func (ca *CA) signCertificate(template *x509.Certificate, requestKey crypto.PublicKey) (*x509.Certificate, error) {
// Increment and persist serial
serial, err := ca.nextSerial()
if err != nil {
return nil, err
}
template.SerialNumber = big.NewInt(serial)
return signCertificate(template, requestKey, ca.Config.Certs[0], ca.Config.Key)
}
func makeCert(template, issuer *x509.Certificate, pub interface{}, priv crypto.Signer) *x509.Certificate {
// Set a random serial number
serialNumber, err := rand.Int(rand.Reader, big.NewInt(1000))
panicOnError(err)
template.SerialNumber = serialNumber
certDER, err := x509.CreateCertificate(rand.Reader, template, issuer, pub, priv)
panicOnError(err)
cert, err := x509.ParseCertificate(certDER)
panicOnError(err)
return cert
}
// When comparing certificates created at different times for equality, we do
// not want to worry about fields which are dependent on the time of creation.
// Thus we nullify these fields before comparing the certificates.
func nullifyTimeDependency(cert *x509.Certificate) *x509.Certificate {
cert.Raw = nil
cert.RawTBSCertificate = nil
cert.RawSubjectPublicKeyInfo = nil
cert.Signature = nil
cert.PublicKey = nil
cert.SerialNumber = nil
cert.NotBefore = time.Time{}
cert.NotAfter = time.Time{}
cert.Extensions = nil
cert.SubjectKeyId = nil
cert.AuthorityKeyId = nil
return cert
}
func TestGetAndProcessCerts(t *testing.T) {
saDbMap, err := sa.NewDbMap(saDbConnStr)
test.AssertNotError(t, err, "Couldn't connect to database")
paDbMap, err := sa.NewDbMap(paDbConnStr)
test.AssertNotError(t, err, "Couldn't connect to policy database")
fc := clock.NewFake()
checker := newChecker(saDbMap, paDbMap, fc, false)
sa, err := sa.NewSQLStorageAuthority(saDbMap, fc)
test.AssertNotError(t, err, "Couldn't create SA to insert certificates")
saCleanUp := test.ResetTestDatabase(t, saDbMap.Db)
paCleanUp := test.ResetTestDatabase(t, paDbMap.Db)
defer func() {
saCleanUp()
paCleanUp()
}()
testKey, _ := rsa.GenerateKey(rand.Reader, 1024)
// Problems
// Expiry period is too long
rawCert := x509.Certificate{
Subject: pkix.Name{
CommonName: "not-blacklisted.com",
},
BasicConstraintsValid: true,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth},
}
reg, err := sa.NewRegistration(core.Registration{
Key: satest.GoodJWK(),
})
test.AssertNotError(t, err, "Couldn't create registration")
for i := int64(0); i < 5; i++ {
rawCert.SerialNumber = big.NewInt(i)
certDER, err := x509.CreateCertificate(rand.Reader, &rawCert, &rawCert, &testKey.PublicKey, testKey)
test.AssertNotError(t, err, "Couldn't create certificate")
_, err = sa.AddCertificate(certDER, reg.ID)
test.AssertNotError(t, err, "Couldn't add certificate")
}
err = checker.getCerts()
test.AssertNotError(t, err, "Failed to retrieve certificates")
test.AssertEquals(t, len(checker.certs), 5)
wg := new(sync.WaitGroup)
wg.Add(1)
checker.processCerts(wg)
test.AssertEquals(t, checker.issuedReport.BadCerts, int64(5))
test.AssertEquals(t, len(checker.issuedReport.Entries), 5)
}
func TestGetAndProcessCerts(t *testing.T) {
