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// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package impl
import (
"fmt"
"math"
"math/bits"
"reflect"
"unicode/utf8"
"google.golang.org/protobuf/encoding/protowire"
"google.golang.org/protobuf/internal/encoding/messageset"
"google.golang.org/protobuf/internal/flags"
"google.golang.org/protobuf/internal/genid"
"google.golang.org/protobuf/internal/strs"
pref "google.golang.org/protobuf/reflect/protoreflect"
preg "google.golang.org/protobuf/reflect/protoregistry"
piface "google.golang.org/protobuf/runtime/protoiface"
)
// ValidationStatus is the result of validating the wire-format encoding of a message.
type ValidationStatus int
const (
// ValidationUnknown indicates that unmarshaling the message might succeed or fail.
// The validator was unable to render a judgement.
//
// The only causes of this status are an aberrant message type appearing somewhere
// in the message or a failure in the extension resolver.
ValidationUnknown ValidationStatus = iota + 1
// ValidationInvalid indicates that unmarshaling the message will fail.
ValidationInvalid
// ValidationValid indicates that unmarshaling the message will succeed.
ValidationValid
)
func (v ValidationStatus) String() string {
switch v {
case ValidationUnknown:
return "ValidationUnknown"
case ValidationInvalid:
return "ValidationInvalid"
case ValidationValid:
return "ValidationValid"
default:
return fmt.Sprintf("ValidationStatus(%d)", int(v))
}
}
// Validate determines whether the contents of the buffer are a valid wire encoding
// of the message type.
//
// This function is exposed for testing.
func Validate(mt pref.MessageType, in piface.UnmarshalInput) (out piface.UnmarshalOutput, _ ValidationStatus) {
mi, ok := mt.(*MessageInfo)
if !ok {
return out, ValidationUnknown
}
if in.Resolver == nil {
in.Resolver = preg.GlobalTypes
}
o, st := mi.validate(in.Buf, 0, unmarshalOptions{
flags: in.Flags,
resolver: in.Resolver,
})
if o.initialized {
out.Flags |= piface.UnmarshalInitialized
}
return out, st
}
type validationInfo struct {
mi *MessageInfo
typ validationType
keyType, valType validationType
// For non-required fields, requiredBit is 0.
//
// For required fields, requiredBit's nth bit is set, where n is a
// unique index in the range [0, MessageInfo.numRequiredFields).
//
// If there are more than 64 required fields, requiredBit is 0.
requiredBit uint64
}
type validationType uint8
const (
validationTypeOther validationType = iota
validationTypeMessage
validationTypeGroup
validationTypeMap
validationTypeRepeatedVarint
validationTypeRepeatedFixed32
validationTypeRepeatedFixed64
validationTypeVarint
validationTypeFixed32
validationTypeFixed64
validationTypeBytes
validationTypeUTF8String
validationTypeMessageSetItem
)
func newFieldValidationInfo(mi *MessageInfo, si structInfo, fd pref.FieldDescriptor, ft reflect.Type) validationInfo {
var vi validationInfo
switch {
case fd.ContainingOneof() != nil && !fd.ContainingOneof().IsSynthetic():
switch fd.Kind() {
case pref.MessageKind:
vi.typ = validationTypeMessage
if ot, ok := si.oneofWrappersByNumber[fd.Number()]; ok {
vi.mi = getMessageInfo(ot.Field(0).Type)
}
case pref.GroupKind:
vi.typ = validationTypeGroup
if ot, ok := si.oneofWrappersByNumber[fd.Number()]; ok {
vi.mi = getMessageInfo(ot.Field(0).Type)
}
case pref.StringKind:
if strs.EnforceUTF8(fd) {
vi.typ = validationTypeUTF8String
}
}
default:
vi = newValidationInfo(fd, ft)
}
if fd.Cardinality() == pref.Required {
// Avoid overflow. The required field check is done with a 64-bit mask, with
// any message containing more than 64 required fields always reported as
// potentially uninitialized, so it is not important to get a precise count
// of the required fields past 64.
