/
csr.go
178 lines (149 loc) · 4.22 KB
/
csr.go
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package csrprov
import (
"crypto"
"crypto/rand"
"crypto/x509"
"encoding/pem"
"net"
"net/mail"
"github.com/cloudflare/cfssl/signer"
"github.com/cloudflare/cfssl/signer/local"
"github.com/juju/errors"
)
// NewSigningCertificateRequest creates new request for signing certificate
func (c *Provider) NewSigningCertificateRequest(
keyLabel, algo string, keySize int,
CN string,
names []X509Name,
hosts []string,
) *CertificateRequest {
return &CertificateRequest{
KeyRequest: c.NewKeyRequest(keyLabel, algo, keySize, Signing),
CN: CN,
Names: names,
Hosts: hosts,
}
}
// NewRoot creates a new root certificate from the certificate request.
func (c *Provider) NewRoot(req *CertificateRequest) (cert, csrPEM, key []byte, err error) {
// RootCA fixup
policy, err := MakeCAPolicy(req)
if err != nil {
err = errors.Annotate(err, "ca policy failed")
return
}
err = ValidateCSR(req)
if err != nil {
err = errors.Annotate(err, "invalid request")
return
}
csrPEM, gkey, keyID, err := c.ParseCsrRequest(req)
if err != nil {
key = nil
err = errors.Annotate(err, "process request")
return
}
signkey := gkey.(crypto.Signer)
uri, keyBytes, err := c.provider.ExportKey(keyID)
if err != nil {
err = errors.Annotate(err, "key URI")
return
}
if keyBytes == nil {
key = []byte(uri)
} else {
key = keyBytes
}
s, err := local.NewSigner(signkey, nil, signer.DefaultSigAlgo(signkey), policy)
if err != nil {
err = errors.Annotate(err, "create signer")
return
}
signReq := signer.SignRequest{Hosts: req.Hosts, Request: string(csrPEM)}
cert, err = s.Sign(signReq)
return
}
// ProcessCsrRequest takes a certificate request and generates a key and
// CSR from it.
func (c *Provider) ProcessCsrRequest(req *CertificateRequest) (csrPEM, key []byte, keyID string, pub crypto.PublicKey, err error) {
err = ValidateCSR(req)
if err != nil {
err = errors.Annotate(err, "invalid request")
return
}
var priv crypto.PrivateKey
csrPEM, priv, keyID, err = c.ParseCsrRequest(req)
if err != nil {
key = nil
err = errors.Annotate(err, "process request")
return
}
s, ok := priv.(crypto.Signer)
if !ok {
key = nil
err = errors.Annotate(err, "unable to convert key to crypto.Signer")
return
}
pub = s.Public()
uri, keyBytes, err := c.provider.ExportKey(keyID)
if err != nil {
err = errors.Annotate(err, "key URI")
return
}
if keyBytes == nil {
key = []byte(uri)
} else {
key = keyBytes
}
return
}
// ParseCsrRequest takes a certificate request and generates a key and
// CSR from it. It does no validation -- caveat emptor. It will,
// however, fail if the key request is not valid (i.e., an unsupported
// curve or RSA key size). The lack of validation was specifically
// chosen to allow the end user to define a policy and validate the
// request appropriately before calling this function.
func (c *Provider) ParseCsrRequest(req *CertificateRequest) (csr []byte, priv crypto.PrivateKey, keyID string, err error) {
if req.KeyRequest == nil {
err = errors.New("invalid key request")
return
}
logger.Infof("api=ParseCsrRequest, algo=%s, size=%d", req.KeyRequest.Algo(), req.KeyRequest.Size())
priv, err = req.KeyRequest.Generate()
if err != nil {
err = errors.Annotate(err, "generate key")
return
}
var label string
keyID, label, err = c.provider.IdentifyKey(priv)
if err != nil {
err = errors.Annotate(err, "identify key")
return
}
logger.Infof("generated key, id=%q, label=%q", keyID, label)
var tpl = x509.CertificateRequest{
Subject: req.Name(),
SignatureAlgorithm: req.KeyRequest.SigAlgo(),
}
for i := range req.Hosts {
if ip := net.ParseIP(req.Hosts[i]); ip != nil {
tpl.IPAddresses = append(tpl.IPAddresses, ip)
} else if email, err := mail.ParseAddress(req.Hosts[i]); err == nil && email != nil {
tpl.EmailAddresses = append(tpl.EmailAddresses, req.Hosts[i])
} else {
tpl.DNSNames = append(tpl.DNSNames, req.Hosts[i])
}
}
csr, err = x509.CreateCertificateRequest(rand.Reader, &tpl, priv)
if err != nil {
logger.Errorf("failed to generate a CSR: %v", errors.Trace(err))
err = errors.Annotate(err, "generate csr")
return
}
block := pem.Block{
Type: "CERTIFICATE REQUEST",
Bytes: csr,
}
csr = pem.EncodeToMemory(&block)
return
}