saDbMap, err := sa.NewDbMap(vars.DBConnSA, 0)
test.AssertNotError(t, err, "Couldn't connect to database")
fc := clock.NewFake()
checker := newChecker(saDbMap, fc, pa, expectedValidityPeriod)
sa, err := sa.NewSQLStorageAuthority(saDbMap, fc, blog.NewMock())
test.AssertNotError(t, err, "Couldn't create SA to insert certificates")
saCleanUp := test.ResetSATestDatabase(t)
defer func() {
saCleanUp()
}()
testKey, _ := rsa.GenerateKey(rand.Reader, 1024)
// Problems
// Expiry period is too long
rawCert := x509.Certificate{
Subject: pkix.Name{
CommonName: "not-blacklisted.com",
},
BasicConstraintsValid: true,
DNSNames: []string{"not-blacklisted.com"},
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth},
}
reg := satest.CreateWorkingRegistration(t, sa)
test.AssertNotError(t, err, "Couldn't create registration")
for i := int64(0); i < 5; i++ {
rawCert.SerialNumber = big.NewInt(mrand.Int63())
certDER, err := x509.CreateCertificate(rand.Reader, &rawCert, &rawCert, &testKey.PublicKey, testKey)
test.AssertNotError(t, err, "Couldn't create certificate")
_, err = sa.AddCertificate(context.Background(), certDER, reg.ID)
test.AssertNotError(t, err, "Couldn't add certificate")
}
batchSize = 2
err = checker.getCerts(false)
test.AssertNotError(t, err, "Failed to retrieve certificates")
test.AssertEquals(t, len(checker.certs), 5)
wg := new(sync.WaitGroup)
wg.Add(1)
checker.processCerts(wg, false)
test.AssertEquals(t, checker.issuedReport.BadCerts, int64(5))
test.AssertEquals(t, len(checker.issuedReport.Entries), 5)
}
func (c *VFSCAStore) IssueCert(id string, serial *big.Int, privateKey *PrivateKey, template *x509.Certificate) (*Certificate, error) {
glog.Infof("Issuing new certificate: %q", id)
template.SerialNumber = serial
p := c.buildCertificatePath(id, serial)
if c.caPrivateKeys == nil || c.caPrivateKeys.Primary() == nil {
return nil, fmt.Errorf("ca.key was not found; cannot issue certificates")
}
cert, err := SignNewCertificate(privateKey, template, c.caCertificates.Primary().Certificate, c.caPrivateKeys.Primary())
if err != nil {
return nil, err
}
err = c.storeCertificate(cert, p)
if err != nil {
return nil, err
}
// Make double-sure it round-trips
return c.loadOneCertificate(p)
}
// Sign signs a new certificate based on the PEM-encoded client
// certificate or certificate request with the signing profile,
// specified by profileName.
func (s *Signer) Sign(req signer.SignRequest) (cert []byte, err error) {
profile, err := signer.Profile(s, req.Profile)
if err != nil {
return
}
block, _ := pem.Decode([]byte(req.Request))
if block == nil {
return nil, cferr.New(cferr.CSRError, cferr.DecodeFailed)
}
if block.Type != "CERTIFICATE REQUEST" {
return nil, cferr.Wrap(cferr.CSRError,
cferr.BadRequest, errors.New("not a certificate or csr"))
}
csrTemplate, err := signer.ParseCertificateRequest(s, block.Bytes)
if err != nil {
return nil, err
}
// Copy out only the fields from the CSR authorized by policy.
safeTemplate := x509.Certificate{}
// If the profile contains no explicit whitelist, assume that all fields
// should be copied from the CSR.
