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