package middleware import ( "context" "crypto/elliptic" "encoding/xml" "fmt" "io" "net/http" "net/url" "strings" "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data" apiErr "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors" frostfsErrors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/frostfs/errors" "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs" "git.frostfs.info/TrueCloudLab/policy-engine/pkg/chain" "git.frostfs.info/TrueCloudLab/policy-engine/pkg/engine" "git.frostfs.info/TrueCloudLab/policy-engine/pkg/resource/testutil" "git.frostfs.info/TrueCloudLab/policy-engine/schema/common" "git.frostfs.info/TrueCloudLab/policy-engine/schema/s3" "github.com/nspcc-dev/neo-go/pkg/crypto/keys" "github.com/nspcc-dev/neo-go/pkg/util" "go.uber.org/zap" ) const ( QueryVersionID = "versionId" QueryPrefix = "prefix" QueryDelimiter = "delimiter" QueryMaxKeys = "max-keys" amzTagging = "x-amz-tagging" ) // At the beginning of these operations resources haven't yet been created. var withoutResourceOps = []string{ CreateBucketOperation, CreateMultipartUploadOperation, AbortMultipartUploadOperation, CompleteMultipartUploadOperation, UploadPartOperation, UploadPartCopyOperation, ListPartsOperation, PutObjectOperation, CopyObjectOperation, } type PolicySettings interface { PolicyDenyByDefault() bool ACLEnabled() bool } type FrostFSIDInformer interface { GetUserGroupIDsAndClaims(userHash util.Uint160) ([]string, map[string]string, error) } type XMLDecoder interface { NewXMLDecoder(io.Reader) *xml.Decoder } type ResourceTagging interface { GetBucketTagging(ctx context.Context, bktInfo *data.BucketInfo) (map[string]string, error) GetObjectTagging(ctx context.Context, p *data.GetObjectTaggingParams) (string, map[string]string, error) } // BucketResolveFunc is a func to resolve bucket info by name. type BucketResolveFunc func(ctx context.Context, bucket string) (*data.BucketInfo, error) type PolicyConfig struct { Storage engine.ChainRouter FrostfsID FrostFSIDInformer Settings PolicySettings Domains []string Log *zap.Logger BucketResolver BucketResolveFunc Decoder XMLDecoder Tagging ResourceTagging } func PolicyCheck(cfg PolicyConfig) Func { return func(h http.Handler) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { ctx := r.Context() if err := policyCheck(r, cfg); err != nil { reqLogOrDefault(ctx, cfg.Log).Error(logs.PolicyValidationFailed, zap.Error(err)) err = frostfsErrors.UnwrapErr(err) if _, wrErr := WriteErrorResponse(w, GetReqInfo(ctx), err); wrErr != nil { reqLogOrDefault(ctx, cfg.Log).Error(logs.FailedToWriteResponse, zap.Error(wrErr)) } return } h.ServeHTTP(w, r) }) } } func policyCheck(r *http.Request, cfg PolicyConfig) error { reqType, bktName, objName := getBucketObject(r, cfg.Domains) req, userKey, userGroups, err := getPolicyRequest(r, cfg, reqType, bktName, objName) if err != nil { return err } var bktInfo *data.BucketInfo if reqType != noneType && !strings.HasSuffix(req.Operation(), CreateBucketOperation) { bktInfo, err = cfg.BucketResolver(r.Context(), bktName) if err != nil { return err } } reqInfo := GetReqInfo(r.Context()) target := engine.NewRequestTargetWithNamespace(reqInfo.Namespace) if bktInfo != nil { cnrTarget := engine.ContainerTarget(bktInfo.CID.EncodeToString()) target.Container = &cnrTarget } if userKey != nil { entityName := fmt.Sprintf("%s:%s", reqInfo.Namespace, userKey.Address()) uTarget := engine.UserTarget(entityName) target.User = &uTarget } gts := make([]engine.Target, len(userGroups)) for i, group := range userGroups { entityName := fmt.Sprintf("%s:%s", reqInfo.Namespace, group) gts[i] = engine.GroupTarget(entityName) } target.Groups = gts st, found, err := cfg.Storage.IsAllowed(chain.S3, target, req) if err != nil { return err } if !found { st = chain.NoRuleFound } switch { case st == chain.Allow: return nil case st != chain.NoRuleFound: return apiErr.GetAPIErrorWithError(apiErr.ErrAccessDenied, fmt.Errorf("policy