if profile.CSRWhitelist == nil {
safeTemplate = *csrTemplate
} else {
if profile.CSRWhitelist.Subject {
safeTemplate.Subject = csrTemplate.Subject
}
if profile.CSRWhitelist.PublicKeyAlgorithm {
safeTemplate.PublicKeyAlgorithm = csrTemplate.PublicKeyAlgorithm
}
if profile.CSRWhitelist.PublicKey {
safeTemplate.PublicKey = csrTemplate.PublicKey
}
if profile.CSRWhitelist.SignatureAlgorithm {
safeTemplate.SignatureAlgorithm = csrTemplate.SignatureAlgorithm
}
if profile.CSRWhitelist.DNSNames {
safeTemplate.DNSNames = csrTemplate.DNSNames
}
if profile.CSRWhitelist.IPAddresses {
safeTemplate.IPAddresses = csrTemplate.IPAddresses
}
}
OverrideHosts(&safeTemplate, req.Hosts)
safeTemplate.Subject = PopulateSubjectFromCSR(req.Subject, safeTemplate.Subject)
// If there is a whitelist, ensure that both the Common Name and SAN DNSNames match
if profile.NameWhitelist != nil {
if safeTemplate.Subject.CommonName != "" {
if profile.NameWhitelist.Find([]byte(safeTemplate.Subject.CommonName)) == nil {
return nil, cferr.New(cferr.PolicyError, cferr.InvalidPolicy)
}
}
for _, name := range safeTemplate.DNSNames {
if profile.NameWhitelist.Find([]byte(name)) == nil {
return nil, cferr.New(cferr.PolicyError, cferr.InvalidPolicy)
}
}
}
if profile.ClientProvidesSerialNumbers {
if req.Serial == nil {
fmt.Printf("xx %#v\n", profile)
return nil, cferr.New(cferr.CertificateError, cferr.MissingSerial)
}
safeTemplate.SerialNumber = req.Serial
} else {
serialNumber, err := rand.Int(rand.Reader, new(big.Int).SetInt64(math.MaxInt64))
if err != nil {
return nil, cferr.Wrap(cferr.CertificateError, cferr.Unknown, err)
}
safeTemplate.SerialNumber = serialNumber
}
if len(req.Extensions) > 0 {
for _, ext := range req.Extensions {
oid := asn1.ObjectIdentifier(ext.ID)
if !profile.ExtensionWhitelist[oid.String()] {
return nil, cferr.New(cferr.CertificateError, cferr.InvalidRequest)
}
rawValue, err := hex.DecodeString(ext.Value)
if err != nil {
return nil, cferr.Wrap(cferr.CertificateError, cferr.InvalidRequest, err)
}
safeTemplate.ExtraExtensions = append(safeTemplate.ExtraExtensions, pkix.Extension{
Id: oid,
Critical: ext.Critical,
Value: rawValue,
})
}
}
var certTBS = safeTemplate
if len(profile.CTLogServers) > 0 {
// Add a poison extension which prevents validation
var poisonExtension = pkix.Extension{Id: signer.CTPoisonOID, Critical: true, Value: []byte{0x05, 0x00}}
var poisonedPreCert = certTBS
poisonedPreCert.ExtraExtensions = append(safeTemplate.ExtraExtensions, poisonExtension)
cert, err = s.sign(&poisonedPreCert, profile)
if err != nil {
return
}
derCert, _ := pem.Decode(cert)
prechain := []ct.ASN1Cert{derCert.Bytes, s.ca.Raw}
var sctList []ct.SignedCertificateTimestamp
for _, server := range profile.CTLogServers {
log.Infof("submitting poisoned precertificate to %s", server)
var ctclient = client.New(server)
var resp *ct.SignedCertificateTimestamp
resp, err = ctclient.AddPreChain(prechain)
if err != nil {
return nil, cferr.Wrap(cferr.CTError, cferr.PrecertSubmissionFailed, err)
}
sctList = append(sctList, *resp)
}
var serializedSCTList []byte
serializedSCTList, err = serializeSCTList(sctList)
if err != nil {
return nil, cferr.Wrap(cferr.CTError, cferr.Unknown, err)
}
// Serialize again as an octet string before embedding
serializedSCTList, err = asn1.Marshal(serializedSCTList)
if err != nil {
return nil, cferr.Wrap(cferr.CTError, cferr.Unknown, err)
}
var SCTListExtension = pkix.Extension{Id: signer.SCTListOID, Critical: false, Value: serializedSCTList}
certTBS.ExtraExtensions = append(certTBS.ExtraExtensions, SCTListExtension)
}
return s.sign(&certTBS, profile)
}
// Sign signs a new certificate based on the PEM-encoded client
// certificate or certificate request with the signing profile,
// specified by profileName.
