VOL-1967 move api-server to separate repository
Change-Id: I21b85be74205805be15f8a85e53a903d16785671
diff --git a/vendor/gopkg.in/jcmturner/gokrb5.v7/messages/Ticket.go b/vendor/gopkg.in/jcmturner/gokrb5.v7/messages/Ticket.go
new file mode 100644
index 0000000..49664b8
--- /dev/null
+++ b/vendor/gopkg.in/jcmturner/gokrb5.v7/messages/Ticket.go
@@ -0,0 +1,265 @@
+package messages
+
+import (
+ "crypto/rand"
+ "fmt"
+ "log"
+ "time"
+
+ "github.com/jcmturner/gofork/encoding/asn1"
+ "gopkg.in/jcmturner/gokrb5.v7/asn1tools"
+ "gopkg.in/jcmturner/gokrb5.v7/crypto"
+ "gopkg.in/jcmturner/gokrb5.v7/iana"
+ "gopkg.in/jcmturner/gokrb5.v7/iana/adtype"
+ "gopkg.in/jcmturner/gokrb5.v7/iana/asnAppTag"
+ "gopkg.in/jcmturner/gokrb5.v7/iana/errorcode"
+ "gopkg.in/jcmturner/gokrb5.v7/iana/flags"
+ "gopkg.in/jcmturner/gokrb5.v7/iana/keyusage"
+ "gopkg.in/jcmturner/gokrb5.v7/keytab"
+ "gopkg.in/jcmturner/gokrb5.v7/krberror"
+ "gopkg.in/jcmturner/gokrb5.v7/pac"
+ "gopkg.in/jcmturner/gokrb5.v7/types"
+)
+
+// Reference: https://www.ietf.org/rfc/rfc4120.txt
+// Section: 5.3
+
+// Ticket implements the Kerberos ticket.
+type Ticket struct {
+ TktVNO int `asn1:"explicit,tag:0"`
+ Realm string `asn1:"generalstring,explicit,tag:1"`
+ SName types.PrincipalName `asn1:"explicit,tag:2"`
+ EncPart types.EncryptedData `asn1:"explicit,tag:3"`
+ DecryptedEncPart EncTicketPart `asn1:"optional"` // Not part of ASN1 bytes so marked as optional so unmarshalling works
+}
+
+// EncTicketPart is the encrypted part of the Ticket.
+type EncTicketPart struct {
+ Flags asn1.BitString `asn1:"explicit,tag:0"`
+ Key types.EncryptionKey `asn1:"explicit,tag:1"`
+ CRealm string `asn1:"generalstring,explicit,tag:2"`
+ CName types.PrincipalName `asn1:"explicit,tag:3"`
+ Transited TransitedEncoding `asn1:"explicit,tag:4"`
+ AuthTime time.Time `asn1:"generalized,explicit,tag:5"`
+ StartTime time.Time `asn1:"generalized,explicit,optional,tag:6"`
+ EndTime time.Time `asn1:"generalized,explicit,tag:7"`
+ RenewTill time.Time `asn1:"generalized,explicit,optional,tag:8"`
+ CAddr types.HostAddresses `asn1:"explicit,optional,tag:9"`
+ AuthorizationData types.AuthorizationData `asn1:"explicit,optional,tag:10"`
+}
+
+// TransitedEncoding part of the ticket's encrypted part.
+type TransitedEncoding struct {
+ TRType int32 `asn1:"explicit,tag:0"`
+ Contents []byte `asn1:"explicit,tag:1"`
+}
+
+// NewTicket creates a new Ticket instance.
