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259 lines
8.6 KiB
259 lines
8.6 KiB
package vm
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import (
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"fmt"
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. "github.com/tendermint/tendermint/common"
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ptypes "github.com/tendermint/tendermint/permission/types"
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)
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//------------------------------------------------------------------------------------------------
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// Registered SNative contracts
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var RegisteredSNativeContracts = map[Word256]SNativeContract{
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LeftPadWord256([]byte("hasBasePerm")): hasBasePerm,
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LeftPadWord256([]byte("setBasePerm")): setBasePerm,
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LeftPadWord256([]byte("unsetBasePerm")): unsetBasePerm,
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LeftPadWord256([]byte("setGlobalPerm")): setGlobalPerm,
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LeftPadWord256([]byte("hasRole")): hasRole,
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LeftPadWord256([]byte("addRole")): addRole,
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LeftPadWord256([]byte("rmRole")): rmRole,
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}
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// Takes an appState so it can lookup/update accounts,
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// an account to check for permission to access the snative contract
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// and some input bytes (presumably 32byte words)
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type SNativeContract func(appState AppState, acc *Account, input []byte) (output []byte, err error)
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//-----------------------------------------------------------------------------
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// snative are native contracts that can access and manipulate the chain state
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// (in particular the permissions values)
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// TODO: catch errors, log em, return 0s to the vm (should some errors cause exceptions though?)
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func hasBasePerm(appState AppState, acc *Account, args []byte) (output []byte, err error) {
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if !HasPermission(appState, acc, ptypes.HasBasePerm) {
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return nil, ErrInvalidPermission{acc.Address, "HasBasePerm"}
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}
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if len(args) != 2*32 {
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return nil, fmt.Errorf("hasBasePerm() takes two arguments (address, permission number)")
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}
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addr, permNum := returnTwoArgs(args)
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vmAcc := appState.GetAccount(addr)
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if vmAcc == nil {
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return nil, fmt.Errorf("Unknown account %X", addr)
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}
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permN := ptypes.PermFlag(Uint64FromWord256(permNum)) // already shifted
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if !ValidPermN(permN) {
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return nil, ptypes.ErrInvalidPermission(permN)
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}
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var permInt byte
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if HasPermission(appState, vmAcc, permN) {
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permInt = 0x1
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} else {
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permInt = 0x0
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}
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dbg.Printf("snative.hasBasePerm(0x%X, %b) = %v\n", addr.Postfix(20), permN, permInt)
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return LeftPadWord256([]byte{permInt}).Bytes(), nil
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}
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func setBasePerm(appState AppState, acc *Account, args []byte) (output []byte, err error) {
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if !HasPermission(appState, acc, ptypes.SetBasePerm) {
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return nil, ErrInvalidPermission{acc.Address, "SetBasePerm"}
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}
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if len(args) != 3*32 {
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return nil, fmt.Errorf("setBasePerm() takes three arguments (address, permission number, permission value)")
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}
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addr, permNum, perm := returnThreeArgs(args)
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vmAcc := appState.GetAccount(addr)
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if vmAcc == nil {
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return nil, fmt.Errorf("Unknown account %X", addr)
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}
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permN := ptypes.PermFlag(Uint64FromWord256(permNum))
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if !ValidPermN(permN) {
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return nil, ptypes.ErrInvalidPermission(permN)
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}
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permV := !perm.IsZero()
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if err = vmAcc.Permissions.Base.Set(permN, permV); err != nil {
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return nil, err
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}
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appState.UpdateAccount(vmAcc)
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dbg.Printf("snative.setBasePerm(0x%X, %b, %v)\n", addr.Postfix(20), permN, permV)
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return perm.Bytes(), nil
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}
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func unsetBasePerm(appState AppState, acc *Account, args []byte) (output []byte, err error) {
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if !HasPermission(appState, acc, ptypes.UnsetBasePerm) {
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return nil, ErrInvalidPermission{acc.Address, "UnsetBasePerm"}
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}
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if len(args) != 2*32 {
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return nil, fmt.Errorf("unsetBasePerm() takes two arguments (address, permission number)")
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}
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addr, permNum := returnTwoArgs(args)
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vmAcc := appState.GetAccount(addr)
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if vmAcc == nil {
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return nil, fmt.Errorf("Unknown account %X", addr)
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}
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permN := ptypes.PermFlag(Uint64FromWord256(permNum))
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if !ValidPermN(permN) {
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return nil, ptypes.ErrInvalidPermission(permN)
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}
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if err = vmAcc.Permissions.Base.Unset(permN); err != nil {
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return nil, err
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}
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appState.UpdateAccount(vmAcc)
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dbg.Printf("snative.unsetBasePerm(0x%X, %b)\n", addr.Postfix(20), permN)
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return permNum.Bytes(), nil
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}
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func setGlobalPerm(appState AppState, acc *Account, args []byte) (output []byte, err error) {
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if !HasPermission(appState, acc, ptypes.SetGlobalPerm) {
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return nil, ErrInvalidPermission{acc.Address, "SetGlobalPerm"}
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}
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if len(args) != 2*32 {
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return nil, fmt.Errorf("setGlobalPerm() takes two arguments (permission number, permission value)")
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}
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permNum, perm := returnTwoArgs(args)
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vmAcc := appState.GetAccount(ptypes.GlobalPermissionsAddress256)
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if vmAcc == nil {
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panic("cant find the global permissions account")
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}
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permN := ptypes.PermFlag(Uint64FromWord256(permNum))
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if !ValidPermN(permN) {
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return nil, ptypes.ErrInvalidPermission(permN)
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}
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permV := !perm.IsZero()
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if err = vmAcc.Permissions.Base.Set(permN, permV); err != nil {
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return nil, err
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}
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appState.UpdateAccount(vmAcc)
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dbg.Printf("snative.setGlobalPerm(%b, %v)\n", permN, permV)
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return perm.Bytes(), nil
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}
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// TODO: needs access to an iterator ...