func (s *Signer) Sign(req signer.SignRequest) (cert []byte, err error) {
profile, err := signer.Profile(s, req.Profile)
if err != nil {
return
}
block, _ := pem.Decode([]byte(req.Request))
if block == nil {
return nil, cferr.New(cferr.CSRError, cferr.DecodeFailed)
}
if block.Type != "CERTIFICATE REQUEST" {
return nil, cferr.Wrap(cferr.CSRError,
cferr.BadRequest, errors.New("not a certificate or csr"))
}
csrTemplate, err := signer.ParseCertificateRequest(s, block.Bytes)
if err != nil {
return nil, err
}
// Copy out only the fields from the CSR authorized by policy.
safeTemplate := x509.Certificate{}
// If the profile contains no explicit whitelist, assume that all fields
// should be copied from the CSR.
if profile.CSRWhitelist == nil {
safeTemplate = *csrTemplate
} else {
if profile.CSRWhitelist.Subject {
safeTemplate.Subject = csrTemplate.Subject
}
if profile.CSRWhitelist.PublicKeyAlgorithm {
safeTemplate.PublicKeyAlgorithm = csrTemplate.PublicKeyAlgorithm
}
if profile.CSRWhitelist.PublicKey {
safeTemplate.PublicKey = csrTemplate.PublicKey
}
if profile.CSRWhitelist.SignatureAlgorithm {
safeTemplate.SignatureAlgorithm = csrTemplate.SignatureAlgorithm
}
if profile.CSRWhitelist.DNSNames {
safeTemplate.DNSNames = csrTemplate.DNSNames
}
if profile.CSRWhitelist.IPAddresses {
safeTemplate.IPAddresses = csrTemplate.IPAddresses
}
}
OverrideHosts(&safeTemplate, req.Hosts)
safeTemplate.Subject = PopulateSubjectFromCSR(req.Subject, safeTemplate.Subject)
// If there is a whitelist, ensure that both the Common Name and SAN DNSNames match
if profile.NameWhitelist != nil {
if safeTemplate.Subject.CommonName != "" {
if profile.NameWhitelist.Find([]byte(safeTemplate.Subject.CommonName)) == nil {
return nil, cferr.New(cferr.PolicyError, cferr.InvalidPolicy)
}
}
for _, name := range safeTemplate.DNSNames {
if profile.NameWhitelist.Find([]byte(name)) == nil {
return nil, cferr.New(cferr.PolicyError, cferr.InvalidPolicy)
}
}
}
if profile.ClientProvidesSerialNumbers {
if req.Serial == nil {
fmt.Printf("xx %#v\n", profile)
return nil, cferr.New(cferr.CertificateError, cferr.MissingSerial)
}
safeTemplate.SerialNumber = req.Serial
} else {
// RFC 5280 4.1.2.2:
// Certificate users MUST be able to handle serialNumber
// values up to 20 octets. Conforming CAs MUST NOT use
// serialNumber values longer than 20 octets.
//
// If CFSSL is providing the serial numbers, it makes
// sense to use the max supported size.
serialNumber := make([]byte, 20)
_, err = io.ReadFull(rand.Reader, serialNumber)
if err != nil {
return nil, cferr.Wrap(cferr.CertificateError, cferr.Unknown, err)
}
// SetBytes interprets buf as the bytes of a big-endian
// unsigned integer. The leading byte should be masked
// off to ensure it isn't negative.
