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athenz.go
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athenz.go
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package pulsar
import (
"io/ioutil"
"net/http"
"time"
"github.com/pkg/errors"
log "github.com/sirupsen/logrus"
"github.com/yahoo/athenz/clients/go/zts"
"github.com/yahoo/athenz/libs/go/zmssvctoken"
)
type AthenzKey struct {
ID string `json:"id"`
Key string `json:"key"`
}
type AthenzKeys []AthenzKey
type AthenzConfig struct {
ZmsUrl string `json:"zmsUrl"`
ZtsUrl string `json:"ztsUrl"`
ZtsPublicKeys AthenzKeys `json:"ztsPublicKeys"`
ZmsPublicKeys AthenzKeys `json:"zmsPublicKeys"`
}
type AuthenticationDataAthenz struct {
AuthenticationDataProvider
roleToken string
httpHeaderName string
}
func (a *AuthenticationDataAthenz) HasDataForTls() bool {
return false
}
func (a *AuthenticationDataAthenz) GetHttpHeaders() (headers http.Header) {
headers = make(http.Header)
headers.Set(a.httpHeaderName, a.roleToken)
return
}
func (a *AuthenticationDataAthenz) HasDataFromCommand() bool {
return true
}
func (a *AuthenticationDataAthenz) GetCommandData() string {
return a.roleToken
}
func NewAuthenticationDataAthenz(
roleToken, httpHeaderName string,
) (provider *AuthenticationDataAthenz) {
defaultProvider := &defaultAuthenticationDataProvider{}
provider = &AuthenticationDataAthenz{
defaultProvider, roleToken, httpHeaderName,
}
return
}
const (
defaultKeyVersion = "0"
defaultExpiration = 60 * time.Minute
)
var (
defaultRoleTokenMinExpiryTime int32 = 2 * 60 * 60
defaultRoleTokenMaxExpiryTime int32 = 24 * 60 * 60
)
type AuthenticationAthenz struct {
authParams map[string]string
config *Config
}
func (a *AuthenticationAthenz) GetAuthMethodName() (name string) {
name = "athenz" // never use "AuthMethodAthens" in PulsarApi.pb.go
return
}
func (a *AuthenticationAthenz) Configure(authParams map[string]string) {
a.authParams = authParams
}
func (a *AuthenticationAthenz) Start() (err error) {
return
}
func (a *AuthenticationAthenz) GetAuthData() (
provider AuthenticationDataProvider, err error,
) {
privateKeyPath := a.authParams["privateKeyPath"]
domain := a.authParams["tenantDomain"]
service := a.authParams["tenantService"]
keyVersion, ok := a.authParams["keyId"]
if !ok {
keyVersion = defaultKeyVersion
}
var ntoken string
ntoken, err = GetNToken(
privateKeyPath, domain, service, keyVersion, defaultExpiration,
)
if err != nil {
err = errors.Wrap(err, "failed to get ntoken")
return
}
ztsUrl := a.config.AthenzConfig.ZtsUrl + "/zts/v1"
providerDomain := a.authParams["providerDomain"]
var roleToken *zts.RoleToken
roleToken, err = GetRoleToken(
ztsUrl, a.config.AthenzAuthHeader, ntoken, domain, providerDomain, service, "",
)
if err != nil {
err = errors.Wrap(err, "failed to get role token")
return
}
provider = NewAuthenticationDataAthenz(
roleToken.Token, a.config.AthenzAuthHeader,
)
return
}
func GetNToken(
privateKeyPath, domain, service, keyVersion string, expireTime time.Duration,
) (ntoken string, err error) {
var bytes []byte
bytes, err = ioutil.ReadFile(privateKeyPath)
if err != nil {
err = errors.Wrap(err, "failed to read private key file")
return
}
var builder zmssvctoken.TokenBuilder
builder, err = zmssvctoken.NewTokenBuilder(domain, service, bytes, keyVersion)
if err != nil {
err = errors.Wrap(err, "failed to create token builder")
return
}
builder.SetExpiration(expireTime)
token := builder.Token()
ntoken, err = token.Value()
if err != nil {
err = errors.Wrap(err, "failed to get ntoken")
return
}
log.WithFields(log.Fields{
"ntoken": ntoken,
}).Debug("got ntoken")
return
}
func GetRoleToken(
url, authHeader, ntoken, tenantDomain, providerDomain, service, role string,
) (roleToken *zts.RoleToken, err error) {
client := zts.NewClient(url, nil)
client.AddCredentials(authHeader, ntoken)
roleToken, err = client.GetRoleToken(
zts.DomainName(providerDomain), zts.EntityList(role),
&defaultRoleTokenMinExpiryTime, &defaultRoleTokenMaxExpiryTime, "",
)
if err != nil {
err = errors.Wrap(err, "failed to get role token")
return
}
log.WithFields(log.Fields{
"roleToken": roleToken,
}).Debug("got role token")
return
}
func NewAuthenticationAthenz(config *Config) (athenz *AuthenticationAthenz) {
athenz = &AuthenticationAthenz{
config: config,
}
return
}