forked from TrueCloudLab/frostfs-s3-gw
372 lines
10 KiB
Go
372 lines
10 KiB
Go
package middleware
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import (
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"context"
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"crypto/elliptic"
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"fmt"
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"net/http"
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"strings"
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"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
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apiErr "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
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"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
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"git.frostfs.info/TrueCloudLab/policy-engine/pkg/chain"
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"git.frostfs.info/TrueCloudLab/policy-engine/pkg/engine"
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"git.frostfs.info/TrueCloudLab/policy-engine/pkg/resource/testutil"
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"git.frostfs.info/TrueCloudLab/policy-engine/schema/common"
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"git.frostfs.info/TrueCloudLab/policy-engine/schema/s3"
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"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
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"github.com/nspcc-dev/neo-go/pkg/util"
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"go.uber.org/zap"
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)
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type PolicySettings interface {
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PolicyDenyByDefault() bool
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ACLEnabled() bool
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}
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type FrostFSIDInformer interface {
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GetUserGroupIDs(userHash util.Uint160) ([]string, error)
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}
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// BucketResolveFunc is a func to resolve bucket info by name.
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type BucketResolveFunc func(ctx context.Context, bucket string) (*data.BucketInfo, error)
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type PolicyConfig struct {
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Storage engine.ChainRouter
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FrostfsID FrostFSIDInformer
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Settings PolicySettings
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Domains []string
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Log *zap.Logger
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BucketResolver BucketResolveFunc
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}
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func PolicyCheck(cfg PolicyConfig) Func {
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return func(h http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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ctx := r.Context()
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if err := policyCheck(r, cfg); err != nil {
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reqLogOrDefault(ctx, cfg.Log).Error(logs.PolicyValidationFailed, zap.Error(err))
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WriteErrorResponse(w, GetReqInfo(ctx), err)
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return
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}
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h.ServeHTTP(w, r)
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})
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}
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}
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func policyCheck(r *http.Request, cfg PolicyConfig) error {
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reqType, bktName, objName := getBucketObject(r, cfg.Domains)
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req, err := getPolicyRequest(r, cfg.FrostfsID, reqType, bktName, objName, cfg.Log)
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if err != nil {
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return err
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}
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reqInfo := GetReqInfo(r.Context())
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target := engine.NewRequestTargetWithNamespace(reqInfo.Namespace)
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st, found, err := cfg.Storage.IsAllowed(chain.S3, target, req)
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if err != nil {
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return err
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}
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if !found {
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st = chain.NoRuleFound
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}
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switch {
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case st == chain.Allow:
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return nil
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case st != chain.NoRuleFound:
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return apiErr.GetAPIErrorWithError(apiErr.ErrAccessDenied, fmt.Errorf("policy check: %s", st.String()))
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}
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isAPE, err := isAPEBehavior(r.Context(), req, cfg, reqType, bktName)
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if err != nil {
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return err
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}
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if isAPE && cfg.Settings.PolicyDenyByDefault() {
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return apiErr.GetAPIErrorWithError(apiErr.ErrAccessDenied, fmt.Errorf("policy check: %s", st.String()))
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}
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return nil
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}
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func isAPEBehavior(ctx context.Context, req *testutil.Request, cfg PolicyConfig, reqType ReqType, bktName string) (bool, error) {
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if reqType == noneType ||
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strings.HasSuffix(req.Operation(), CreateBucketOperation) {
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return !cfg.Settings.ACLEnabled(), nil
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}
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bktInfo, err := cfg.BucketResolver(ctx, bktName) // we cannot use reqInfo.BucketName because it hasn't been set yet
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if err != nil {
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return false, err
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}
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return bktInfo.APEEnabled, nil
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}
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func getPolicyRequest(r *http.Request, frostfsid FrostFSIDInformer, reqType ReqType, bktName string, objName string, log *zap.Logger) (*testutil.Request, error) {
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var (
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owner string
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groups []string
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)
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ctx := r.Context()
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bd, err := GetBoxData(ctx)
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if err == nil && bd.Gate.BearerToken != nil {
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pk, err := keys.NewPublicKeyFromBytes(bd.Gate.BearerToken.SigningKeyBytes(), elliptic.P256())
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if err != nil {
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return nil, fmt.Errorf("parse pubclic key from btoken: %w", err)
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}
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owner = pk.Address()
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groups, err = frostfsid.GetUserGroupIDs(pk.GetScriptHash())
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if err != nil {
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return nil, fmt.Errorf("get group ids: %w", err)
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}