serialNumber[0] &= 0x7F
safeTemplate.SerialNumber = new(big.Int).SetBytes(serialNumber)
}
if len(req.Extensions) > 0 {
for _, ext := range req.Extensions {
oid := asn1.ObjectIdentifier(ext.ID)
if !profile.ExtensionWhitelist[oid.String()] {
return nil, cferr.New(cferr.CertificateError, cferr.InvalidRequest)
}
rawValue, err := hex.DecodeString(ext.Value)
if err != nil {
return nil, cferr.Wrap(cferr.CertificateError, cferr.InvalidRequest, err)
}
safeTemplate.ExtraExtensions = append(safeTemplate.ExtraExtensions, pkix.Extension{
Id: oid,
Critical: ext.Critical,
Value: rawValue,
})
}
}
var certTBS = safeTemplate
if len(profile.CTLogServers) > 0 {
// Add a poison extension which prevents validation
var poisonExtension = pkix.Extension{Id: signer.CTPoisonOID, Critical: true, Value: []byte{0x05, 0x00}}
var poisonedPreCert = certTBS
poisonedPreCert.ExtraExtensions = append(safeTemplate.ExtraExtensions, poisonExtension)
cert, err = s.sign(&poisonedPreCert, profile)
if err != nil {
return
}
derCert, _ := pem.Decode(cert)
prechain := []ct.ASN1Cert{derCert.Bytes, s.ca.Raw}
var sctList []ct.SignedCertificateTimestamp
for _, server := range profile.CTLogServers {
log.Infof("submitting poisoned precertificate to %s", server)
var ctclient = client.New(server)
var resp *ct.SignedCertificateTimestamp
resp, err = ctclient.AddPreChain(prechain)
if err != nil {
return nil, cferr.Wrap(cferr.CTError, cferr.PrecertSubmissionFailed, err)
}
sctList = append(sctList, *resp)
}
var serializedSCTList []byte
serializedSCTList, err = serializeSCTList(sctList)
if err != nil {
return nil, cferr.Wrap(cferr.CTError, cferr.Unknown, err)
}
// Serialize again as an octet string before embedding
serializedSCTList, err = asn1.Marshal(serializedSCTList)
if err != nil {
return nil, cferr.Wrap(cferr.CTError, cferr.Unknown, err)
}
var SCTListExtension = pkix.Extension{Id: signer.SCTListOID, Critical: false, Value: serializedSCTList}
certTBS.ExtraExtensions = append(certTBS.ExtraExtensions, SCTListExtension)
}
var signedCert []byte
signedCert, err = s.sign(&certTBS, profile)
if err != nil {
return nil, err
}
if s.db != nil {
var certRecord = &certdb.CertificateRecord{
Serial: certTBS.SerialNumber.String(),
CALabel: req.Label,
Status: "good",
Expiry: certTBS.NotAfter,
PEM: string(signedCert),
}
err = certdb.InsertCertificate(s.db, certRecord)
if err != nil {
return nil, err
}
log.Debug("saved certificate with serial number ", certTBS.SerialNumber)
}
return signedCert, nil
}
func (s *Signer) sign(template *x509.Certificate, profile *config.SigningProfile) (cert []byte, err error) {
pub := template.PublicKey
encodedpub, err := x509.MarshalPKIXPublicKey(pub)
if err != nil {
return
}
pubhash := sha1.New()
pubhash.Write(encodedpub)
if profile == nil {
profile = s.Policy.Default
}
var (
eku []x509.ExtKeyUsage
ku x509.KeyUsage
expiry time.Duration
crlURL, ocspURL string
)
// The third value returned from Usages is a list of unknown key usages.
// This should be used when validating the profile at load, and isn't used
// here.
