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|
package authz
import (
"context"
"net/http"
"path/filepath"
v1 "github.com/authzed/authzed-go/proto/authzed/api/v1"
authzed "github.com/authzed/authzed-go/v1"
core "github.com/envoyproxy/go-control-plane/envoy/config/core/v3"
auth "github.com/envoyproxy/go-control-plane/envoy/service/auth/v3"
types "github.com/envoyproxy/go-control-plane/envoy/type/v3"
"github.com/xlgmokha/x/pkg/log"
"github.com/xlgmokha/x/pkg/x"
"gitlab.com/gitlab-org/software-supply-chain-security/authorization/authzd.git/pkg/pls"
status "google.golang.org/genproto/googleapis/rpc/status"
"google.golang.org/grpc/codes"
)
var StaticAssets []string = []string{".png", ".css", ".html", ".js", ".ico"}
type CheckService struct {
client *authzed.Client
auth.UnimplementedAuthorizationServer
}
func NewCheckService(client *authzed.Client) auth.AuthorizationServer {
return &CheckService{
client: client,
}
}
func (svc *CheckService) Check(ctx context.Context, request *auth.CheckRequest) (*auth.CheckResponse, error) {
if svc.isAuthorized(ctx, request) {
return svc.OK(ctx), nil
}
return svc.Denied(ctx), nil
}
func (svc *CheckService) isAuthorized(ctx context.Context, r *auth.CheckRequest) bool {
if !svc.validRequest(ctx, r) {
return false
}
log.WithFields(ctx, svc.fieldsFor(r))
if svc.isStaticAsset(ctx, r) {
return true
}
if x.IsZero(svc.client) {
return false
}
response, err := svc.client.CheckPermission(ctx, svc.mapFrom(ctx, r))
if err != nil {
pls.LogError(ctx, err)
return false
}
return response.Permissionship == v1.CheckPermissionResponse_PERMISSIONSHIP_HAS_PERMISSION
}
func (svc *CheckService) isStaticAsset(ctx context.Context, r *auth.CheckRequest) bool {
if r.Attributes.Request.Http.Method != http.MethodGet {
return false
}
extension := filepath.Ext(r.Attributes.Request.Http.Path)
return x.Contains(StaticAssets, func(item string) bool {
return item == extension
})
}
func (svc *CheckService) validRequest(ctx context.Context, r *auth.CheckRequest) bool {
return x.IsPresent(r) &&
x.IsPresent(r.Attributes) &&
x.IsPresent(r.Attributes.Request) &&
x.IsPresent(r.Attributes.Request.Http)
}
func (svc *CheckService) OK(ctx context.Context) *auth.CheckResponse {
log.WithFields(ctx, log.Fields{"authorized": true})
return &auth.CheckResponse{
Status: &status.Status{
Code: int32(codes.OK),
},
HttpResponse: &auth.CheckResponse_OkResponse{
OkResponse: &auth.OkHttpResponse{
Headers: []*core.HeaderValueOption{},
HeadersToRemove: []string{},
ResponseHeadersToAdd: []*core.HeaderValueOption{},
},
},
}
}
func (svc *CheckService) Denied(ctx context.Context) *auth.CheckResponse {
log.WithFields(ctx, log.Fields{"authorized": false})
return &auth.CheckResponse{
Status: &status.Status{
Code: int32(codes.PermissionDenied),
},
HttpResponse: &auth.CheckResponse_DeniedResponse{
DeniedResponse: &auth.DeniedHttpResponse{
Status: &types.HttpStatus{
Code: types.StatusCode_Unauthorized,
},
Headers: []*core.HeaderValueOption{},
},
},
}
}
func (svc *CheckService) fieldsFor(r *auth.CheckRequest) log.Fields {
return log.Fields{
"host": r.Attributes.Request.Http.Host,
"id": r.Attributes.Request.Http.Id,
"method": r.Attributes.Request.Http.Method,
"path": r.Attributes.Request.Http.Path,
"protocol": r.Attributes.Request.Http.Protocol,
"request_id": r.Attributes.Request.Http.Headers["x-request-id"],
"scheme": r.Attributes.Request.Http.Scheme,
"subject": r.Attributes.Request.Http.Headers["x-jwt-claim-username"],
}
}
func (svc *CheckService) mapFrom(ctx context.Context, r *auth.CheckRequest) *v1.CheckPermissionRequest {
return &v1.CheckPermissionRequest{
Resource: svc.resourceFrom(ctx, r),
Permission: svc.permissionFrom(ctx, r),
Subject: svc.subjectFrom(ctx, r),
}
}
func (svc *CheckService) resourceFrom(ctx context.Context, r *auth.CheckRequest) *v1.ObjectReference {
return &v1.ObjectReference{
ObjectType: "project",
ObjectId: "1",
}
}
func (svc *CheckService) subjectFrom(ctx context.Context, r *auth.CheckRequest) *v1.SubjectReference {
//TODO:: username is not ideal but it works for demo purposes
username := r.Attributes.Request.Http.Headers["x-jwt-claim-username"]
if x.IsZero(username) {
username = "public"
}
return &v1.SubjectReference{
Object: &v1.ObjectReference{
ObjectType: "user",
ObjectId: username,
},
}
}
func (svc *CheckService) permissionFrom(ctx context.Context, r *auth.CheckRequest) string {
return "read"
}
|
