IssuerID,
})
if err != nil && !errors.Is(err, berrors.Duplicate) {
return fmt.Errorf("failed to store orphaned precertificate: %s", err)
}
} else {
_, err = ca.sa.AddCertificate(context.Background(), &sapb.AddCertificateRequest{
Der: orphan.DER,
RegID: orphan.RegID,
Issued: issued.UnixNano(),
})
if err != nil && !errors.Is(err, berrors.Duplicate) {
return fmt.Errorf("failed to store orphaned certificate: %s", err)
}
}
if _, err = ca.orphanQueue.Dequeue(); err != nil {
return fmt.Errorf("failed to dequeue integrated orphaned certificate: %s", err)
}
ca.log.AuditInfof("Incorporated orphaned certificate: serial=[%s] cert=[%s] regID=[%d]",
core.SerialToString(cert.SerialNumber), hex.EncodeToString(orphan.DER), orphan.RegID)
typ := "cert"
if orphan.Precert {
typ = "precert"
}
ca.adoptedOrphanCount.With(prometheus.Labels{"type": typ}).Inc()
return nil
}
// GenerateOCSP is simply a passthrough to ocspImpl.GenerateOCSP so that other
// services which need to talk to the CA anyway can do so without configuring
// two separate gRPC service backends.
func (ca *certificateAuthorityImpl) GenerateOCSP(ctx context.Context, req *capb.GenerateOCSPRequest) (*capb.OCSPResponse, error) {
return ca.ocsp.GenerateOCSP(ctx, req)
}