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Introduce STS client grants API and OPA policy integration (#6168)

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This PR introduces two new features

- AWS STS compatible STS API named AssumeRoleWithClientGrants

```
POST /?Action=AssumeRoleWithClientGrants&Token=<jwt>
```

This API endpoint returns temporary access credentials, access
tokens signature types supported by this API

  - RSA keys
  - ECDSA keys

Fetches the required public key from the JWKS endpoints, provides
them as rsa or ecdsa public keys.

- External policy engine support, in this case OPA policy engine

- Credentials are stored on disks
This commit is contained in:
Harshavardhana
2018-10-09 14:00:01 -07:00
committed by kannappanr
parent 16a100b597
commit 54ae364def
76 changed files with 7249 additions and 713 deletions
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122
cmd/jwt.go
View File

@@ -84,57 +84,127 @@ func authenticateURL(accessKey, secretKey string) (string, error) {
return authenticateJWT(accessKey, secretKey, defaultURLJWTExpiry)
}
func keyFuncCallback(jwtToken *jwtgo.Token) (interface{}, error) {
func stsTokenCallback(jwtToken *jwtgo.Token) (interface{}, error) {
if _, ok := jwtToken.Method.(*jwtgo.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("Unexpected signing method: %v", jwtToken.Header["alg"])
}
return []byte(globalServerConfig.GetCredential().SecretKey), nil
if err := jwtToken.Claims.Valid(); err != nil {
return nil, errAuthentication
}
if claims, ok := jwtToken.Claims.(jwtgo.MapClaims); ok {
accessKey, ok := claims["accessKey"].(string)
if !ok {
return nil, errInvalidAccessKeyID
}
if accessKey == globalServerConfig.GetCredential().AccessKey {
return []byte(globalServerConfig.GetCredential().SecretKey), nil
}
if globalIAMSys == nil {
return nil, errInvalidAccessKeyID
}
_, ok = globalIAMSys.GetUser(accessKey)
if !ok {
return nil, errInvalidAccessKeyID
}
return []byte(globalServerConfig.GetCredential().SecretKey), nil
}
return nil, errAuthentication
}
func isAuthTokenValid(tokenString string) bool {
if tokenString == "" {
return false
// Callback function used for parsing
func webTokenCallback(jwtToken *jwtgo.Token) (interface{}, error) {
if _, ok := jwtToken.Method.(*jwtgo.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("Unexpected signing method: %v", jwtToken.Header["alg"])
}
var claims jwtgo.StandardClaims
jwtToken, err := jwtgo.ParseWithClaims(tokenString, &claims, keyFuncCallback)
if err := jwtToken.Claims.Valid(); err != nil {
return nil, errAuthentication
}
if claims, ok := jwtToken.Claims.(*jwtgo.StandardClaims); ok {
if claims.Subject == globalServerConfig.GetCredential().AccessKey {
return []byte(globalServerConfig.GetCredential().SecretKey), nil
}
if globalIAMSys == nil {
return nil, errInvalidAccessKeyID
}
cred, ok := globalIAMSys.GetUser(claims.Subject)
if !ok {
return nil, errInvalidAccessKeyID
}
return []byte(cred.SecretKey), nil
}
return nil, errAuthentication
}
func parseJWTWithClaims(tokenString string, claims jwtgo.Claims) (*jwtgo.Token, error) {
p := &jwtgo.Parser{
SkipClaimsValidation: true,
}
jwtToken, err := p.ParseWithClaims(tokenString, claims, webTokenCallback)
if err != nil {
logger.LogIf(context.Background(), err)
return false
switch e := err.(type) {
case *jwtgo.ValidationError:
if e.Inner == nil {
return nil, errAuthentication
}
return nil, e.Inner
}
return nil, errAuthentication
}
if err = claims.Valid(); err != nil {
logger.LogIf(context.Background(), err)
return false
return jwtToken, nil
}
func isAuthTokenValid(token string) bool {
_, _, err := webTokenAuthenticate(token)
return err == nil
}
func webTokenAuthenticate(token string) (jwtgo.StandardClaims, bool, error) {
var claims = jwtgo.StandardClaims{}
if token == "" {
return claims, false, errNoAuthToken
}
return jwtToken.Valid && claims.Subject == globalServerConfig.GetCredential().AccessKey
jwtToken, err := parseJWTWithClaims(token, &claims)
if err != nil {
return claims, false, err
}
if !jwtToken.Valid {
return claims, false, errAuthentication
}
owner := claims.Subject == globalServerConfig.GetCredential().AccessKey
return claims, owner, nil
}
func isHTTPRequestValid(req *http.Request) bool {
return webRequestAuthenticate(req) == nil
_, _, err := webRequestAuthenticate(req)
return err == nil
}
// Check if the request is authenticated.
// Returns nil if the request is authenticated. errNoAuthToken if token missing.
// Returns errAuthentication for all other errors.
func webRequestAuthenticate(req *http.Request) error {
var claims jwtgo.StandardClaims
jwtToken, err := jwtreq.ParseFromRequestWithClaims(req, jwtreq.AuthorizationHeaderExtractor, &claims, keyFuncCallback)
func webRequestAuthenticate(req *http.Request) (jwtgo.StandardClaims, bool, error) {
var claims = jwtgo.StandardClaims{}
tokStr, err := jwtreq.AuthorizationHeaderExtractor.ExtractToken(req)
if err != nil {
if err == jwtreq.ErrNoTokenInRequest {
return errNoAuthToken
return claims, false, errNoAuthToken
}
return errAuthentication
return claims, false, err
}
if err = claims.Valid(); err != nil {
return errAuthentication
}
if claims.Subject != globalServerConfig.GetCredential().AccessKey {
return errInvalidAccessKeyID
jwtToken, err := parseJWTWithClaims(tokStr, &claims)
if err != nil {
return claims, false, err
}
if !jwtToken.Valid {
return errAuthentication
return claims, false, errAuthentication
}
return nil
owner := claims.Subject == globalServerConfig.GetCredential().AccessKey
return claims, owner, nil
}
func newAuthToken() string {