check: %s", st.String())) } isAPE := !cfg.Settings.ACLEnabled() if bktInfo != nil { isAPE = bktInfo.APEEnabled } if isAPE && cfg.Settings.PolicyDenyByDefault() { return apiErr.GetAPIErrorWithError(apiErr.ErrAccessDenied, fmt.Errorf("policy check: %s", st.String())) } return nil } func getPolicyRequest(r *http.Request, cfg PolicyConfig, reqType ReqType, bktName string, objName string) (*testutil.Request, *keys.PublicKey, []string, error) { var ( owner string groups []string tags map[string]string pk *keys.PublicKey ) ctx := r.Context() bd, err := GetBoxData(ctx) if err == nil && bd.Gate.BearerToken != nil { pk, err = keys.NewPublicKeyFromBytes(bd.Gate.BearerToken.SigningKeyBytes(), elliptic.P256()) if err != nil { return nil, nil, nil, fmt.Errorf("parse pubclic key from btoken: %w", err) } owner = pk.Address() groups, tags, err = cfg.FrostfsID.GetUserGroupIDsAndClaims(pk.GetScriptHash()) if err != nil { return nil, nil, nil, fmt.Errorf("get group ids: %w", err) } } op := determineOperation(r, reqType) var res string switch reqType { case objectType: res = fmt.Sprintf(s3.ResourceFormatS3BucketObject, bktName, objName) default: res = fmt.Sprintf(s3.ResourceFormatS3Bucket, bktName) } properties, err := determineProperties(r, cfg.Decoder, cfg.BucketResolver, cfg.Tagging, reqType, op, bktName, objName, owner, groups, tags) if err != nil { return nil, nil, nil, fmt.Errorf("determine properties: %w", err) } reqLogOrDefault(r.Context(), cfg.Log).Debug(logs.PolicyRequest, zap.String("action", op), zap.String("resource", res), zap.Any("properties", properties)) return testutil.NewRequest(op, testutil.NewResource(res, nil), properties), pk, groups, nil } type ReqType int const ( noneType ReqType = iota bucketType objectType ) func getBucketObject(r *http.Request, domains []string) (reqType ReqType, bktName string, objName string) { for _, domain := range domains { ind := strings.Index(r.Host, "."+domain) if ind == -1 { continue } bkt := r.Host[:ind] if obj := strings.TrimPrefix(r.URL.Path, "/"); obj != "" { return objectType, bkt, obj } return bucketType, bkt, "" } bktObj := strings.TrimPrefix(r.URL.Path, "/") if bktObj == "" { return noneType, "", "" } if ind := strings.IndexByte(bktObj, '/'); ind != -1 && bktObj[ind+1:] != "" { return objectType, bktObj[:ind], bktObj[ind+1:] } return bucketType, strings.TrimSuffix(bktObj, "/"), "" } func determineOperation(r *http.Request, reqType ReqType) (operation string) { switch reqType { case objectType: operation = determineObjectOperation(r) case bucketType: operation = determineBucketOperation(r) default: operation = determineGeneralOperation(r) } return "s3:" + operation } func determineBucketOperation(r *http.Request) string { query := r.URL.Query() switch r.Method { case http.MethodOptions: return OptionsOperation case http.MethodHead: return HeadBucketOperation case http.MethodGet: switch { case query.Has(UploadsQuery): return ListMultipartUploadsOperation case query.Has(LocationQuery): return GetBucketLocationOperation case query.Has(PolicyQuery): return GetBucketPolicyOperation case query.Has(LifecycleQuery): return GetBucketLifecycleOperation case query.Has(EncryptionQuery): return GetBucketEncryptionOperation case query.Has(CorsQuery): return GetBucketCorsOperation case query.Has(ACLQuery): return GetBucketACLOperation case query.Has(WebsiteQuery): return GetBucketWebsiteOperation case query.Has(AccelerateQuery): return GetBucketAccelerateOperation case query.Has(RequestPaymentQuery): return GetBucketRequestPaymentOperation case query.Has(LoggingQuery): return GetBucketLoggingOperation case query.Has(ReplicationQuery): return GetBucketReplicationOperation case query.Has(TaggingQuery): return GetBucketTaggingOperation case query.Has(ObjectLockQuery): return GetBucketObjectLockConfigOperation case query.Has(VersioningQuery): return GetBucketVersioningOperation case