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authorization.go
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authorization.go
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// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package server
import (
"context"
"fmt"
"net/url"
"strings"
"time"
aauth "github.com/apigee/apigee-remote-service-golib/auth"
libAuth "github.com/apigee/apigee-remote-service-golib/auth"
"github.com/apigee/apigee-remote-service-golib/log"
"github.com/apigee/apigee-remote-service-golib/quota"
core "github.com/envoyproxy/go-control-plane/envoy/api/v2/core"
auth "github.com/envoyproxy/go-control-plane/envoy/service/auth/v2"
envoy_type "github.com/envoyproxy/go-control-plane/envoy/type"
"github.com/gogo/googleapis/google/rpc"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
rpcstatus "google.golang.org/genproto/googleapis/rpc/status"
"google.golang.org/grpc"
)
const (
jwtFilterMetadataKey = "envoy.filters.http.jwt_authn"
)
// AuthorizationServer server
type AuthorizationServer struct {
handler *Handler
}
// Register registers
func (a *AuthorizationServer) Register(s *grpc.Server, handler *Handler) {
auth.RegisterAuthorizationServer(s, a)
a.handler = handler
}
// Check does check
func (a *AuthorizationServer) Check(ctx context.Context, req *auth.CheckRequest) (*auth.CheckResponse, error) {
tracker := prometheusRequestTracker(a.handler)
defer tracker.record()
api, ok := req.Attributes.Request.Http.Headers[a.handler.targetHeader]
if !ok {
log.Debugf("missing target header %s", a.handler.targetHeader)
return a.unauthorized(tracker), nil
}
// check for JWT from Envoy filter
protoBufStruct := req.Attributes.GetMetadataContext().GetFilterMetadata()[jwtFilterMetadataKey]
fieldsMap := protoBufStruct.GetFields()
var claims map[string]interface{}
// TODO: use jwtProviderKey check instead of apiKeyClaim loop when we drop Istio 1.4 support,
// will also need to enable jwtProviderKey for YAML in config
// claimsStruct, ok := fieldsMap[a.handler.jwtProviderKey]
// if ok {
// log.Debugf("Using JWT at provider key: %s", a.handler.jwtProviderKey)
// claims = DecodeToMap(claimsStruct.GetStructValue())
// }
for k, v := range fieldsMap {
vFields := v.GetStructValue().GetFields()
if vFields[a.handler.apiKeyClaim] != nil || vFields["api_product_list"] != nil {
log.Debugf("Using JWT with provider key: %s", k)
claims = DecodeToMap(v.GetStructValue())
}
}
splitPath := strings.SplitN(req.Attributes.Request.Http.Path, "?", 2)
path := splitPath[0]
apiKey, ok := req.Attributes.Request.Http.Headers[a.handler.apiKeyHeader] // grab from header
if !ok && len(splitPath) > 1 { // look in querystring if not in header
if qs, err := url.ParseQuery(splitPath[1]); err == nil {
if keys, ok := qs[a.handler.apiKeyHeader]; ok {
apiKey = keys[0]
}
}
}
authContext, err := a.handler.authMan.Authenticate(a.handler, apiKey, claims, a.handler.apiKeyClaim)
switch err {
case libAuth.ErrNoAuth:
return a.unauthorized(tracker), nil
case libAuth.ErrBadAuth:
return a.denied(tracker, authContext, api), nil
case libAuth.ErrInternalError:
return a.internalError(tracker, err), nil
}
if len(authContext.APIProducts) == 0 {
return a.denied(tracker, authContext, api), nil
}
// match products
products := a.handler.productMan.Resolve(authContext, api, path)
if len(products) == 0 {
return a.denied(tracker, authContext, api), nil
}
// apply quotas to all matched products
var quotaArgs = quota.Args{QuotaAmount: 1}
var exceeded bool
var anyError error
for _, p := range products {
if p.QuotaLimitInt > 0 {
result, err := a.handler.quotaMan.Apply(authContext, p, quotaArgs)
if err != nil {
log.Errorf("quota check: %v", err)
anyError = err
} else if result.Exceeded > 0 {
log.Debugf("quota exceeded: %v", p.Name)
exceeded = true
}
}
}
if anyError != nil {
return a.internalError(tracker, anyError), nil
}