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}
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op := determineOperation(r, reqType)
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var res string
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switch reqType {
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case objectType:
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res = fmt.Sprintf(s3.ResourceFormatS3BucketObject, bktName, objName)
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default:
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res = fmt.Sprintf(s3.ResourceFormatS3Bucket, bktName)
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}
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reqLogOrDefault(r.Context(), log).Debug(logs.PolicyRequest, zap.String("action", op),
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zap.String("resource", res), zap.String("owner", owner))
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return testutil.NewRequest(op, testutil.NewResource(res, nil),
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map[string]string{
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s3.PropertyKeyOwner: owner,
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common.PropertyKeyFrostFSIDGroupID: chain.FormCondSliceContainsValue(groups),
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},
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), nil
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}
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type ReqType int
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const (
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noneType ReqType = iota
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bucketType
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objectType
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)
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func getBucketObject(r *http.Request, domains []string) (reqType ReqType, bktName string, objName string) {
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for _, domain := range domains {
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ind := strings.Index(r.Host, "."+domain)
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if ind == -1 {
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continue
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}
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bkt := r.Host[:ind]
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if obj := strings.TrimPrefix(r.URL.Path, "/"); obj != "" {
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return objectType, bkt, obj
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}
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return bucketType, bkt, ""
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}
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bktObj := strings.TrimPrefix(r.URL.Path, "/")
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if bktObj == "" {
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return noneType, "", ""
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}
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if ind := strings.IndexByte(bktObj, '/'); ind != -1 {
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return objectType, bktObj[:ind], bktObj[ind+1:]
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}
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return bucketType, bktObj, ""
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}
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func determineOperation(r *http.Request, reqType ReqType) (operation string) {
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switch reqType {
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case objectType:
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operation = determineObjectOperation(r)
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case bucketType:
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operation = determineBucketOperation(r)
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default:
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operation = determineGeneralOperation(r)
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}
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return "s3:" + operation
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}
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func determineBucketOperation(r *http.Request) string {
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query := r.URL.Query()
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switch r.Method {
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case http.MethodOptions:
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return OptionsOperation
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case http.MethodHead:
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return HeadBucketOperation
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case http.MethodGet:
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switch {
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case query.Has(UploadsQuery):
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return ListMultipartUploadsOperation
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case query.Has(LocationQuery):
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return GetBucketLocationOperation
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case query.Has(PolicyQuery):
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return GetBucketPolicyOperation
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case query.Has(LifecycleQuery):
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return GetBucketLifecycleOperation
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case query.Has(EncryptionQuery):
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return GetBucketEncryptionOperation
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case query.Has(CorsQuery):
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return GetBucketCorsOperation
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case query.Has(ACLQuery):
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return GetBucketACLOperation
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case query.Has(WebsiteQuery):
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return GetBucketWebsiteOperation
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case query.Has(AccelerateQuery):
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return GetBucketAccelerateOperation
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case query.Has(RequestPaymentQuery):
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return GetBucketRequestPaymentOperation
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case query.Has(LoggingQuery):
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return GetBucketLoggingOperation
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case query.Has(ReplicationQuery):
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return GetBucketReplicationOperation
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case query.Has(TaggingQuery):
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return GetBucketTaggingOperation
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case query.Has(ObjectLockQuery):
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return GetBucketObjectLockConfigOperation
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case query.Has(VersioningQuery):
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return GetBucketVersioningOperation
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case query.Has(NotificationQuery):
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return GetBucketNotificationOperation
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case query.Has(EventsQuery):
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return ListenBucketNotificationOperation
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case query.Has(VersionsQuery):
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return ListBucketObjectVersionsOperation
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case query.Get(ListTypeQuery) == "2" && query.Get(MetadataQuery) == "true":
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return ListObjectsV2MOperation
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case query.Get(ListTypeQuery) == "2":
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return ListObjectsV2Operation
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default:
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return ListObjectsV1Operation
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}
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case http.MethodPut:
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switch {
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case query.Has(CorsQuery):
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return PutBucketCorsOperation