query.Has(NotificationQuery): return GetBucketNotificationOperation case query.Has(EventsQuery): return ListenBucketNotificationOperation case query.Has(VersionsQuery): return ListBucketObjectVersionsOperation case query.Get(ListTypeQuery) == "2" && query.Get(MetadataQuery) == "true": return ListObjectsV2MOperation case query.Get(ListTypeQuery) == "2": return ListObjectsV2Operation default: return ListObjectsV1Operation } case http.MethodPut: switch { case query.Has(CorsQuery): return PutBucketCorsOperation case query.Has(ACLQuery): return PutBucketACLOperation case query.Has(LifecycleQuery): return PutBucketLifecycleOperation case query.Has(EncryptionQuery): return PutBucketEncryptionOperation case query.Has(PolicyQuery): return PutBucketPolicyOperation case query.Has(ObjectLockQuery): return PutBucketObjectLockConfigOperation case query.Has(TaggingQuery): return PutBucketTaggingOperation case query.Has(VersioningQuery): return PutBucketVersioningOperation case query.Has(NotificationQuery): return PutBucketNotificationOperation default: return CreateBucketOperation } case http.MethodPost: switch { case query.Has(DeleteQuery): return DeleteMultipleObjectsOperation default: return PostObjectOperation } case http.MethodDelete: switch { case query.Has(CorsQuery): return DeleteBucketCorsOperation case query.Has(WebsiteQuery): return DeleteBucketWebsiteOperation case query.Has(TaggingQuery): return DeleteBucketTaggingOperation case query.Has(PolicyQuery): return DeleteBucketPolicyOperation case query.Has(LifecycleQuery): return DeleteBucketLifecycleOperation case query.Has(EncryptionQuery): return DeleteBucketEncryptionOperation default: return DeleteBucketOperation } } return "UnmatchedBucketOperation" } func determineObjectOperation(r *http.Request) string { query := r.URL.Query() switch r.Method { case http.MethodHead: return HeadObjectOperation case http.MethodGet: switch { case query.Has(UploadIDQuery): return ListPartsOperation case query.Has(ACLQuery): return GetObjectACLOperation case query.Has(TaggingQuery): return GetObjectTaggingOperation case query.Has(RetentionQuery): return GetObjectRetentionOperation case query.Has(LegalQuery): return GetObjectLegalHoldOperation case query.Has(AttributesQuery): return GetObjectAttributesOperation default: return GetObjectOperation } case http.MethodPut: switch { case query.Has(PartNumberQuery) && query.Has(UploadIDQuery) && r.Header.Get("X-Amz-Copy-Source") != "": return UploadPartCopyOperation case query.Has(PartNumberQuery) && query.Has(UploadIDQuery): return UploadPartOperation case query.Has(ACLQuery): return PutObjectACLOperation case query.Has(TaggingQuery): return PutObjectTaggingOperation case r.Header.Get("X-Amz-Copy-Source") != "": return CopyObjectOperation case query.Has(RetentionQuery): return PutObjectRetentionOperation case query.Has(LegalHoldQuery): return PutObjectLegalHoldOperation default: return PutObjectOperation } case http.MethodPost: switch { case query.Has(UploadIDQuery): return CompleteMultipartUploadOperation case query.Has(UploadsQuery): return CreateMultipartUploadOperation default: return SelectObjectContentOperation } case http.MethodDelete: switch { case query.Has(UploadIDQuery): return AbortMultipartUploadOperation case query.Has(TaggingQuery): return DeleteObjectTaggingOperation default: return DeleteObjectOperation } } return "UnmatchedObjectOperation" } func determineGeneralOperation(r *http.Request) string { if r.Method == http.MethodGet { return ListBucketsOperation } return "UnmatchedOperation" } func determineProperties(r *http.Request, decoder XMLDecoder, resolver BucketResolveFunc, tagging ResourceTagging, reqType ReqType, op, bktName, objName, owner string, groups []string, tags map[string]string) (map[string]string, error) { res := map[string]string{ s3.PropertyKeyOwner: owner, common.PropertyKeyFrostFSIDGroupID: chain.FormCondSliceContainsValue(groups), common.PropertyKeyFrostFSSourceIP: