mirror of
https://github.com/hasura/graphql-engine.git
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399 lines
14 KiB
Haskell
399 lines
14 KiB
Haskell
module Hasura.RQL.DDL.Permission
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( CreatePerm
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, runCreatePerm
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, PermDef(..)
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, InsPerm(..)
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, InsPermDef
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, CreateInsPerm
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, buildInsPermInfo
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, SelPerm(..)
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, SelPermDef
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, CreateSelPerm
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, buildSelPermInfo
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, UpdPerm(..)
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, UpdPermDef
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, CreateUpdPerm
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, buildUpdPermInfo
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, DelPerm(..)
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, DelPermDef
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, CreateDelPerm
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, buildDelPermInfo
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, IsPerm(..)
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, DropPerm
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, runDropPerm
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, dropPermissionInMetadata
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, SetPermComment(..)
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, runSetPermComment
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) where
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import Hasura.Prelude
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import qualified Data.HashMap.Strict as HM
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import qualified Data.HashMap.Strict.InsOrd as OMap
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import qualified Data.HashSet as HS
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import Control.Lens ((.~))
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import Data.Aeson
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import Data.Text.Extended
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import qualified Hasura.SQL.AnyBackend as AB
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import Hasura.Base.Error
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import Hasura.EncJSON
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import Hasura.RQL.DDL.Permission.Internal
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import Hasura.RQL.DML.Internal hiding (askPermInfo)
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import Hasura.RQL.Types
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import Hasura.SQL.Types
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import Hasura.Session
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{- Note [Backend only permissions]
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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As of writing this note, Hasura permission system is meant to be used by the
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frontend. After introducing "Actions", the webhook handlers now can make GraphQL
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mutations to the server with some backend logic. These mutations shouldn't be
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exposed to frontend for any user since they'll bypass the business logic.
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For example:-
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We've a table named "user" and it has a "email" column. We need to validate the
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email address. So we define an action "create_user" and it expects the same inputs
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as "insert_user" mutation (generated by Hasura). Now, a role has permission for both
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actions and insert operation on the table. If the insert permission is not marked
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as "backend_only: true" then it visible to the frontend client along with "creat_user".
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Backend only permissions adds an additional privilege to Hasura generated operations.
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Those are accessable only if the request is made with `x-hasura-admin-secret`
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(if authorization is configured), `x-hasura-use-backend-only-permissions`
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(value must be set to "true"), `x-hasura-role` to identify the role and other
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required session variables.
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backend_only `x-hasura-admin-secret` `x-hasura-use-backend-only-permissions` Result
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------------ --------------------- ------------------------------------- ------
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FALSE ANY ANY Mutation is always visible
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TRUE FALSE ANY Mutation is always hidden
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TRUE TRUE (OR NOT-SET) FALSE Mutation is hidden
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TRUE TRUE (OR NOT-SET) TRUE Mutation is shown
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-}
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type CreateInsPerm b = CreatePerm b (InsPerm b)
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procSetObj
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:: forall b m
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. (QErrM m, BackendMetadata b)
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=> SourceName
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-> TableName b
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-> FieldInfoMap (FieldInfo b)
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-> Maybe (ColumnValues b Value)
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-> m (PreSetColsPartial b, [Text], [SchemaDependency])
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procSetObj source tn fieldInfoMap mObj = do
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(setColTups, deps) <- withPathK "set" $
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fmap unzip $ forM (HM.toList setObj) $ \(pgCol, val) -> do
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ty <- askColumnType fieldInfoMap pgCol $
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"column " <> pgCol <<> " not found in table " <>> tn
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sqlExp <- parseCollectableType (CollectableTypeScalar ty) val
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let dep = mkColDep @b (getDepReason sqlExp) source tn pgCol
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return ((pgCol, sqlExp), dep)
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return (HM.fromList setColTups, depHeaders, deps)
