github.com/silveraid/fabric-ca@v1.1.0-preview.0.20180127000700-71974f53ab08/lib/util.go

/*
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/tls"
	"crypto/x509"
	"encoding/hex"
	"encoding/json"
	"encoding/pem"
	"fmt"
	"io/ioutil"
	"net/http"
	"strings"

	"github.com/pkg/errors"

	"github.com/cloudflare/cfssl/log"
	"github.com/hyperledger/fabric-ca/api"
	"github.com/hyperledger/fabric-ca/lib/spi"
	"github.com/hyperledger/fabric-ca/util"
	"github.com/spf13/viper"
)

var clientAuthTypes = map[string]tls.ClientAuthType{
	"noclientcert":               tls.NoClientCert,
	"requestclientcert":          tls.RequestClientCert,
	"requireanyclientcert":       tls.RequireAnyClientCert,
	"verifyclientcertifgiven":    tls.VerifyClientCertIfGiven,
	"requireandverifyclientcert": tls.RequireAndVerifyClientCert,
}

// GetCertID returns both the serial number and AKI (Authority Key ID) for the certificate
func GetCertID(bytes []byte) (string, string, error) {
	cert, err := BytesToX509Cert(bytes)
	if err != nil {
		return "", "", err
	}
	serial := util.GetSerialAsHex(cert.SerialNumber)
	aki := hex.EncodeToString(cert.AuthorityKeyId)
	return serial, aki, nil
}

// BytesToX509Cert converts bytes (PEM or DER) to an X509 certificate
func BytesToX509Cert(bytes []byte) (*x509.Certificate, error) {
	dcert, _ := pem.Decode(bytes)
	if dcert != nil {
		bytes = dcert.Bytes
	}
	cert, err := x509.ParseCertificate(bytes)
	if err != nil {
		return nil, errors.Wrap(err, "Buffer was neither PEM nor DER encoding")
	}
	return cert, err
}

// LoadPEMCertPool loads a pool of PEM certificates from list of files
func LoadPEMCertPool(certFiles []string) (*x509.CertPool, error) {
	certPool := x509.NewCertPool()

	if len(certFiles) > 0 {
		for _, cert := range certFiles {
			log.Debugf("Reading cert file: %s", cert)
			pemCerts, err := ioutil.ReadFile(cert)
			if err != nil {
				return nil, err
			}

			log.Debugf("Appending cert %s to pool", cert)
			if !certPool.AppendCertsFromPEM(pemCerts) {
				return nil, errors.New("Failed to load cert pool")
			}
		}
	}

	return certPool, nil
}

// UnmarshalConfig unmarshals a configuration file
func UnmarshalConfig(config interface{}, vp *viper.Viper, configFile string,
	server bool) error {

	vp.SetConfigFile(configFile)
	err := vp.ReadInConfig()
	if err != nil {
		return errors.Wrapf(err, "Failed to read config file '%s'", configFile)
	}

	err = vp.Unmarshal(config)
	if err != nil {
		return errors.Wrapf(err, "Incorrect format in file '%s'", configFile)
	}
	if server {
		serverCfg := config.(*ServerConfig)
		err = vp.Unmarshal(&serverCfg.CAcfg)
		if err != nil {
			return errors.Wrapf(err, "Incorrect format in file '%s'", configFile)
		}
	}
	return nil
}

func getMaxEnrollments(userMaxEnrollments int, caMaxEnrollments int) (int, error) {
	log.Debugf("Max enrollment value verification - User specified max enrollment: %d, CA max enrollment: %d", userMaxEnrollments, caMaxEnrollments)
	if userMaxEnrollments < -1 {
		return 0, errors.Errorf("Max enrollment in registration request may not be less than -1, but was %d", userMaxEnrollments)
	}
	switch caMaxEnrollments {
	case -1:
		if userMaxEnrollments == 0 {
			// The user is requesting the matching limit of the CA, so gets infinite
			return caMaxEnrollments, nil
		}
		// There is no CA max enrollment limit, so simply use the user requested value
		return userMaxEnrollments, nil
	case 0:
		// The CA max enrollment is 0, so registration is disabled.
		return 0, errors.New("Registration is disabled")
	default:
		switch userMaxEnrollments {
		case -1:
			// User requested infinite enrollments is not allowed
			return 0, errors.New("Registration for infinite enrollments is not allowed")
		case 0:
			// User is requesting the current CA maximum
			return caMaxEnrollments, nil
		default:
			// User is requesting a specific positive value; make sure it doesn't exceed the CA maximum.
			if userMaxEnrollments > caMaxEnrollments {
				return 0, errors.Errorf("Requested enrollments (%d) exceeds maximum allowable enrollments (%d)",
					userMaxEnrollments, caMaxEnrollments)
			}
			// otherwise, use the requested maximum
			return userMaxEnrollments, nil
		}
	}
}

// GetUserAffiliation return a joined version version of the affiliation path with '.' as the seperator
func GetUserAffiliation(user spi.User) string {
	return strings.Join(user.GetAffiliationPath(), ".")
}

func addQueryParm(req *http.Request, name, value string) {
	url := req.URL.Query()
	url.Add(name, value)
	req.URL.RawQuery = url.Encode()
}

// IdentityDecoder decodes streams of data coming from the server into an Identity object
func IdentityDecoder(decoder *json.Decoder) error {
	var id api.IdentityInfo
	err := decoder.Decode(&id)
	if err != nil {
		return err
	}
	fmt.Printf("Name: %s, Type: %s, Affiliation: %s, Max Enrollments: %d, Attributes: %+v\n", id.ID, id.Type, id.Affiliation, id.MaxEnrollments, id.Attributes)
	return nil
}

// AffiliationDecoder decodes streams of data coming from the server into an Affiliation object
func AffiliationDecoder(decoder *json.Decoder) error {
	var aff api.AffiliationInfo
	err := decoder.Decode(&aff)
	if err != nil {
		return err
	}
	fmt.Printf("%s\n", aff.Name)
	return nil
}