ku, eku, _ = profile.Usages()
expiry = profile.Expiry
if profile.IssuerURL == nil {
profile.IssuerURL = s.Policy.Default.IssuerURL
}
if ku == 0 && len(eku) == 0 {
err = cferr.New(cferr.PolicyError, cferr.NoKeyUsages, errors.New("no key usage available"))
return
}
if expiry == 0 {
expiry = s.Policy.Default.Expiry
}
if crlURL = profile.CRL; crlURL == "" {
crlURL = s.Policy.Default.CRL
}
if ocspURL = profile.OCSP; ocspURL == "" {
ocspURL = s.Policy.Default.OCSP
}
now := time.Now()
serialNumber, err := rand.Int(rand.Reader, new(big.Int).SetInt64(math.MaxInt64))
if err != nil {
err = cferr.New(cferr.CertificateError, cferr.Unknown, err)
}
template.SerialNumber = serialNumber
template.NotBefore = now.Add(-5 * time.Minute).UTC()
template.NotAfter = now.Add(expiry).UTC()
template.KeyUsage = ku
template.ExtKeyUsage = eku
template.BasicConstraintsValid = true
template.IsCA = profile.CA
template.SubjectKeyId = pubhash.Sum(nil)
if ocspURL != "" {
template.OCSPServer = []string{ocspURL}
}
if crlURL != "" {
template.CRLDistributionPoints = []string{crlURL}
}
if len(profile.IssuerURL) != 0 {
template.IssuingCertificateURL = profile.IssuerURL
}
var initRoot bool
if s.CA == nil {
if !template.IsCA {
err = cferr.New(cferr.PolicyError, cferr.InvalidRequest, nil)
return
}
template.DNSNames = nil
s.CA = template
initRoot = true
template.MaxPathLen = 2
} else if template.IsCA {
template.MaxPathLen = 1
template.DNSNames = nil
}
derBytes, err := x509.CreateCertificate(rand.Reader, template, s.CA, pub, s.Priv)
if err != nil {
return
}
if initRoot {
s.CA, err = x509.ParseCertificate(derBytes)
if err != nil {
err = cferr.New(cferr.CertificateError, cferr.ParseFailed, err)
return
}
}
cert = pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
return
}
// FillTemplate is a utility function that tries to load as much of
// the certificate template as possible from the profiles and current
// template. It fills in the key uses, expiration, revocation URLs,
// serial number, and SKI.
func FillTemplate(template *x509.Certificate, defaultProfile, profile *config.SigningProfile, serialSeq string) error {
ski, err := ComputeSKI(template)
var (
eku []x509.ExtKeyUsage
ku x509.KeyUsage
backdate time.Duration
expiry time.Duration
notBefore time.Time
notAfter time.Time
crlURL, ocspURL string
)
// The third value returned from Usages is a list of unknown key usages.
// This should be used when validating the profile at load, and isn't used
// here.
ku, eku, _ = profile.Usages()
if profile.IssuerURL == nil {
profile.IssuerURL = defaultProfile.IssuerURL
}
if ku == 0 && len(eku) == 0 {
return cferr.New(cferr.PolicyError, cferr.NoKeyUsages)
}
if expiry = profile.Expiry; expiry == 0 {
expiry = defaultProfile.Expiry
}
if crlURL = profile.CRL; crlURL == "" {
crlURL = defaultProfile.CRL
}
if ocspURL = profile.OCSP; ocspURL == "" {
ocspURL = defaultProfile.OCSP
}
if backdate = profile.Backdate; backdate == 0 {
backdate = -5 * time.Minute
} else {
backdate = -1 * profile.Backdate
}
if !profile.NotBefore.IsZero() {
notBefore = profile.NotBefore.UTC()
} else {
notBefore = time.Now().Round(time.Minute).Add(backdate).UTC()
}
if !profile.NotAfter.IsZero() {
notAfter = profile.NotAfter.UTC()
} else {
notAfter = notBefore.Add(expiry).UTC()
}
serialNumber, err := rand.Int(rand.Reader, new(big.Int).SetInt64(math.MaxInt64))
if err != nil {
return cferr.Wrap(cferr.CertificateError, cferr.Unknown, err)
}
if serialSeq != "" {
randomPart := fmt.Sprintf("%016X", serialNumber) // 016 ensures we're left-0-padded
_, ok := serialNumber.SetString(serialSeq+randomPart, 16)
if !ok {
return cferr.Wrap(cferr.CertificateError, cferr.SerialSeqParseError, err)
}
}
template.SerialNumber = serialNumber
template.NotBefore = notBefore
template.NotAfter = notAfter
template.KeyUsage = ku
template.ExtKeyUsage = eku
template.BasicConstraintsValid = true