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where
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setObj = fromMaybe mempty mObj
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depHeaders = getDepHeadersFromVal $ Object $ mapKeys toTxt setObj
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getDepReason = bool DRSessionVariable DROnType . isStaticValue
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class (ToJSON a) => IsPerm b a where
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permAccessor
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:: PermAccessor b (PermInfo b a)
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buildPermInfo
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:: (QErrM m, TableCoreInfoRM b m)
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=> SourceName
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-> TableName b
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-> FieldInfoMap (FieldInfo b)
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-> PermDef a
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-> m (WithDeps (PermInfo b a))
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getPermAcc1
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:: PermDef a -> PermAccessor b (PermInfo b a)
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getPermAcc1 _ = permAccessor
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getPermAcc2
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:: DropPerm b a -> PermAccessor b (PermInfo b a)
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getPermAcc2 _ = permAccessor
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addPermToMetadata
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:: PermDef a -> TableMetadata b -> TableMetadata b
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runCreatePerm
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:: forall m b a
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. (UserInfoM m, CacheRWM m, IsPerm b a, MonadError QErr m, MetadataM m, BackendMetadata b)
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=> CreatePerm b a -> m EncJSON
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runCreatePerm (WithTable source tn pd) = do
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tableInfo <- askTabInfo @b source tn
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let permAcc = getPermAcc1 pd
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pt = permAccToType permAcc
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ptText = permTypeToCode pt
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role = _pdRole pd
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metadataObject = MOSourceObjId source
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$ AB.mkAnyBackend
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$ SMOTableObj @b tn
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$ MTOPerm role pt
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onJust (getPermInfoMaybe role permAcc tableInfo) $ const $ throw400 AlreadyExists $
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ptText <> " permission already defined on table " <> tn <<> " with role " <>> role
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buildSchemaCacheFor metadataObject
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$ MetadataModifier
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$ tableMetadataSetter @b source tn %~ addPermToMetadata pd
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pure successMsg
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runDropPerm
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:: forall b a m
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. (IsPerm b a, UserInfoM m, CacheRWM m, MonadError QErr m, MetadataM m, BackendMetadata b)
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=> DropPerm b a
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-> m EncJSON
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runDropPerm dp@(DropPerm source table role) = do
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tabInfo <- askTabInfo source table
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let permType = permAccToType $ getPermAcc2 dp
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void $ askPermInfo tabInfo role $ getPermAcc2 dp
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withNewInconsistentObjsCheck
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$ buildSchemaCache
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$ MetadataModifier
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$ tableMetadataSetter @b source table %~ dropPermissionInMetadata role permType
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return successMsg
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dropPermissionInMetadata
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:: RoleName -> PermType -> TableMetadata b -> TableMetadata b
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dropPermissionInMetadata rn = \case
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PTInsert -> tmInsertPermissions %~ OMap.delete rn
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PTSelect -> tmSelectPermissions %~ OMap.delete rn
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PTDelete -> tmDeletePermissions %~ OMap.delete rn
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PTUpdate -> tmUpdatePermissions %~ OMap.delete rn
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buildInsPermInfo
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:: forall b m
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. (QErrM m, TableCoreInfoRM b m, BackendMetadata b)
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=> SourceName
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-> TableName b
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-> FieldInfoMap (FieldInfo b)
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-> PermDef (InsPerm b)
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-> m (WithDeps (InsPermInfo b))
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buildInsPermInfo source tn fieldInfoMap (PermDef _rn (InsPerm checkCond set mCols mBackendOnly) _) =
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withPathK "permission" $ do
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(be, beDeps) <- withPathK "check" $ procBoolExp source tn fieldInfoMap checkCond
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(setColsSQL, setHdrs, setColDeps) <- procSetObj source tn fieldInfoMap set
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void $ withPathK "columns" $ indexedForM insCols $ \col ->
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askColumnType fieldInfoMap col ""
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let fltrHeaders = getDependentHeaders checkCond
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reqHdrs = fltrHeaders `union` setHdrs
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insColDeps = map (mkColDep @b DRUntyped source tn) insCols
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deps = mkParentDep @b source tn : beDeps ++ setColDeps ++ insColDeps
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insColsWithoutPresets = insCols \\ HM.keys setColsSQL
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return (InsPermInfo (HS.fromList insColsWithoutPresets) be setColsSQL backendOnly reqHdrs, deps)
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where
