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package sarama
import (
"encoding/binary"
"encoding/hex"
"gopkg.in/jcmturner/gokrb5.v7/credentials"
"gopkg.in/jcmturner/gokrb5.v7/gssapi"
"gopkg.in/jcmturner/gokrb5.v7/iana/keyusage"
"gopkg.in/jcmturner/gokrb5.v7/messages"
"gopkg.in/jcmturner/gokrb5.v7/types"
)
type KafkaGSSAPIHandler struct {
client *MockKerberosClient
badResponse bool
badKeyChecksum bool
}
func (h *KafkaGSSAPIHandler) MockKafkaGSSAPI(buffer []byte) []byte {
// Default payload used for verify
err := h.client.Login() // Mock client construct keys when login
if err != nil {
return nil
}
if h.badResponse { // Returns trash
return []byte{0x00, 0x00, 0x00, 0x01, 0xAD}
}
var pack = gssapi.WrapToken{
Flags: KRB5_USER_AUTH,
EC: 12,
RRC: 0,
SndSeqNum: 3398292281,
Payload: []byte{0x11, 0x00}, // 1100
}
// Compute checksum
if h.badKeyChecksum {
pack.CheckSum = []byte{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}
} else {
err = pack.SetCheckSum(h.client.ASRep.DecryptedEncPart.Key, keyusage.GSSAPI_ACCEPTOR_SEAL)
if err != nil {
return nil
}
}
packBytes, err := pack.Marshal()
if err != nil {
return nil
}
lenBytes := len(packBytes)
response := make([]byte, lenBytes+4)
copy(response[4:], packBytes)
binary.BigEndian.PutUint32(response, uint32(lenBytes))
return response
}
type MockKerberosClient struct {
asReqBytes string
asRepBytes string
ASRep messages.ASRep
credentials *credentials.Credentials
mockError error
errorStage string
}
func (c *MockKerberosClient) Login() error {
if c.errorStage == "login" && c.mockError != nil {
return c.mockError
}
c.asRepBytes = "6b8202e9308202e5a003020105a10302010ba22b30293027a103020113a220041e301c301aa003020112a1131b114" +
"558414d504c452e434f4d636c69656e74a30d1b0b4558414d504c452e434f4da4133011a003020101a10a30081b06636c69656e7" +
"4a5820156618201523082014ea003020105a10d1b0b4558414d504c452e434f4da220301ea003020102a11730151b066b7262746" +
"7741b0b4558414d504c452e434f4da382011430820110a003020112a103020101a28201020481ffdb9891175d106818e61008c51" +
"d0b3462bca92f3bf9d4cfa82de4c4d7aff9994ec87c573e3a3d54dcb2bb79618c76f2bf4a3d006f90d5bdbd049bc18f48be39203" +
"549ca02acaf63f292b12404f9b74c34b83687119d8f56552ccc0c50ebee2a53bb114c1b4619bb1d5d31f0f49b4d40a08a9b4c046" +
"2e1398d0b648be1c0e50c552ad16e1d8d8e74263dd0bf0ec591e4797dfd40a9a1be4ae830d03a306e053fd7586fef84ffc5e4a83" +
"7c3122bf3e6a40fe87e84019f6283634461b955712b44a5f7386c278bff94ec2c2dc0403247e29c2450e853471ceababf9b8911f" +
"997f2e3010b046d2c49eb438afb0f4c210821e80d4ffa4c9521eb895dcd68610b3feaa682012c30820128a003020112a282011f0" +
"482011bce73cbce3f1dd17661c412005f0f2257c756fe8e98ff97e6ec24b7bab66e5fd3a3827aeeae4757af0c6e892948122d8b2" +
"03c8df48df0ef5d142d0e416d688f11daa0fcd63d96bdd431d02b8e951c664eeff286a2be62383d274a04016d5f0e141da58cb86" +
"331de64063062f4f885e8e9ce5b181ca2fdc67897c5995e0ae1ae0c171a64493ff7bd91bc6d89cd4fce1e2b3ea0a10e34b0d5eda" +
"aa38ee727b50c5632ed1d2f2b457908e616178d0d80b72af209fb8ac9dbaa1768fa45931392b36b6d8c12400f8ded2efaa0654d0" +
"da1db966e8b5aab4706c800f95d559664646041fdb38b411c62fc0fbe0d25083a28562b0e1c8df16e62e9d5626b0addee489835f" +
"eedb0f26c05baa596b69b17f47920aa64b29dc77cfcc97ba47885"
apRepBytes, err := hex.DecodeString(c.asRepBytes)
if err != nil {
return err
}
err = c.ASRep.Unmarshal(apRepBytes)
if err != nil {
return err
}
c.credentials = credentials.New("client", "EXAMPLE.COM").WithPassword("qwerty")
_, err = c.ASRep.DecryptEncPart(c.credentials)
if err != nil {
return err
}
return nil
}
func (c *MockKerberosClient) GetServiceTicket(spn string) (messages.Ticket, types.EncryptionKey, error) {
if c.errorStage == "service_ticket" && c.mockError != nil {
return messages.Ticket{}, types.EncryptionKey{}, c.mockError
}
return c.ASRep.Ticket, c.ASRep.DecryptedEncPart.Key, nil
}
func (c *MockKerberosClient) Domain() string {
return "EXAMPLE.COM"
}
func (c *MockKerberosClient) CName() types.PrincipalName {
var p = types.PrincipalName{
NameType: KRB5_USER_AUTH,
NameString: []string{
"kafka",
"kafka",
},
}
return p
}
func (c *MockKerberosClient) Destroy() {
// Do nothing.
}
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