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api_generator.go
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api_generator.go
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package api
import (
"encoding/json"
"io/ioutil"
"net/http"
"github.com/cloudflare/cfssl/api/client"
"github.com/cloudflare/cfssl/csr"
"github.com/cloudflare/cfssl/errors"
"github.com/cloudflare/cfssl/log"
"github.com/cloudflare/cfssl/signer"
)
type Validator func(*csr.CertificateRequest) error
// A CertRequest stores a PEM-encoded private key and corresponding
// CSR; this is returned from the CSR generation endpoint.
type CertRequest struct {
Key string `json:"key"`
CSR string `json:"csr"`
}
// A GeneratorHandler accepts JSON-encoded certificate requests and
// returns a new private key and certificate request.
type GeneratorHandler struct {
generator *csr.Generator
}
// NewGeneratorHandler builds a new GeneratorHandler from the
// validation function provided.
func NewGeneratorHandler(validator Validator) (http.Handler, error) {
log.Info("setting up key / CSR generator")
return HttpHandler{&GeneratorHandler{
generator: &csr.Generator{validator},
}, "POST"}, nil
}
// Handle responds to requests for the CA to generate a new private
// key and certificate request on behalf of the client. The format for
// these requests is documented in the API documentation.
func (g *GeneratorHandler) Handle(w http.ResponseWriter, r *http.Request) error {
log.Info("request for CSR")
req := new(csr.CertificateRequest)
body, err := ioutil.ReadAll(r.Body)
if err != nil {
log.Warningf("failed to read request body: %v", err)
return errors.NewBadRequest(err)
}
err = json.Unmarshal(body, req)
if err != nil {
log.Warningf("failed to unmarshal request: %v", err)
return errors.NewBadRequest(err)
}
key, csr, err := g.generator.ProcessRequest(req)
if err != nil {
log.Warningf("failed to process CSR: %v", err)
// The validator returns a *cfssl/errors.HttpError
return err
}
// Both key and csr are returned PEM-encoded.
response := newSuccessResponse(&CertRequest{string(key), string(csr)})
w.Header().Set("Content-Type", "application/json")
enc := json.NewEncoder(w)
err = enc.Encode(response)
return err
}
// A CertGeneratorHandler accepts JSON-encoded certificate requests
// and returns a new private key and signed certificate; it handles
// sending the CSR to the server.
type CertGeneratorHandler struct {
generator *csr.Generator
signer *signer.Signer
}
// NewGeneratorHandler builds a new GeneratorHandler from the
// validation function provided.
func NewCertGeneratorHandler(validator Validator, caFile, caKeyFile string) (http.Handler, error) {
var err error
log.Info("setting up new generator / signer")
cg := new(CertGeneratorHandler)
if cg.signer, err = signer.NewSigner(caFile, caKeyFile, nil); err != nil {
return nil, err
}
cg.generator = &csr.Generator{validator}
return HttpHandler{cg, "POST"}, nil
}
type genSignRequest struct {
Hostname string `json:"hostname"`
Request *csr.CertificateRequest `json:"request"`
Profile string `json:"profile"`
}
// Handle responds to requests for the CA to generate a new private
// key and certificate on behalf of the client. The format for these
// requests is documented in the API documentation.
func (cg *CertGeneratorHandler) Handle(w http.ResponseWriter, r *http.Request) error {
log.Info("request for CSR")
req := new(genSignRequest)
body, err := ioutil.ReadAll(r.Body)
if err != nil {
log.Warningf("failed to read request body: %v", err)
return errors.NewBadRequest(err)
}
err = json.Unmarshal(body, req)
if err != nil {
log.Warningf("failed to unmarshal request: %v", err)
return errors.NewBadRequest(err)
}
key, csr, err := cg.generator.ProcessRequest(req.Request)
if err != nil {
log.Warningf("failed to process CSR: %v", err)
// The validator returns a *cfssl/errors.HttpError
return err
}
certPEM, err := cg.signer.Sign(req.Hostname, csr, req.Profile)
if err != nil {
log.Warningf("failed to sign certificate: %v", err)
return errors.NewBadRequest(err)
}
result := map[string]string{
"private_key": string(key),
"certificate": string(certPEM),
}
return sendResponse(w, result)
}
type RemoteCertGeneratorHandler struct {
generator *csr.Generator
remote *client.Server
}
func NewRemoteCertGenerator(validator Validator, remote string) (http.Handler, error) {
log.Info("setting up a new remote certificate generator")
cg := new(RemoteCertGeneratorHandler)
if cg.remote = client.NewServer(remote); cg.remote == nil {
log.Errorf("invalid address for remote server")
return nil, errors.New(errors.DialError, errors.Unknown, nil)
}
cg.generator = &csr.Generator{validator}
return HttpHandler{cg, "POST"}, nil
}
func (rcg *RemoteCertGeneratorHandler) Handle(w http.ResponseWriter, r *http.Request) error {
req := new(genSignRequest)
body, err := ioutil.ReadAll(r.Body)
if err != nil {
log.Warningf("failed to read request body: %v", err)
return errors.NewBadRequest(err)
}
err = json.Unmarshal(body, req)
if err != nil {
log.Warningf("failed to unmarshal request: %v", err)
return errors.NewBadRequest(err)
}
csrPEM, key, err := rcg.generator.ProcessRequest(req.Request)
if err != nil {
log.Warningf("failed to process CSR: %v", err)
// The validator returns a *cfssl/errors.HttpError
return err
}
certPEM, err := rcg.remote.Sign(req.Hostname, csrPEM, req.Profile)
if err != nil {
log.Warningf("failed to send CSR to remote signer: %v", err)
return err
}
result := map[string]string{
"private_key": string(key),
"certificate": string(certPEM),
}
return sendResponse(w, result)
}
// CSRValidate contains the default validation logic for certificate requests to
// the API server. This follows the Baseline Requirements for the Issuance and
// Management of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser
// Forum (https://cabforum.org). Specifically, section 10.2.3 ("Information
// Requirements"), states:
//
// "Applicant information MUST include, but not be limited to, at least one
// Fully-Qualified Domain Name or IP address to be included in the Certificate’s
// SubjectAltName extension."
func CSRValidate(req *csr.CertificateRequest) error {
if len(req.Hosts) == 0 {
log.Warning("request for CSR is missing the host parameter")
return errors.NewBadRequestMissingParameter("hosts")
}
return nil
}