func (ca *CA) newCertificate(id string, pub *ecdsa.PublicKey, timestamp int64, opt ...pkix.Extension) ([]byte, error) {
Trace.Println("creating certificate for " + id)
notBefore := time.Now()
notAfter := notBefore.Add(time.Hour * 24 * 90)
isCA := ca.cert == nil
tmpl := x509.Certificate{
SerialNumber: big.NewInt(1),
Subject: pkix.Name{
CommonName: "OBC",
Organization: []string{"IBM"},
Country: []string{"US"},
},
NotBefore: notBefore,
NotAfter: notAfter,
SubjectKeyId: []byte{1, 2, 3, 4},
SignatureAlgorithm: x509.ECDSAWithSHA384,
KeyUsage: x509.KeyUsageDigitalSignature,
BasicConstraintsValid: true,
IsCA: isCA,
}
if len(opt) > 0 {
tmpl.Extensions = opt
tmpl.ExtraExtensions = opt
}
parent := ca.cert
if isCA {
parent = &tmpl
}
raw, err := x509.CreateCertificate(
rand.Reader,
&tmpl,
parent,
pub,
ca.priv,
)
if isCA && err != nil {
Panic.Panicln(err)
}
hash := sha3.New384()
hash.Write(raw)
if _, err = ca.db.Exec("INSERT INTO Certificates (id, timestamp, cert, hash) VALUES (?, ?, ?, ?)", id, timestamp, raw, hash.Sum(nil)); err != nil {
if isCA {
Panic.Panicln(err)
} else {
Error.Println(err)
}
}
return raw, err
}
// addPolicies adds Certificate Policies and optional Policy Qualifiers to a
// certificate, based on the input config. Go's x509 library allows setting
// Certificate Policies easily, but does not support nested Policy Qualifiers
// under those policies. So we need to construct the ASN.1 structure ourselves.
func addPolicies(template *x509.Certificate, policies []config.CertificatePolicy) error {
asn1PolicyList := []policyInformation{}
for _, policy := range policies {
pi := policyInformation{
// The PolicyIdentifier is an OID assigned to a given issuer.
PolicyIdentifier: asn1.ObjectIdentifier(policy.ID),
}
switch policy.Type {
case "id-qt-unotice":
pi.UserNoticePolicyQualifiers = []userNoticePolicyQualifier{
userNoticePolicyQualifier{
PolicyQualifierID: iDQTUserNotice,
Qualifier: userNotice{
ExplicitText: policy.Qualifier,
},
},
}
case "id-qt-cps":
pi.PolicyQualifiers = []policyQualifier{
policyQualifier{
PolicyQualifierID: iDQTUserNotice,
Qualifier: policy.Qualifier,
},
}
pi.PolicyQualifiers = []policyQualifier{
policyQualifier{
PolicyQualifierID: iDQTCertificationPracticeStatement,
Qualifier: policy.Qualifier,
},
}
case "":
// Empty qualifier type is fine: Include this Certificate Policy, but
// don't include a Policy Qualifier.
default:
return errors.New("Invalid qualifier type in Policies " + policy.Type)
}
asn1PolicyList = append(asn1PolicyList, pi)
}
asn1Bytes, err := asn1.Marshal(asn1PolicyList)
if err != nil {
return err
}
template.ExtraExtensions = append(template.ExtraExtensions, pkix.Extension{
Id: asn1.ObjectIdentifier{2, 5, 29, 32},
Critical: false,
Value: asn1Bytes,
})
return nil
}
// NewRSAcert creates a new RSA x509 self-signed certificate
func NewRSAcert(uri string, name string, priv *rsa.PrivateKey) (*tls.Certificate, error) {
uri = "URI: " + uri
template := x509.Certificate{
SerialNumber: new(big.Int).SetInt64(42),
Subject: pkix.Name{
CommonName: name,
Organization: []string{"WebID"},
// Country: []string{"US"},
},
NotBefore: notBefore,
NotAfter: notAfter,
BasicConstraintsValid: true,
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth},
}
rawValues := []asn1.RawValue{
{Class: 2, Tag: 6, Bytes: []byte(uri)},
}
values, err := asn1.Marshal(rawValues)
if err != nil {
return nil, err
}
template.ExtraExtensions = []pkix.Extension{{Id: subjectAltName, Value: values}}
keyPEM := bytes.NewBuffer(nil)
err = pem.Encode(keyPEM, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(priv)})
if err != nil {
return nil, err
}
derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
if err != nil {
return nil, err
}
certPEM := bytes.NewBuffer(nil)
err = pem.Encode(certPEM, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
if err != nil {
return nil, err
}
cert, err := tls.X509KeyPair(certPEM.Bytes(), keyPEM.Bytes())
if err != nil {
return nil, err
}
return &cert, nil
}
func (ca *CA) newCertificateFromSpec(spec *CertificateSpec) ([]byte, error) {
notBefore := spec.GetNotBefore()
notAfter := spec.GetNotAfter()