template.IsCA = profile.CA
template.SubjectKeyId = ski
if ocspURL != "" {
template.OCSPServer = []string{ocspURL}
}
if crlURL != "" {
template.CRLDistributionPoints = []string{crlURL}
}
if len(profile.IssuerURL) != 0 {
template.IssuingCertificateURL = profile.IssuerURL
}
if len(profile.Policies) != 0 {
err = addPolicies(template, profile.Policies)
if err != nil {
return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy, err)
}
}
if profile.OCSPNoCheck {
ocspNoCheckExtension := pkix.Extension{
Id: asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 48, 1, 5},
Critical: false,
Value: []byte{0x05, 0x00},
}
template.ExtraExtensions = append(template.ExtraExtensions, ocspNoCheckExtension)
}
return nil
}
func GenerateCertifcate(pkiroot, name string, template *x509.Certificate) error {
// TODO(jclerc): check that pki has been init
var crtPath string
privateKeyPath := filepath.Join(pkiroot, "private", name+".key")
if name == "ca" {
crtPath = filepath.Join(pkiroot, name+".crt")
} else {
crtPath = filepath.Join(pkiroot, "issued", name+".crt")
}
var caCrt *x509.Certificate
var caKey *rsa.PrivateKey
if _, err := os.Stat(privateKeyPath); err == nil {
return fmt.Errorf("a key pair for %v already exists", name)
}
privateKey, err := GeneratePrivateKey(privateKeyPath)
if err != nil {
return fmt.Errorf("generate private key: %v", err)
}
publicKeyBytes, err := asn1.Marshal(*privateKey.Public().(*rsa.PublicKey))
if err != nil {
return fmt.Errorf("marshal public key: %v", err)
}
subjectKeyId := sha1.Sum(publicKeyBytes)
template.SubjectKeyId = subjectKeyId[:]
template.NotBefore = time.Now()
template.SignatureAlgorithm = x509.SHA256WithRSA
if template.IsCA {
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
return fmt.Errorf("failed to generate ca serial number: %s", err)
}
template.SerialNumber = serialNumber
template.KeyUsage = x509.KeyUsageCertSign | x509.KeyUsageCRLSign
template.BasicConstraintsValid = true
template.Issuer = template.Subject
template.AuthorityKeyId = template.SubjectKeyId
caCrt = template
caKey = privateKey
} else {
template.KeyUsage = x509.KeyUsageDigitalSignature | x509.KeyUsageKeyEncipherment
serialNumber, err := NextNumber(pkiroot, "serial")
if err != nil {
return fmt.Errorf("get next serial: %v", err)
}
template.SerialNumber = serialNumber
caCrt, caKey, err = GetCA(pkiroot)
if err != nil {
return fmt.Errorf("get ca: %v", err)
}
}
crt, err := x509.CreateCertificate(rand.Reader, template, caCrt, privateKey.Public(), caKey)
if err != nil {
return fmt.Errorf("create certificate: %v", err)
}
crtFile, err := os.Create(crtPath)
if err != nil {
return fmt.Errorf("create %v: %v", crtPath, err)
}
defer crtFile.Close()
err = pem.Encode(crtFile, &pem.Block{
Type: "CERTIFICATE",
Bytes: crt,
})
if err != nil {
return fmt.Errorf("pem encode crt: %v", err)
}
// I do not think we have to write the ca.crt in the index
if !template.IsCA {
WriteIndex(pkiroot, name, template)
if err != nil {
return fmt.Errorf("write index: %v", err)
}
}
return nil
}
// Sign signs a new certificate based on the PEM-encoded client
// certificate or certificate request with the signing profile,
// specified by profileName.
func (s *Signer) Sign(req signer.SignRequest) (cert []byte, err error) {
profile, err := signer.Profile(s, req.Profile)
if err != nil {
return
}
block, _ := pem.Decode([]byte(req.Request))
if block == nil {
return nil, cferr.New(cferr.CSRError, cferr.DecodeFailed)
}
if block.Type != "CERTIFICATE REQUEST" {
return nil, cferr.Wrap(cferr.CSRError,
cferr.BadRequest, errors.New("not a certificate or csr"))
}
csrTemplate, err := signer.ParseCertificateRequest(s, block.Bytes)
if err != nil {
return nil, err
}
// Copy out only the fields from the CSR authorized by policy.
safeTemplate := x509.Certificate{}
// If the profile contains no explicit whitelist, assume that all fields
// should be copied from the CSR.