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case query.Has(ACLQuery):
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return PutBucketACLOperation
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case query.Has(LifecycleQuery):
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return PutBucketLifecycleOperation
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case query.Has(EncryptionQuery):
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return PutBucketEncryptionOperation
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case query.Has(PolicyQuery):
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return PutBucketPolicyOperation
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case query.Has(ObjectLockQuery):
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return PutBucketObjectLockConfigOperation
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case query.Has(TaggingQuery):
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return PutBucketTaggingOperation
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case query.Has(VersioningQuery):
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return PutBucketVersioningOperation
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case query.Has(NotificationQuery):
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return PutBucketNotificationOperation
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default:
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return CreateBucketOperation
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}
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case http.MethodPost:
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switch {
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case query.Has(DeleteQuery):
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return DeleteMultipleObjectsOperation
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default:
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return PostObjectOperation
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}
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case http.MethodDelete:
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switch {
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case query.Has(CorsQuery):
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return DeleteBucketCorsOperation
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case query.Has(WebsiteQuery):
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return DeleteBucketWebsiteOperation
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case query.Has(TaggingQuery):
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return DeleteBucketTaggingOperation
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case query.Has(PolicyQuery):
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return DeleteBucketPolicyOperation
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case query.Has(LifecycleQuery):
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return DeleteBucketLifecycleOperation
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case query.Has(EncryptionQuery):
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return DeleteBucketEncryptionOperation
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default:
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return DeleteBucketOperation
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}
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}
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return "UnmatchedBucketOperation"
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}
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func determineObjectOperation(r *http.Request) string {
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query := r.URL.Query()
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switch r.Method {
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case http.MethodHead:
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return HeadObjectOperation
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case http.MethodGet:
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switch {
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case query.Has(UploadIDQuery):
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return ListPartsOperation
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case query.Has(ACLQuery):
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return GetObjectACLOperation
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case query.Has(TaggingQuery):
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return GetObjectTaggingOperation
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case query.Has(RetentionQuery):
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return GetObjectRetentionOperation
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case query.Has(LegalQuery):
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return GetObjectLegalHoldOperation
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case query.Has(AttributesQuery):
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return GetObjectAttributesOperation
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default:
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return GetObjectOperation
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}
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case http.MethodPut:
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switch {
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case query.Has(PartNumberQuery) && query.Has(UploadIDQuery) && r.Header.Get("X-Amz-Copy-Source") != "":
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return UploadPartCopyOperation
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case query.Has(PartNumberQuery) && query.Has(UploadIDQuery):
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return UploadPartOperation
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case query.Has(ACLQuery):
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return PutObjectACLOperation
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case query.Has(TaggingQuery):
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return PutObjectTaggingOperation
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case r.Header.Get("X-Amz-Copy-Source") != "":
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return CopyObjectOperation
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case query.Has(RetentionQuery):
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return PutObjectRetentionOperation
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case query.Has(LegalHoldQuery):
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return PutObjectLegalHoldOperation
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default:
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return PutObjectOperation
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}
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case http.MethodPost:
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switch {
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case query.Has(UploadIDQuery):
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return CompleteMultipartUploadOperation
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case query.Has(UploadsQuery):
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return CreateMultipartUploadOperation
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default:
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return SelectObjectContentOperation
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}
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case http.MethodDelete:
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switch {
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case query.Has(UploadIDQuery):
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return AbortMultipartUploadOperation
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case query.Has(TaggingQuery):
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return DeleteObjectTaggingOperation
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default:
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return DeleteObjectOperation
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}
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}
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return "UnmatchedObjectOperation"
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}
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func determineGeneralOperation(r *http.Request) string {
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if r.Method == http.MethodGet {
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return ListBucketsOperation
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}
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return "UnmatchedOperation"
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}
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