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issuer.go
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issuer.go
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// Copyright 2019 Anapaya Systems
//
// 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 cert
import (
"bytes"
"encoding/json"
"errors"
"github.com/scionproto/scion/go/lib/common"
"github.com/scionproto/scion/go/lib/scrypto"
)
var (
// ErrIssuerTRCVersionNotSet indicates the issuer TRC version is not set.
ErrIssuerTRCVersionNotSet = errors.New("issuer.trc_version not set")
)
// Issuer is the Issuer certificate.
type Issuer struct {
Base
// Issuer holds the TRC Version. Since the issuer certificate is
// self-signed, the issuing AS in the TRC is the same as the subject of this
// certificate.
Issuer IssuerTRC `json:"issuer"`
// CertificateType ensures the correct certificate type when marshalling.
CertificateType TypeIssuer `json:"certificate_type"`
}
// Validate checks that the certificate is in a valid format.
func (c *Issuer) Validate() error {
if err := c.Base.Validate(); err != nil {
return err
}
if err := c.validateKeys(true); err != nil {
return err
}
return nil
}
// UnmarshalJSON checks that all fields are set.
func (c *Issuer) UnmarshalJSON(b []byte) error {
var cAlias issuerAlias
dec := json.NewDecoder(bytes.NewReader(b))
dec.DisallowUnknownFields()
if err := dec.Decode(&cAlias); err != nil {
return err
}
if err := cAlias.checkAllSet(); err != nil {
return err
}
*c = Issuer{
Base: cAlias.Base,
Issuer: *cAlias.Issuer,
CertificateType: *cAlias.CertificateType,
}
return nil
}
type issuerAlias struct {
Base
Issuer *IssuerTRC `json:"issuer"`
CertificateType *TypeIssuer `json:"certificate_type"`
}
func (c *issuerAlias) checkAllSet() error {
if err := c.Base.checkAllSet(); err != nil {
return err
}
switch {
case c.Issuer == nil:
return ErrIssuerNotSet
case c.CertificateType == nil:
return ErrCertificateTypeNotSet
}
return nil
}
// issuerTRCAlias is necessary to avoid an infinite recursion when unmarshalling.
type issuerTRCAlias IssuerTRC
// IssuerTRC identifies the TRC that authenticates the issuer certificate. The
// issuer certificate is self-signed, thus, the issuing AS and TRC ISD are
// implied by the subject.
type IssuerTRC struct {
// TRCVersion is the version of the issuing TRC.
TRCVersion scrypto.Version `json:"trc_version"`
}
// UnmarshalJSON checks that all fields are set.
func (i *IssuerTRC) UnmarshalJSON(b []byte) error {
dec := json.NewDecoder(bytes.NewReader(b))
dec.DisallowUnknownFields()
if err := dec.Decode((*issuerTRCAlias)(i)); err != nil {
return err
}
return i.checkAllSet()
}
func (i *IssuerTRC) checkAllSet() error {
if i.TRCVersion == 0 {
return ErrIssuerTRCVersionNotSet
}
return nil
}
const TypeIssuerJSON = "issuer"
// TypeIssuer indicates an AS certificate.
type TypeIssuer struct{}
// UnmarshalText checks that the certificate type matches.
func (TypeIssuer) UnmarshalText(b []byte) error {
if TypeIssuerJSON != string(b) {
return common.NewBasicError(ErrInvalidCertificateType, nil,
"expected", TypeIssuerJSON, "actual", string(b))
}
return nil
}
// MarshalText returns the AS certificate type.
func (TypeIssuer) MarshalText() ([]byte, error) {
return []byte(TypeIssuerJSON), nil
}