+func NewTicket(cname types.PrincipalName, crealm string, sname types.PrincipalName, srealm string, flags asn1.BitString, sktab *keytab.Keytab, eTypeID int32, kvno int, authTime, startTime, endTime, renewTill time.Time) (Ticket, types.EncryptionKey, error) {
+ etype, err := crypto.GetEtype(eTypeID)
+ if err != nil {
+ return Ticket{}, types.EncryptionKey{}, krberror.Errorf(err, krberror.EncryptingError, "error getting etype for new ticket")
+ }
+ ks := etype.GetKeyByteSize()
+ kv := make([]byte, ks, ks)
+ rand.Read(kv)
+ sessionKey := types.EncryptionKey{
+ KeyType: eTypeID,
+ KeyValue: kv,
+ }
+ etp := EncTicketPart{
+ Flags: flags,
+ Key: sessionKey,
+ CRealm: crealm,
+ CName: cname,
+ Transited: TransitedEncoding{},
+ AuthTime: authTime,
+ StartTime: startTime,
+ EndTime: endTime,
+ RenewTill: renewTill,
+ }
+ b, err := asn1.Marshal(etp)
+ if err != nil {
+ return Ticket{}, types.EncryptionKey{}, krberror.Errorf(err, krberror.EncodingError, "error marshalling ticket encpart")
+ }
+ b = asn1tools.AddASNAppTag(b, asnAppTag.EncTicketPart)
+ skey, err := sktab.GetEncryptionKey(sname, srealm, kvno, eTypeID)
+ if err != nil {
+ return Ticket{}, types.EncryptionKey{}, krberror.Errorf(err, krberror.EncryptingError, "error getting encryption key for new ticket")
+ }
+ ed, err := crypto.GetEncryptedData(b, skey, keyusage.KDC_REP_TICKET, kvno)
+ if err != nil {
+ return Ticket{}, types.EncryptionKey{}, krberror.Errorf(err, krberror.EncryptingError, "error encrypting ticket encpart")
+ }
+ tkt := Ticket{
+ TktVNO: iana.PVNO,
+ Realm: srealm,
+ SName: sname,
+ EncPart: ed,
+ }
+ return tkt, sessionKey, nil
+}
+
+// Unmarshal bytes b into a Ticket struct.
+func (t *Ticket) Unmarshal(b []byte) error {
+ _, err := asn1.UnmarshalWithParams(b, t, fmt.Sprintf("application,explicit,tag:%d", asnAppTag.Ticket))
+ return err
+}
+
+// Marshal the Ticket.
+func (t *Ticket) Marshal() ([]byte, error) {
+ b, err := asn1.Marshal(*t)
+ if err != nil {
+ return nil, err
+ }
+ b = asn1tools.AddASNAppTag(b, asnAppTag.Ticket)
+ return b, nil
+}
+
+// Unmarshal bytes b into the EncTicketPart struct.
+func (t *EncTicketPart) Unmarshal(b []byte) error {
+ _, err := asn1.UnmarshalWithParams(b, t, fmt.Sprintf("application,explicit,tag:%d", asnAppTag.EncTicketPart))
+ return err
+}
+
+// unmarshalTicket returns a ticket from the bytes provided.
+func unmarshalTicket(b []byte) (t Ticket, err error) {
+ err = t.Unmarshal(b)
+ return
+}
+
+// UnmarshalTicketsSequence returns a slice of Tickets from a raw ASN1 value.
+func unmarshalTicketsSequence(in asn1.RawValue) ([]Ticket, error) {
+ //This is a workaround to a asn1 decoding issue in golang - https://github.com/golang/go/issues/17321. It's not pretty I'm afraid
+ //We pull out raw values from the larger raw value (that is actually the data of the sequence of raw values) and track our position moving along the data.
+ b := in.Bytes
+ // Ignore the head of the asn1 stream (1 byte for tag and those for the length) as this is what tells us its a sequence but we're handling it ourselves
+ p := 1 + asn1tools.GetNumberBytesInLengthHeader(in.Bytes)
+ var tkts []Ticket
+ var raw asn1.RawValue
+ for p < (len(b)) {
+ _, err := asn1.UnmarshalWithParams(b[p:], &raw, fmt.Sprintf("application,tag:%d", asnAppTag.Ticket))
+ if err != nil {
+ return nil, fmt.Errorf("unmarshaling sequence of tickets failed getting length of ticket: %v", err)
+ }
+ t, err := unmarshalTicket(b[p:])
+ if err != nil {
+ return nil, fmt.Errorf("unmarshaling sequence of tickets failed: %v", err)
+ }
+ p += len(raw.FullBytes)
+ tkts = append(tkts, t)
+ }
+ MarshalTicketSequence(tkts)
+ return tkts, nil
+}
+
+// MarshalTicketSequence marshals a slice of Tickets returning an ASN1 raw value containing the ticket sequence.
+func MarshalTicketSequence(tkts []Ticket) (asn1.RawValue, error) {
+ raw := asn1.RawValue{
+ Class: 2,
+ IsCompound: true,
+ }
+ if len(tkts) < 1 {
+ // There are no tickets to marshal
+ return raw, nil
+ }
+ var btkts []byte
+ for i, t := range tkts {
+ b, err := t.Marshal()
+ if err != nil {
+ return raw, fmt.Errorf("error marshaling ticket number %d in sequence of tickets", i+1)
+ }
+ btkts = append(btkts, b...)
+ }
+ // The ASN1 wrapping consists of 2 bytes:
+ // 1st byte -> Identifier Octet - In this case an OCTET STRING (ASN TAG
+ // 2nd byte -> The length (this will be the size indicated in the input bytes + 2 for the additional bytes we add here.