if exceeded {
return a.quotaExceeded(tracker, authContext, api), nil
}
return a.authOK(tracker, authContext, api), nil
}
func (a *AuthorizationServer) authOK(tracker *prometheusRequestMetricTracker, authContext *aauth.Context, api string) *auth.CheckResponse {
headers := makeMetadataHeaders(api, authContext)
headers = append(headers, &core.HeaderValueOption{
Header: &core.HeaderValue{
Key: headerAuthorized,
Value: "true",
},
})
tracker.statusCode = envoy_type.StatusCode_OK
return &auth.CheckResponse{
Status: &rpcstatus.Status{
Code: int32(rpc.OK),
},
HttpResponse: &auth.CheckResponse_OkResponse{
OkResponse: &auth.OkHttpResponse{
Headers: headers,
},
},
}
}
func (a *AuthorizationServer) unauthorized(tracker *prometheusRequestMetricTracker) *auth.CheckResponse {
return a.createDenyResponse(tracker, nil, "", rpc.UNAUTHENTICATED)
}
func (a *AuthorizationServer) internalError(tracker *prometheusRequestMetricTracker, err error) *auth.CheckResponse {
log.Errorf("sending internal error: %v", err)
return a.createDenyResponse(tracker, nil, "", rpc.INTERNAL)
}
func (a *AuthorizationServer) denied(tracker *prometheusRequestMetricTracker, authContext *aauth.Context, api string) *auth.CheckResponse {
return a.createDenyResponse(tracker, authContext, api, rpc.PERMISSION_DENIED)
}
func (a *AuthorizationServer) quotaExceeded(tracker *prometheusRequestMetricTracker, authContext *aauth.Context, api string) *auth.CheckResponse {
return a.createDenyResponse(tracker, authContext, api, rpc.RESOURCE_EXHAUSTED)
}
func (a *AuthorizationServer) createDenyResponse(tracker *prometheusRequestMetricTracker, authContext *aauth.Context, api string, code rpc.Code) *auth.CheckResponse {
// use intended code, not OK
switch code {
case rpc.UNAUTHENTICATED:
tracker.statusCode = envoy_type.StatusCode_Unauthorized
case rpc.INTERNAL:
tracker.statusCode = envoy_type.StatusCode_InternalServerError
case rpc.PERMISSION_DENIED:
tracker.statusCode = envoy_type.StatusCode_Forbidden
case rpc.RESOURCE_EXHAUSTED: // Envoy doesn't automatically map this code, force it
tracker.statusCode = envoy_type.StatusCode_TooManyRequests
}
if a.handler.rejectUnauthorized || authContext == nil { // send reject to client
log.Debugf("sending denied: %s", code.String())
response := &auth.CheckResponse{
Status: &rpcstatus.Status{
Code: int32(code),
},
}
// Envoy doesn't automatically map this code, force it
if code == rpc.RESOURCE_EXHAUSTED {
response.HttpResponse = &auth.CheckResponse_DeniedResponse{
DeniedResponse: &auth.DeniedHttpResponse{
Status: &envoy_type.HttpStatus{
Code: tracker.statusCode,
},
},
}
}
return response
}
// allow request to continue upstream
log.Debugf("sending ok (actual: %s)", code.String())
return &auth.CheckResponse{
Status: &rpcstatus.Status{
Code: int32(rpc.OK),
},
HttpResponse: &auth.CheckResponse_OkResponse{
OkResponse: &auth.OkHttpResponse{
Headers: makeMetadataHeaders(api, authContext),
},
},
}
}
// prometheus metrics
var (
prometheusAuthSeconds = promauto.NewHistogramVec(prometheus.HistogramOpts{
Subsystem: "auth",
Name: "requests_seconds",
Help: "Time taken to process authorization requests by code",
Buckets: prometheus.DefBuckets,
}, []string{"org", "env", "code"})
)
type prometheusRequestMetricTracker struct {
handler *Handler
startTime time.Time
statusCode envoy_type.StatusCode
}
// set statusCode before calling record()
func prometheusRequestTracker(h *Handler) *prometheusRequestMetricTracker {
return &prometheusRequestMetricTracker{
handler: h,
startTime: time.Now(),
statusCode: envoy_type.StatusCode_InternalServerError,
}
}
// set statusCode before calling
func (t *prometheusRequestMetricTracker) record() {
codeLabel := fmt.Sprintf("%d", t.statusCode)
httpDuration := time.Since(t.startTime)
prometheusAuthSeconds.WithLabelValues(t.handler.orgName, t.handler.envName, codeLabel).Observe(httpDuration.Seconds())
}