103 lines
3.7 KiB
Go
103 lines
3.7 KiB
Go
package messages
|
|
|
|
import (
|
|
"fmt"
|
|
"time"
|
|
|
|
"github.com/jcmturner/gofork/encoding/asn1"
|
|
"gopkg.in/jcmturner/gokrb5.v7/crypto"
|
|
"gopkg.in/jcmturner/gokrb5.v7/iana/asnAppTag"
|
|
"gopkg.in/jcmturner/gokrb5.v7/iana/keyusage"
|
|
"gopkg.in/jcmturner/gokrb5.v7/iana/msgtype"
|
|
"gopkg.in/jcmturner/gokrb5.v7/krberror"
|
|
"gopkg.in/jcmturner/gokrb5.v7/types"
|
|
)
|
|
|
|
type marshalKRBCred struct {
|
|
PVNO int `asn1:"explicit,tag:0"`
|
|
MsgType int `asn1:"explicit,tag:1"`
|
|
Tickets asn1.RawValue `asn1:"explicit,tag:2"`
|
|
EncPart types.EncryptedData `asn1:"explicit,tag:3"`
|
|
}
|
|
|
|
// KRBCred implements RFC 4120 KRB_CRED: https://tools.ietf.org/html/rfc4120#section-5.8.1.
|
|
type KRBCred struct {
|
|
PVNO int
|
|
MsgType int
|
|
Tickets []Ticket
|
|
EncPart types.EncryptedData
|
|
DecryptedEncPart EncKrbCredPart
|
|
}
|
|
|
|
// EncKrbCredPart is the encrypted part of KRB_CRED.
|
|
type EncKrbCredPart struct {
|
|
TicketInfo []KrbCredInfo `asn1:"explicit,tag:0"`
|
|
Nouce int `asn1:"optional,explicit,tag:1"`
|
|
Timestamp time.Time `asn1:"generalized,optional,explicit,tag:2"`
|
|
Usec int `asn1:"optional,explicit,tag:3"`
|
|
SAddress types.HostAddress `asn1:"optional,explicit,tag:4"`
|
|
RAddress types.HostAddress `asn1:"optional,explicit,tag:5"`
|
|
}
|
|
|
|
// KrbCredInfo is the KRB_CRED_INFO part of KRB_CRED.
|
|
type KrbCredInfo struct {
|
|
Key types.EncryptionKey `asn1:"explicit,tag:0"`
|
|
PRealm string `asn1:"generalstring,optional,explicit,tag:1"`
|
|
PName types.PrincipalName `asn1:"optional,explicit,tag:2"`
|
|
Flags asn1.BitString `asn1:"optional,explicit,tag:3"`
|
|
AuthTime time.Time `asn1:"generalized,optional,explicit,tag:4"`
|
|
StartTime time.Time `asn1:"generalized,optional,explicit,tag:5"`
|
|
EndTime time.Time `asn1:"generalized,optional,explicit,tag:6"`
|
|
RenewTill time.Time `asn1:"generalized,optional,explicit,tag:7"`
|
|
SRealm string `asn1:"optional,explicit,ia5,tag:8"`
|
|
SName types.PrincipalName `asn1:"optional,explicit,tag:9"`
|
|
CAddr types.HostAddresses `asn1:"optional,explicit,tag:10"`
|
|
}
|
|
|
|
// Unmarshal bytes b into the KRBCred struct.
|
|
func (k *KRBCred) Unmarshal(b []byte) error {
|
|
var m marshalKRBCred
|
|
_, err := asn1.UnmarshalWithParams(b, &m, fmt.Sprintf("application,explicit,tag:%v", asnAppTag.KRBCred))
|
|
if err != nil {
|
|
return processUnmarshalReplyError(b, err)
|
|
}
|
|
expectedMsgType := msgtype.KRB_CRED
|
|
if m.MsgType != expectedMsgType {
|
|
return krberror.NewErrorf(krberror.KRBMsgError, "message ID does not indicate a KRB_CRED. Expected: %v; Actual: %v", expectedMsgType, m.MsgType)
|
|
}
|
|
k.PVNO = m.PVNO
|
|
k.MsgType = m.MsgType
|
|
k.EncPart = m.EncPart
|
|
if len(m.Tickets.Bytes) > 0 {
|
|
k.Tickets, err = unmarshalTicketsSequence(m.Tickets)
|
|
if err != nil {
|
|
return krberror.Errorf(err, krberror.EncodingError, "error unmarshaling tickets within KRB_CRED")
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// DecryptEncPart decrypts the encrypted part of a KRB_CRED.
|
|
func (k *KRBCred) DecryptEncPart(key types.EncryptionKey) error {
|
|
b, err := crypto.DecryptEncPart(k.EncPart, key, keyusage.KRB_CRED_ENCPART)
|
|
if err != nil {
|
|
return krberror.Errorf(err, krberror.DecryptingError, "error decrypting KRB_CRED EncPart")
|
|
}
|
|
var denc EncKrbCredPart
|
|
err = denc.Unmarshal(b)
|
|
if err != nil {
|
|
return krberror.Errorf(err, krberror.EncodingError, "error unmarshaling encrypted part of KRB_CRED")
|
|
}
|
|
k.DecryptedEncPart = denc
|
|
return nil
|
|
}
|
|
|
|
// Unmarshal bytes b into the encrypted part of KRB_CRED.
|
|
func (k *EncKrbCredPart) Unmarshal(b []byte) error {
|
|
_, err := asn1.UnmarshalWithParams(b, k, fmt.Sprintf("application,explicit,tag:%v", asnAppTag.EncKrbCredPart))
|
|
if err != nil {
|
|
return krberror.Errorf(err, krberror.EncodingError, "error unmarshaling EncKrbCredPart")
|
|
}
|
|
return nil
|
|
}
|