parent := ca.cert
isCA := parent == nil
tmpl := x509.Certificate{
SerialNumber: spec.GetSerialNumber(),
Subject: pkix.Name{
CommonName: spec.GetCommonName(),
Organization: []string{spec.GetOrganization()},
Country: []string{spec.GetCountry()},
},
NotBefore: *notBefore,
NotAfter: *notAfter,
SubjectKeyId: *spec.GetSubjectKeyID(),
SignatureAlgorithm: spec.GetSignatureAlgorithm(),
KeyUsage: spec.GetUsage(),
BasicConstraintsValid: true,
IsCA: isCA,
}
if len(*spec.GetExtensions()) > 0 {
tmpl.Extensions = *spec.GetExtensions()
tmpl.ExtraExtensions = *spec.GetExtensions()
}
if isCA {
parent = &tmpl
}
raw, err := x509.CreateCertificate(
rand.Reader,
&tmpl,
parent,
spec.GetPublicKey(),
ca.priv,
)
if isCA && err != nil {
caLogger.Panic(err)
}
return raw, err
}
func (ca *CA) newCertificate(id string, pub interface{}, usage x509.KeyUsage, ext []pkix.Extension) ([]byte, error) {
notBefore := time.Now()
notAfter := notBefore.Add(time.Hour * 24 * 90)
parent := ca.cert
isCA := parent == nil
tmpl := x509.Certificate{
SerialNumber: big.NewInt(1),
Subject: pkix.Name{
CommonName: id,
Organization: []string{"IBM"},
Country: []string{"US"},
},
NotBefore: notBefore,
NotAfter: notAfter,
SubjectKeyId: []byte{1, 2, 3, 4},
SignatureAlgorithm: x509.ECDSAWithSHA384,
KeyUsage: usage,
BasicConstraintsValid: true,
IsCA: isCA,
}
if len(ext) > 0 {
tmpl.Extensions = ext
tmpl.ExtraExtensions = ext
}
if isCA {
parent = &tmpl
}
raw, err := x509.CreateCertificate(
rand.Reader,
&tmpl,
parent,
pub,
ca.priv,
)
if isCA && err != nil {
Panic.Panicln(err)
}
return raw, err
}
// NewSPKACx509 creates a new x509 self-signed cert based on the SPKAC value
func NewSPKACx509(uri string, name string, spkacBase64 string) ([]byte, error) {
public, err := ParseSPKAC(spkacBase64)
if err != nil {
return nil, err
}
pubKey := public.(*rsa.PublicKey)
rsaPub, err := x509.MarshalPKIXPublicKey(pubKey)
if err != nil {
return nil, err
}
h := sha1.New()
pubSha1 := h.Sum(rsaPub)[:20]
priv, err := rsa.GenerateKey(rand.Reader, 1024)
if err != nil {
return nil, err
}
template := x509.Certificate{
SerialNumber: new(big.Int).SetInt64(42),
Subject: pkix.Name{
CommonName: name,
Organization: []string{"WebID"},
// Country: []string{"US"},
},
NotBefore: notBefore,
NotAfter: notAfter,
SubjectKeyId: pubSha1,
BasicConstraintsValid: true,
}
// add WebID in the subjectAltName field
var rawValues []asn1.RawValue
rawValues = append(rawValues, asn1.RawValue{Class: 2, Tag: 6, Bytes: []byte(uri)})
values, err := asn1.Marshal(rawValues)
if err != nil {
return nil, err
}
template.ExtraExtensions = []pkix.Extension{{Id: subjectAltName, Value: values}}
template.Extensions = template.ExtraExtensions
certDerBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, public, priv)
return certDerBytes, nil
}
// Vouch a self-signed certificate that is about to be created with an Ed25519 signature.
func Vouch(signPub *[ed25519.PublicKeySize]byte, signPriv *[ed25519.PrivateKeySize]byte, cert *x509.Certificate, tlsPub interface{}) error {
// note: this is so early the cert is not serialized yet, can't use those fields
tlsPubDer, err := x509.MarshalPKIXPublicKey(tlsPub)
if err != nil {
return err
}
msg := make([]byte, 0, len(prefix)+8+len(tlsPubDer))
msg = append(msg, prefix...)
var now [8]byte
binary.LittleEndian.PutUint64(now[:], uint64(cert.NotAfter.Unix()))
msg = append(msg, now[:]...)
msg = append(msg, tlsPubDer...)
env := make([]byte, 0, ed25519.PublicKeySize+ed25519.SignatureSize)
env = append(env, signPub[:]...)
sig := ed25519.Sign(signPriv, msg)
env = append(env, sig[:]...)
ext := pkix.Extension{Id: oid, Value: env}
cert.ExtraExtensions = append(cert.ExtraExtensions, ext)
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
}
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)
}
// 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
// and SKI.
func FillTemplate(template *x509.Certificate, defaultProfile, profile *config.SigningProfile) 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()
}
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
}
// 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
}