Elia Battiston | 4750d3c | 2022-07-14 13:24:56 +0000 | [diff] [blame] | 1 | package messages |
| 2 | |
| 3 | import ( |
| 4 | "fmt" |
| 5 | "time" |
| 6 | |
| 7 | "github.com/jcmturner/gofork/encoding/asn1" |
| 8 | "github.com/jcmturner/gokrb5/v8/iana/asnAppTag" |
| 9 | "github.com/jcmturner/gokrb5/v8/iana/msgtype" |
| 10 | "github.com/jcmturner/gokrb5/v8/krberror" |
| 11 | "github.com/jcmturner/gokrb5/v8/types" |
| 12 | ) |
| 13 | |
| 14 | // APRep implements RFC 4120 KRB_AP_REP: https://tools.ietf.org/html/rfc4120#section-5.5.2. |
| 15 | type APRep struct { |
| 16 | PVNO int `asn1:"explicit,tag:0"` |
| 17 | MsgType int `asn1:"explicit,tag:1"` |
| 18 | EncPart types.EncryptedData `asn1:"explicit,tag:2"` |
| 19 | } |
| 20 | |
| 21 | // EncAPRepPart is the encrypted part of KRB_AP_REP. |
| 22 | type EncAPRepPart struct { |
| 23 | CTime time.Time `asn1:"generalized,explicit,tag:0"` |
| 24 | Cusec int `asn1:"explicit,tag:1"` |
| 25 | Subkey types.EncryptionKey `asn1:"optional,explicit,tag:2"` |
| 26 | SequenceNumber int64 `asn1:"optional,explicit,tag:3"` |
| 27 | } |
| 28 | |
| 29 | // Unmarshal bytes b into the APRep struct. |
| 30 | func (a *APRep) Unmarshal(b []byte) error { |
| 31 | _, err := asn1.UnmarshalWithParams(b, a, fmt.Sprintf("application,explicit,tag:%v", asnAppTag.APREP)) |
| 32 | if err != nil { |
| 33 | return processUnmarshalReplyError(b, err) |
| 34 | } |
| 35 | expectedMsgType := msgtype.KRB_AP_REP |
| 36 | if a.MsgType != expectedMsgType { |
| 37 | return krberror.NewErrorf(krberror.KRBMsgError, "message ID does not indicate a KRB_AP_REP. Expected: %v; Actual: %v", expectedMsgType, a.MsgType) |
| 38 | } |
| 39 | return nil |
| 40 | } |
| 41 | |
| 42 | // Unmarshal bytes b into the APRep encrypted part struct. |
| 43 | func (a *EncAPRepPart) Unmarshal(b []byte) error { |
| 44 | _, err := asn1.UnmarshalWithParams(b, a, fmt.Sprintf("application,explicit,tag:%v", asnAppTag.EncAPRepPart)) |
| 45 | if err != nil { |
| 46 | return krberror.Errorf(err, krberror.EncodingError, "AP_REP unmarshal error") |
| 47 | } |
| 48 | return nil |
| 49 | } |