if profile.CSRWhitelist == nil {
safeTemplate = *csrTemplate
} else {
if profile.CSRWhitelist.Subject {
safeTemplate.Subject = csrTemplate.Subject
}
if profile.CSRWhitelist.PublicKeyAlgorithm {
safeTemplate.PublicKeyAlgorithm = csrTemplate.PublicKeyAlgorithm
}
if profile.CSRWhitelist.PublicKey {
safeTemplate.PublicKey = csrTemplate.PublicKey
}
if profile.CSRWhitelist.SignatureAlgorithm {
safeTemplate.SignatureAlgorithm = csrTemplate.SignatureAlgorithm
}
if profile.CSRWhitelist.DNSNames {
safeTemplate.DNSNames = csrTemplate.DNSNames
}
if profile.CSRWhitelist.IPAddresses {
safeTemplate.IPAddresses = csrTemplate.IPAddresses
}
}
OverrideHosts(&safeTemplate, req.Hosts)
safeTemplate.Subject = PopulateSubjectFromCSR(req.Subject, safeTemplate.Subject)
// If there is a whitelist, ensure that both the Common Name and SAN DNSNames match
if profile.NameWhitelist != nil {
if safeTemplate.Subject.CommonName != "" {
if profile.NameWhitelist.Find([]byte(safeTemplate.Subject.CommonName)) == nil {
return nil, cferr.New(cferr.PolicyError, cferr.InvalidPolicy)
}
}
for _, name := range safeTemplate.DNSNames {
if profile.NameWhitelist.Find([]byte(name)) == nil {
return nil, cferr.New(cferr.PolicyError, cferr.InvalidPolicy)
}
}
}
if profile.ClientProvidesSerialNumbers {
if req.Serial == nil {
fmt.Printf("xx %#v\n", profile)
return nil, cferr.New(cferr.CertificateError, cferr.MissingSerial)
}
safeTemplate.SerialNumber = req.Serial
} else {
serialNumber, err := rand.Int(rand.Reader, new(big.Int).SetInt64(math.MaxInt64))
if err != nil {
return nil, cferr.Wrap(cferr.CertificateError, cferr.Unknown, err)
}
safeTemplate.SerialNumber = serialNumber
}
return s.sign(&safeTemplate, profile)
}
func SignNewCertificate(privateKey *PrivateKey, template *x509.Certificate, signer *x509.Certificate, signerPrivateKey *PrivateKey) (*Certificate, error) {
if template.PublicKey == nil {
rsaPrivateKey, ok := privateKey.Key.(*rsa.PrivateKey)
if ok {
template.PublicKey = rsaPrivateKey.Public()
}
}
if template.PublicKey == nil {
return nil, fmt.Errorf("PublicKey not set, and cannot be determined from %T", privateKey)
}
now := time.Now()
if template.NotBefore.IsZero() {
template.NotBefore = now.Add(time.Hour * -48)
}
if template.NotAfter.IsZero() {
template.NotAfter = now.Add(time.Hour * 10 * 365 * 24)
}
if template.SerialNumber == nil {
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := crypto_rand.Int(crypto_rand.Reader, serialNumberLimit)
if err != nil {
return nil, fmt.Errorf("error generating certificate serial number: %s", err)
}
template.SerialNumber = serialNumber
}
var parent *x509.Certificate
if signer != nil {
parent = signer
} else {
parent = template
signerPrivateKey = privateKey
}
if template.KeyUsage == 0 {
template.KeyUsage = x509.KeyUsageDigitalSignature | x509.KeyUsageKeyEncipherment
}
if template.ExtKeyUsage == nil {
template.ExtKeyUsage = []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth}
}
//c.SignatureAlgorithm = do we want to overrride?
certificateData, err := x509.CreateCertificate(crypto_rand.Reader, template, parent, template.PublicKey, signerPrivateKey.Key)
if err != nil {
return nil, fmt.Errorf("error creating certificate: %v", err)
}
c := &Certificate{}
c.PublicKey = template.PublicKey
cert, err := x509.ParseCertificate(certificateData)
if err != nil {
return nil, fmt.Errorf("error parsing certificate: %v", err)
}
c.Certificate = cert
return c, nil
}
