Scott Baker | ed4efab | 2020-01-13 19:12:25 -0800 | [diff] [blame] | 1 | package messages |
| 2 | |
| 3 | import ( |
| 4 | "fmt" |
| 5 | "time" |
| 6 | |
| 7 | "github.com/jcmturner/gofork/encoding/asn1" |
| 8 | "gopkg.in/jcmturner/gokrb5.v7/iana/asnAppTag" |
| 9 | "gopkg.in/jcmturner/gokrb5.v7/iana/msgtype" |
| 10 | "gopkg.in/jcmturner/gokrb5.v7/krberror" |
| 11 | "gopkg.in/jcmturner/gokrb5.v7/types" |
| 12 | ) |
| 13 | |
| 14 | /* |
| 15 | AP-REP ::= [APPLICATION 15] SEQUENCE { |
| 16 | pvno [0] INTEGER (5), |
| 17 | msg-type [1] INTEGER (15), |
| 18 | enc-part [2] EncryptedData -- EncAPRepPart |
| 19 | } |
| 20 | |
| 21 | EncAPRepPart ::= [APPLICATION 27] SEQUENCE { |
| 22 | ctime [0] KerberosTime, |
| 23 | cusec [1] Microseconds, |
| 24 | subkey [2] EncryptionKey OPTIONAL, |
| 25 | seq-number [3] UInt32 OPTIONAL |
| 26 | } |
| 27 | */ |
| 28 | |
| 29 | // APRep implements RFC 4120 KRB_AP_REP: https://tools.ietf.org/html/rfc4120#section-5.5.2. |
| 30 | type APRep struct { |
| 31 | PVNO int `asn1:"explicit,tag:0"` |
| 32 | MsgType int `asn1:"explicit,tag:1"` |
| 33 | EncPart types.EncryptedData `asn1:"explicit,tag:2"` |
| 34 | } |
| 35 | |
| 36 | // EncAPRepPart is the encrypted part of KRB_AP_REP. |
| 37 | type EncAPRepPart struct { |
| 38 | CTime time.Time `asn1:"generalized,explicit,tag:0"` |
| 39 | Cusec int `asn1:"explicit,tag:1"` |
| 40 | Subkey types.EncryptionKey `asn1:"optional,explicit,tag:2"` |
| 41 | SequenceNumber int64 `asn1:"optional,explicit,tag:3"` |
| 42 | } |
| 43 | |
| 44 | // Unmarshal bytes b into the APRep struct. |
| 45 | func (a *APRep) Unmarshal(b []byte) error { |
| 46 | _, err := asn1.UnmarshalWithParams(b, a, fmt.Sprintf("application,explicit,tag:%v", asnAppTag.APREP)) |
| 47 | if err != nil { |
| 48 | return processUnmarshalReplyError(b, err) |
| 49 | } |
| 50 | expectedMsgType := msgtype.KRB_AP_REP |
| 51 | if a.MsgType != expectedMsgType { |
| 52 | return krberror.NewErrorf(krberror.KRBMsgError, "message ID does not indicate a KRB_AP_REP. Expected: %v; Actual: %v", expectedMsgType, a.MsgType) |
| 53 | } |
| 54 | return nil |
| 55 | } |
| 56 | |
| 57 | // Unmarshal bytes b into the APRep encrypted part struct. |
| 58 | func (a *EncAPRepPart) Unmarshal(b []byte) error { |
| 59 | _, err := asn1.UnmarshalWithParams(b, a, fmt.Sprintf("application,explicit,tag:%v", asnAppTag.EncAPRepPart)) |
| 60 | if err != nil { |
| 61 | return krberror.Errorf(err, krberror.EncodingError, "AP_REP unmarshal error") |
| 62 | } |
| 63 | return nil |
| 64 | } |