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func clearPerm(appState AppState, acc *Account, args []byte) (output []byte, err error) {
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if !HasPermission(appState, acc, ptypes.ClearBasePerm) {
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return nil, ErrInvalidPermission{acc.Address, "ClearPerm"}
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}
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return nil, nil
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}
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func hasRole(appState AppState, acc *Account, args []byte) (output []byte, err error) {
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if !HasPermission(appState, acc, ptypes.HasRole) {
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return nil, ErrInvalidPermission{acc.Address, "HasRole"}
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}
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if len(args) != 2*32 {
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return nil, fmt.Errorf("hasRole() takes two arguments (address, role)")
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}
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addr, role := returnTwoArgs(args)
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vmAcc := appState.GetAccount(addr)
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if vmAcc == nil {
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return nil, fmt.Errorf("Unknown account %X", addr)
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}
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roleS := string(role.Bytes())
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var permInt byte
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if vmAcc.Permissions.HasRole(roleS) {
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permInt = 0x1
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} else {
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permInt = 0x0
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}
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dbg.Printf("snative.hasRole(0x%X, %s) = %v\n", addr.Postfix(20), roleS, permInt > 0)
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return LeftPadWord256([]byte{permInt}).Bytes(), nil
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}
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func addRole(appState AppState, acc *Account, args []byte) (output []byte, err error) {
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if !HasPermission(appState, acc, ptypes.AddRole) {
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return nil, ErrInvalidPermission{acc.Address, "AddRole"}
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}
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if len(args) != 2*32 {
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return nil, fmt.Errorf("addRole() takes two arguments (address, role)")
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}
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addr, role := returnTwoArgs(args)
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vmAcc := appState.GetAccount(addr)
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if vmAcc == nil {
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return nil, fmt.Errorf("Unknown account %X", addr)
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}
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roleS := string(role.Bytes())
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var permInt byte
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if vmAcc.Permissions.AddRole(roleS) {
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permInt = 0x1
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} else {
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permInt = 0x0
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}
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appState.UpdateAccount(vmAcc)
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dbg.Printf("snative.addRole(0x%X, %s) = %v\n", addr.Postfix(20), roleS, permInt > 0)
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return LeftPadWord256([]byte{permInt}).Bytes(), nil
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}
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func rmRole(appState AppState, acc *Account, args []byte) (output []byte, err error) {
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if !HasPermission(appState, acc, ptypes.RmRole) {
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return nil, ErrInvalidPermission{acc.Address, "RmRole"}
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}
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if len(args) != 2*32 {
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return nil, fmt.Errorf("rmRole() takes two arguments (address, role)")
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}
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addr, role := returnTwoArgs(args)
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vmAcc := appState.GetAccount(addr)
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if vmAcc == nil {
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return nil, fmt.Errorf("Unknown account %X", addr)
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}
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roleS := string(role.Bytes())
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var permInt byte
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if vmAcc.Permissions.RmRole(roleS) {
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permInt = 0x1
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} else {
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permInt = 0x0
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}
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appState.UpdateAccount(vmAcc)
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dbg.Printf("snative.rmRole(0x%X, %s) = %v\n", addr.Postfix(20), roleS, permInt > 0)
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return LeftPadWord256([]byte{permInt}).Bytes(), nil
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}
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//------------------------------------------------------------------------------------------------
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// Errors and utility funcs
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type ErrInvalidPermission struct {
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Address Word256
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SNative string
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}
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func (e ErrInvalidPermission) Error() string {
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return fmt.Sprintf("Account %X does not have permission snative.%s", e.Address.Postfix(20), e.SNative)
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}
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// Checks if a permission flag is valid (a known base chain or snative permission)
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func ValidPermN(n ptypes.PermFlag) bool {
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if n > ptypes.TopBasePermFlag && n < ptypes.FirstSNativePermFlag {
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return false
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} else if n > ptypes.TopSNativePermFlag {
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return false
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}
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return true
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}
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// assumes length has already been checked
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func returnTwoArgs(args []byte) (a Word256, b Word256) {
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copy(a[:], args[:32])
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copy(b[:], args[32:64])
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return
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}
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// assumes length has already been checked
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func returnThreeArgs(args []byte) (a Word256, b Word256, c Word256) {
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copy(a[:], args[:32])
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copy(b[:], args[32:64])
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copy(c[:], args[64:96])
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return
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}
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// mostly a convenience for testing
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var RegisteredSNativePermissions = map[Word256]ptypes.PermFlag{
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LeftPadWord256([]byte("hasBasePerm")): ptypes.HasBasePerm,
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LeftPadWord256([]byte("setBasePerm")): ptypes.SetBasePerm,
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LeftPadWord256([]byte("unsetBasePerm")): ptypes.UnsetBasePerm,
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LeftPadWord256([]byte("setGlobalPerm")): ptypes.SetGlobalPerm,
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LeftPadWord256([]byte("hasRole")): ptypes.HasRole,
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LeftPadWord256([]byte("addRole")): ptypes.AddRole,
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LeftPadWord256([]byte("rmRole")): ptypes.RmRole,
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}
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