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backendOnly = Just True == mBackendOnly
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allCols = map pgiColumn $ getCols fieldInfoMap
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insCols = maybe allCols (convColSpec fieldInfoMap) mCols
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type instance PermInfo b (InsPerm b) = InsPermInfo b
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instance (BackendMetadata b) => IsPerm b (InsPerm b) where
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permAccessor = PAInsert
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buildPermInfo = buildInsPermInfo
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addPermToMetadata permDef =
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tmInsertPermissions %~ OMap.insert (_pdRole permDef) permDef
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buildSelPermInfo
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:: forall b m
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. (QErrM m, TableCoreInfoRM b m, BackendMetadata b)
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=> SourceName
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-> TableName b
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-> FieldInfoMap (FieldInfo b)
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-> SelPerm b
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-> m (WithDeps (SelPermInfo b))
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buildSelPermInfo source tn fieldInfoMap sp = withPathK "permission" $ do
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let pgCols = convColSpec fieldInfoMap $ spColumns sp
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(boolExp, boolExpDeps) <- withPathK "filter" $
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procBoolExp source tn fieldInfoMap $ spFilter sp
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-- check if the columns exist
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void $ withPathK "columns" $ indexedForM pgCols $ \pgCol ->
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askColumnType fieldInfoMap pgCol autoInferredErr
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-- validate computed fields
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scalarComputedFields <-
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withPathK "computed_fields" $ indexedForM computedFields $ \fieldName -> do
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computedFieldInfo <- askComputedFieldInfo fieldInfoMap fieldName
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case _cfiReturnType computedFieldInfo of
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CFRScalar _ -> pure fieldName
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CFRSetofTable returnTable -> throw400 NotSupported $
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"select permissions on computed field " <> fieldName
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<<> " are auto-derived from the permissions on its returning table "
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<> returnTable <<> " and cannot be specified manually"
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let deps = mkParentDep @b source tn : boolExpDeps ++ map (mkColDep @b DRUntyped source tn) pgCols
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++ map (mkComputedFieldDep @b DRUntyped source tn) scalarComputedFields
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depHeaders = getDependentHeaders $ spFilter sp
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mLimit = spLimit sp
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withPathK "limit" $ mapM_ onlyPositiveInt mLimit
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let pgColsWithFilter = HM.fromList $ map (, Nothing) pgCols
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scalarComputedFieldsWithFilter = HS.toMap (HS.fromList scalarComputedFields) $> Nothing
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let selPermInfo =
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SelPermInfo pgColsWithFilter scalarComputedFieldsWithFilter boolExp mLimit allowAgg depHeaders
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return ( selPermInfo, deps )
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where
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allowAgg = spAllowAggregations sp
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computedFields = spComputedFields sp
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autoInferredErr = "permissions for relationships are automatically inferred"
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type CreateSelPerm b = CreatePerm b (SelPerm b)
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type instance PermInfo b (SelPerm b) = SelPermInfo b
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instance (BackendMetadata b) => IsPerm b (SelPerm b) where
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permAccessor = PASelect
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buildPermInfo source tn fieldInfoMap (PermDef _ a _) =
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buildSelPermInfo source tn fieldInfoMap a
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addPermToMetadata permDef =
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tmSelectPermissions %~ OMap.insert (_pdRole permDef) permDef
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type CreateUpdPerm b = CreatePerm b (UpdPerm b)
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buildUpdPermInfo
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:: forall b m
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. (QErrM m, TableCoreInfoRM b m, BackendMetadata b)
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=> SourceName
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-> TableName b
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-> FieldInfoMap (FieldInfo b)
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-> UpdPerm b
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-> m (WithDeps (UpdPermInfo b))
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buildUpdPermInfo source tn fieldInfoMap (UpdPerm colSpec set fltr check) = do
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(be, beDeps) <- withPathK "filter" $
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procBoolExp source tn fieldInfoMap fltr
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checkExpr <- traverse (withPathK "check" . procBoolExp source tn fieldInfoMap) check
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(setColsSQL, setHeaders, setColDeps) <- procSetObj source tn fieldInfoMap set
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-- check if the columns exist
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void $ withPathK "columns" $ indexedForM updCols $ \updCol ->
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askColumnType fieldInfoMap updCol relInUpdErr
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let updColDeps = map (mkColDep @b DRUntyped source tn) updCols
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deps = mkParentDep @b source tn : beDeps ++ maybe [] snd checkExpr ++ updColDeps ++ setColDeps
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depHeaders = getDependentHeaders fltr
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reqHeaders = depHeaders `union` setHeaders
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updColsWithoutPreSets = updCols \\ HM.keys setColsSQL