+ // Application Tag:
+ //| Byte: | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 |
+ //| Value: | 0 | 1 | 1 | From the RFC spec 4120 |
+ //| Explanation | Defined by the ASN1 encoding rules for an application tag | A value of 1 indicates a constructed type | The ASN Application tag value |
+ btkts = append(asn1tools.MarshalLengthBytes(len(btkts)), btkts...)
+ btkts = append([]byte{byte(32 + asn1.TagSequence)}, btkts...)
+ raw.Bytes = btkts
+ // If we need to create the full bytes then identifier octet is "context-specific" = 128 + "constructed" + 32 + the wrapping explicit tag (11)
+ //fmt.Fprintf(os.Stderr, "mRaw fb: %v\n", raw.FullBytes)
+ return raw, nil
+}
+
+// DecryptEncPart decrypts the encrypted part of the ticket.
+// The sname argument can be used to specify which service principal's key should be used to decrypt the ticket.
+// If nil is passed as the sname then the service principal specified within the ticket it used.
+func (t *Ticket) DecryptEncPart(keytab *keytab.Keytab, sname *types.PrincipalName) error {
+ if sname == nil {
+ sname = &t.SName
+ }
+ key, err := keytab.GetEncryptionKey(*sname, t.Realm, t.EncPart.KVNO, t.EncPart.EType)
+ if err != nil {
+ return NewKRBError(t.SName, t.Realm, errorcode.KRB_AP_ERR_NOKEY, fmt.Sprintf("Could not get key from keytab: %v", err))
+ }
+ return t.Decrypt(key)
+}
+
+// Decrypt decrypts the encrypted part of the ticket using the key provided.
+func (t *Ticket) Decrypt(key types.EncryptionKey) error {
+ b, err := crypto.DecryptEncPart(t.EncPart, key, keyusage.KDC_REP_TICKET)
+ if err != nil {
+ return fmt.Errorf("error decrypting Ticket EncPart: %v", err)
+ }
+ var denc EncTicketPart
+ err = denc.Unmarshal(b)
+ if err != nil {
+ return fmt.Errorf("error unmarshaling encrypted part: %v", err)
+ }
+ t.DecryptedEncPart = denc
+ return nil
+}
+
+// GetPACType returns a Microsoft PAC that has been extracted from the ticket and processed.
+func (t *Ticket) GetPACType(keytab *keytab.Keytab, sname *types.PrincipalName, l *log.Logger) (bool, pac.PACType, error) {
+ var isPAC bool
+ for _, ad := range t.DecryptedEncPart.AuthorizationData {
+ if ad.ADType == adtype.ADIfRelevant {
+ var ad2 types.AuthorizationData
+ err := ad2.Unmarshal(ad.ADData)
+ if err != nil {
+ l.Printf("PAC authorization data could not be unmarshaled: %v", err)
+ continue
+ }
+ if ad2[0].ADType == adtype.ADWin2KPAC {
+ isPAC = true
+ var p pac.PACType
+ err = p.Unmarshal(ad2[0].ADData)
+ if err != nil {
+ return isPAC, p, fmt.Errorf("error unmarshaling PAC: %v", err)
+ }
+ if sname == nil {
+ sname = &t.SName
+ }
+ key, err := keytab.GetEncryptionKey(*sname, t.Realm, t.EncPart.KVNO, t.EncPart.EType)
+ if err != nil {
+ return isPAC, p, NewKRBError(t.SName, t.Realm, errorcode.KRB_AP_ERR_NOKEY, fmt.Sprintf("Could not get key from keytab: %v", err))
+ }
+ err = p.ProcessPACInfoBuffers(key, l)
+ return isPAC, p, err
+ }
+ }
+ }
+ return isPAC, pac.PACType{}, nil
+}
+
+// Valid checks it the ticket is currently valid. Max duration passed endtime passed in as argument.
+func (t *Ticket) Valid(d time.Duration) (bool, error) {
+ // Check for future tickets or invalid tickets
+ time := time.Now().UTC()
+ if t.DecryptedEncPart.StartTime.Sub(time) > d || types.IsFlagSet(&t.DecryptedEncPart.Flags, flags.Invalid) {
+ return false, NewKRBError(t.SName, t.Realm, errorcode.KRB_AP_ERR_TKT_NYV, "service ticket provided is not yet valid")
+ }
+
+ // Check for expired ticket
+ if time.Sub(t.DecryptedEncPart.EndTime) > d {
+ return false, NewKRBError(t.SName, t.Realm, errorcode.KRB_AP_ERR_TKT_EXPIRED, "service ticket provided has expired")
+ }
+
+ return true, nil
+}