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servertcert.go
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/
servertcert.go
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/*
Copyright IBM Corp. 2016 All Rights Reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package lib
import (
"crypto/x509"
"fmt"
"io/ioutil"
"net/http"
cfsslapi "github.com/cloudflare/cfssl/api"
cerr "github.com/cloudflare/cfssl/errors"
"github.com/cloudflare/cfssl/log"
"github.com/hyperledger/fabric-ca/api"
"github.com/hyperledger/fabric-ca/lib/tcert"
"github.com/hyperledger/fabric-ca/util"
"github.com/hyperledger/fabric/bccsp"
)
// Handler for tcert requests
type tcertHandler struct {
server *Server
}
// newTCertHandler is constructor for tcert handler
func newTCertHandler(server *Server) (h http.Handler, err error) {
handler := &cfsslapi.HTTPHandler{
Handler: &tcertHandler{server: server},
Methods: []string{"POST"},
}
return handler, nil
}
// Handle a tcert request
func (h *tcertHandler) Handle(w http.ResponseWriter, r *http.Request) error {
err := h.handle(w, r)
if err != nil {
return cerr.NewBadRequest(err)
}
return nil
}
func (h *tcertHandler) handle(w http.ResponseWriter, r *http.Request) error {
// Read and unmarshall the request body
body, err := ioutil.ReadAll(r.Body)
if err != nil {
return fmt.Errorf("Failure reading request body: %s", err)
}
req := &api.GetTCertBatchRequestNet{}
err = util.Unmarshal(body, req, "tcert request")
if err != nil {
return err
}
// Get the CA targeted by this request
ca := h.server.caMap[r.Header.Get(caHdrName)]
// Get an X509 certificate from the authorization header associated with the caller
cert, err := getCertFromAuthHdr(r)
if err != nil {
return err
}
// Get the user's attribute values and affiliation path
id := tcert.GetEnrollmentIDFromCert(cert)
attrs, affiliationPath, err := h.getUserInfo(id, req.AttrNames, ca)
if err != nil {
return err
}
// Get the prekey associated with the affiliation path
prekey, err := ca.keyTree.GetKey(affiliationPath)
if err != nil {
return fmt.Errorf("Failed to get prekey for identity %s: %s", id, err)
}
// TODO: When the TCert library is based on BCCSP, we will pass the prekey
// directly. Converting the SKI to a string is a temporary kludge
// which isn't correct.
prekeyStr := string(prekey.SKI())
// Call the tcert library to get the batch of tcerts
tcertReq := &tcert.GetBatchRequest{
Count: req.Count,
Attrs: attrs,
EncryptAttrs: req.EncryptAttrs,
ValidityPeriod: req.ValidityPeriod,
PreKey: prekeyStr,
}
resp, err := ca.tcertMgr.GetBatch(tcertReq, cert)
if err != nil {
return err
}
// Write the response
cfsslapi.SendResponse(w, resp)
// Success
return nil
}
// getUserinfo returns the users requested attribute values and user's affiliation path
func (h *tcertHandler) getUserInfo(id string, attrNames []string, ca *CA) ([]tcert.Attribute, []string, error) {
user, err := ca.registry.GetUser(id, attrNames)
if err != nil {
return nil, nil, err
}
if err != nil {
log.Fatal("Failed to get RootPreKey")
return nil, nil, err
}
var attrs []tcert.Attribute
for _, name := range attrNames {
value := user.GetAttribute(name)
if value != "" {
attrs = append(attrs, tcert.Attribute{Name: name, Value: value})
}
}
return attrs, user.GetAffiliationPath(), nil
}
// Get the X509 certificate from the authorization header of the request
func getCertFromAuthHdr(r *http.Request) (*x509.Certificate, error) {
authHdr := r.Header.Get("authorization")
if authHdr == "" {
return nil, errNoAuthHdr
}
cert, _, _, err := util.DecodeToken(authHdr)
if err != nil {
return nil, err
}
return cert, nil
}
// genRootKey generates a new root key
func genRootKey(csp bccsp.BCCSP) (bccsp.Key, error) {
opts := &bccsp.AES256KeyGenOpts{Temporary: true}
return csp.KeyGen(opts)
}