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return (UpdPermInfo (HS.fromList updColsWithoutPreSets) tn be (fst <$> checkExpr) setColsSQL reqHeaders, deps)
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where
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updCols = convColSpec fieldInfoMap colSpec
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relInUpdErr = "relationships can't be used in update"
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-- TODO see TODO for PermInfo above
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type instance PermInfo b (UpdPerm b) = UpdPermInfo b
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instance (BackendMetadata b) => IsPerm b (UpdPerm b) where
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permAccessor = PAUpdate
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buildPermInfo source tn fieldInfoMap (PermDef _ a _) =
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buildUpdPermInfo source tn fieldInfoMap a
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addPermToMetadata permDef =
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tmUpdatePermissions %~ OMap.insert (_pdRole permDef) permDef
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type CreateDelPerm b = CreatePerm b (DelPerm b)
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buildDelPermInfo
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:: forall b m
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. (QErrM m, TableCoreInfoRM b m, BackendMetadata b)
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=> SourceName
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-> TableName b
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-> FieldInfoMap (FieldInfo b)
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-> DelPerm b
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-> m (WithDeps (DelPermInfo b))
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buildDelPermInfo source tn fieldInfoMap (DelPerm fltr) = do
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(be, beDeps) <- withPathK "filter" $
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procBoolExp source tn fieldInfoMap fltr
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let deps = mkParentDep @b source tn : beDeps
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depHeaders = getDependentHeaders fltr
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return (DelPermInfo tn be depHeaders, deps)
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-- TODO see TODO for PermInfo above
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type instance PermInfo b (DelPerm b) = DelPermInfo b
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instance (BackendMetadata b) => IsPerm b (DelPerm b) where
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permAccessor = PADelete
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buildPermInfo source tn fieldInfoMap (PermDef _ a _) =
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buildDelPermInfo source tn fieldInfoMap a
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addPermToMetadata permDef =
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tmDeletePermissions %~ OMap.insert (_pdRole permDef) permDef
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data SetPermComment b
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= SetPermComment
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{ apSource :: !SourceName
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, apTable :: !(TableName b)
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, apRole :: !RoleName
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, apPermission :: !PermType
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, apComment :: !(Maybe Text)
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} deriving (Generic)
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deriving instance (Backend b) => Show (SetPermComment b)
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deriving instance (Backend b) => Eq (SetPermComment b)
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instance (Backend b) => ToJSON (SetPermComment b) where
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toJSON = genericToJSON hasuraJSON
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instance (Backend b) => FromJSON (SetPermComment b) where
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parseJSON = withObject "Object" $ \o ->
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SetPermComment
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<$> o .:? "source" .!= defaultSource
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<*> o .: "table"
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<*> o .: "role"
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<*> o .: "permission"
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<*> o .:? "comment"
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runSetPermComment
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:: forall b m
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. (QErrM m, CacheRWM m, MetadataM m, BackendMetadata b)
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=> SetPermComment b
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-> m EncJSON
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runSetPermComment (SetPermComment source table roleName permType comment) = do
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tableInfo <- askTabInfo @b source table
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-- assert permission exists and return appropriate permission modifier
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permModifier <- case permType of
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PTInsert -> do
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assertPermDefined roleName PAInsert tableInfo
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pure $ tmInsertPermissions.ix roleName.pdComment .~ comment
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PTSelect -> do
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assertPermDefined roleName PASelect tableInfo
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pure $ tmSelectPermissions.ix roleName.pdComment .~ comment
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PTUpdate -> do
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assertPermDefined roleName PAUpdate tableInfo
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pure $ tmUpdatePermissions.ix roleName.pdComment .~ comment
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PTDelete -> do
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assertPermDefined roleName PADelete tableInfo
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pure $ tmDeletePermissions.ix roleName.pdComment .~ comment
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let metadataObject = MOSourceObjId source
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$ AB.mkAnyBackend
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$ SMOTableObj @b table
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$ MTOPerm roleName permType
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buildSchemaCacheFor metadataObject
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$ MetadataModifier
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$ tableMetadataSetter @b source table %~ permModifier
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pure successMsg
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