KRBError.go
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// Package messages implements Kerberos 5 message types and methods.
package messages
import (
"fmt"
"time"
"github.com/jcmturner/gofork/encoding/asn1"
"gopkg.in/jcmturner/gokrb5.v7/iana"
"gopkg.in/jcmturner/gokrb5.v7/iana/asnAppTag"
"gopkg.in/jcmturner/gokrb5.v7/iana/errorcode"
"gopkg.in/jcmturner/gokrb5.v7/iana/msgtype"
"gopkg.in/jcmturner/gokrb5.v7/krberror"
"gopkg.in/jcmturner/gokrb5.v7/types"
)
// KRBError implements RFC 4120 KRB_ERROR: https://tools.ietf.org/html/rfc4120#section-5.9.1.
type KRBError struct {
PVNO int `asn1:"explicit,tag:0"`
MsgType int `asn1:"explicit,tag:1"`
CTime time.Time `asn1:"generalized,optional,explicit,tag:2"`
Cusec int `asn1:"optional,explicit,tag:3"`
STime time.Time `asn1:"generalized,explicit,tag:4"`
Susec int `asn1:"explicit,tag:5"`
ErrorCode int32 `asn1:"explicit,tag:6"`
CRealm string `asn1:"generalstring,optional,explicit,tag:7"`
CName types.PrincipalName `asn1:"optional,explicit,tag:8"`
Realm string `asn1:"generalstring,explicit,tag:9"`
SName types.PrincipalName `asn1:"explicit,tag:10"`
EText string `asn1:"generalstring,optional,explicit,tag:11"`
EData []byte `asn1:"optional,explicit,tag:12"`
}
// NewKRBError creates a new KRBError.
func NewKRBError(sname types.PrincipalName, realm string, code int32, etext string) KRBError {
t := time.Now().UTC()
return KRBError{
PVNO: iana.PVNO,
MsgType: msgtype.KRB_ERROR,
STime: t,
Susec: int((t.UnixNano() / int64(time.Microsecond)) - (t.Unix() * 1e6)),
ErrorCode: code,
SName: sname,
Realm: realm,
EText: etext,
}
}
// Unmarshal bytes b into the KRBError struct.
func (k *KRBError) Unmarshal(b []byte) error {
_, err := asn1.UnmarshalWithParams(b, k, fmt.Sprintf("application,explicit,tag:%v", asnAppTag.KRBError))
if err != nil {
return krberror.Errorf(err, krberror.EncodingError, "KRB_ERROR unmarshal error")
}
expectedMsgType := msgtype.KRB_ERROR
if k.MsgType != expectedMsgType {
return krberror.NewErrorf(krberror.KRBMsgError, "message ID does not indicate a KRB_ERROR. Expected: %v; Actual: %v", expectedMsgType, k.MsgType)
}
return nil
}
// Error method implementing error interface on KRBError struct.
func (k KRBError) Error() string {
etxt := fmt.Sprintf("KRB Error: %s", errorcode.Lookup(k.ErrorCode))
if k.EText != "" {
etxt = fmt.Sprintf("%s - %s", etxt, k.EText)
}
return etxt
}
func processUnmarshalReplyError(b []byte, err error) error {
switch err.(type) {
case asn1.StructuralError:
var krberr KRBError
tmperr := krberr.Unmarshal(b)
if tmperr != nil {
return krberror.Errorf(err, krberror.EncodingError, "failed to unmarshal KDC's reply")
}
return krberr
default:
return krberror.Errorf(err, krberror.EncodingError, "failed to unmarshal KDC's reply")
}
}