GetReqInfo(r.Context()).RemoteHost, } queries := GetReqInfo(r.Context()).URL.Query() for k, v := range tags { res[fmt.Sprintf(common.PropertyKeyFormatFrostFSIDUserClaim, k)] = v } if reqType == objectType { if versionID := queries.Get(QueryVersionID); len(versionID) > 0 { res[s3.PropertyKeyVersionID] = versionID } } if reqType == bucketType && (strings.HasSuffix(op, ListObjectsV1Operation) || strings.HasSuffix(op, ListObjectsV2Operation) || strings.HasSuffix(op, ListBucketObjectVersionsOperation) || strings.HasSuffix(op, ListMultipartUploadsOperation)) { if prefix := queries.Get(QueryPrefix); len(prefix) > 0 { res[s3.PropertyKeyPrefix] = prefix } if delimiter := queries.Get(QueryDelimiter); len(delimiter) > 0 { res[s3.PropertyKeyDelimiter] = delimiter } if maxKeys := queries.Get(QueryMaxKeys); len(maxKeys) > 0 { res[s3.PropertyKeyMaxKeys] = maxKeys } } tags, err := determineTags(r, decoder, resolver, tagging, reqType, op, bktName, objName, queries.Get(QueryVersionID)) if err != nil { return nil, fmt.Errorf("determine tags: %w", err) } for k, v := range tags { res[k] = v } res[s3.PropertyKeyAccessBoxAttrMFA] = "false" attrs, err := GetAccessBoxAttrs(r.Context()) if err == nil { for _, attr := range attrs { res[fmt.Sprintf(s3.PropertyKeyFormatAccessBoxAttr, attr.Key())] = attr.Value() } } return res, nil } func determineTags(r *http.Request, decoder XMLDecoder, resolver BucketResolveFunc, tagging ResourceTagging, reqType ReqType, op, bktName, objName, versionID string) (map[string]string, error) { res, err := determineRequestTags(r, decoder, op) if err != nil { return nil, fmt.Errorf("determine request tags: %w", err) } tags, err := determineResourceTags(r.Context(), reqType, op, bktName, objName, versionID, resolver, tagging) if err != nil { return nil, fmt.Errorf("determine resource tags: %w", err) } for k, v := range tags { res[k] = v } return res, nil } func determineRequestTags(r *http.Request, decoder XMLDecoder, op string) (map[string]string, error) { tags := make(map[string]string) if strings.HasSuffix(op, PutObjectTaggingOperation) || strings.HasSuffix(op, PutBucketTaggingOperation) { tagging := new(data.Tagging) if err := decoder.NewXMLDecoder(r.Body).Decode(tagging); err != nil { return nil, fmt.Errorf("%w: %s", apiErr.GetAPIError(apiErr.ErrMalformedXML), err.Error()) } GetReqInfo(r.Context()).Tagging = tagging for _, tag := range tagging.TagSet { tags[fmt.Sprintf(s3.PropertyKeyFormatRequestTag, tag.Key)] = tag.Value } } if tagging := r.Header.Get(amzTagging); len(tagging) > 0 { queries, err := url.ParseQuery(tagging) if err != nil { return nil, apiErr.GetAPIError(apiErr.ErrInvalidArgument) } for key := range queries { tags[fmt.Sprintf(s3.PropertyKeyFormatRequestTag, key)] = queries.Get(key) } } return tags, nil } func determineResourceTags(ctx context.Context, reqType ReqType, op, bktName, objName, versionID string, resolver BucketResolveFunc, tagging ResourceTagging) (map[string]string, error) { tags := make(map[string]string) if reqType != bucketType && reqType != objectType { return tags, nil } for _, withoutResOp := range withoutResourceOps { if strings.HasSuffix(op, withoutResOp) { return tags, nil } } bktInfo, err := resolver(ctx, bktName) if err != nil { return nil, fmt.Errorf("get bucket info: %w", err) } if reqType == bucketType { tags, err = tagging.GetBucketTagging(ctx, bktInfo) if err != nil { return nil, fmt.Errorf("get bucket tagging: %w", err) } } if reqType == objectType { tagPrm := &data.GetObjectTaggingParams{ ObjectVersion: &data.ObjectVersion{ BktInfo: bktInfo, ObjectName: objName, VersionID: versionID, }, } _, tags, err = tagging.GetObjectTagging(ctx, tagPrm) if err != nil { return nil, fmt.Errorf("get object tagging: %w", err) } } res := make(map[string]string, len(tags)) for k, v := range tags { res[fmt.Sprintf(s3.PropertyKeyFormatResourceTag, k)] = v } return res, nil }