if mi.numRequiredFields < math.MaxUint8 {
mi.numRequiredFields++
vi.requiredBit = 1 << (mi.numRequiredFields - 1)
}
}
return vi
}
func newValidationInfo(fd pref.FieldDescriptor, ft reflect.Type) validationInfo {
var vi validationInfo
switch {
case fd.IsList():
switch fd.Kind() {
case pref.MessageKind:
vi.typ = validationTypeMessage
if ft.Kind() == reflect.Slice {
vi.mi = getMessageInfo(ft.Elem())
}
case pref.GroupKind:
vi.typ = validationTypeGroup
if ft.Kind() == reflect.Slice {
vi.mi = getMessageInfo(ft.Elem())
}
case pref.StringKind:
vi.typ = validationTypeBytes
if strs.EnforceUTF8(fd) {
vi.typ = validationTypeUTF8String
}
default:
switch wireTypes[fd.Kind()] {
case protowire.VarintType:
vi.typ = validationTypeRepeatedVarint
case protowire.Fixed32Type:
vi.typ = validationTypeRepeatedFixed32
case protowire.Fixed64Type:
vi.typ = validationTypeRepeatedFixed64
}
}
case fd.IsMap():
vi.typ = validationTypeMap
switch fd.MapKey().Kind() {
case pref.StringKind:
if strs.EnforceUTF8(fd) {
vi.keyType = validationTypeUTF8String
}
}
switch fd.MapValue().Kind() {
case pref.MessageKind:
vi.valType = validationTypeMessage
if ft.Kind() == reflect.Map {
vi.mi = getMessageInfo(ft.Elem())
}
case pref.StringKind:
if strs.EnforceUTF8(fd) {
vi.valType = validationTypeUTF8String
}
}
default:
switch fd.Kind() {
case pref.MessageKind:
vi.typ = validationTypeMessage
if !fd.IsWeak() {
vi.mi = getMessageInfo(ft)
}
case pref.GroupKind:
vi.typ = validationTypeGroup
vi.mi = getMessageInfo(ft)
case pref.StringKind:
vi.typ = validationTypeBytes
if strs.EnforceUTF8(fd) {
vi.typ = validationTypeUTF8String
}
default:
switch wireTypes[fd.Kind()] {
case protowire.VarintType:
vi.typ = validationTypeVarint
case protowire.Fixed32Type:
vi.typ = validationTypeFixed32
case protowire.Fixed64Type:
vi.typ = validationTypeFixed64
case protowire.BytesType:
vi.typ = validationTypeBytes
}
}
}
return vi
}
func (mi *MessageInfo) validate(b []byte, groupTag protowire.Number, opts unmarshalOptions) (out unmarshalOutput, result ValidationStatus) {
mi.init()
type validationState struct {
typ validationType
keyType, valType validationType
endGroup protowire.Number
mi *MessageInfo
tail []byte
requiredMask uint64
}
// Pre-allocate some slots to avoid repeated slice reallocation.
states := make([]validationState, 0, 16)
states = append(states, validationState{
typ: validationTypeMessage,
mi: mi,
})
if groupTag > 0 {
states[0].typ = validationTypeGroup
states[0].endGroup = groupTag
}
initialized := true
start := len(b)
State:
for len(states) > 0 {
st := &states[len(states)-1]
for len(b) > 0 {
// Parse the tag (field number and wire type).
var tag uint64
if b[0] < 0x80 {
tag = uint64(b[0])
b = b[1:]
} else if len(b) >= 2 && b[1] < 128 {
tag = uint64(b[0]&0x7f) + uint64(b[1])<<7
b = b[2:]
} else {
var n int
tag, n = protowire.ConsumeVarint(b)
if n < 0 {
return out, ValidationInvalid
}
b = b[n:]
}
var num protowire.Number
if n := tag >> 3; n < uint64(protowire.MinValidNumber) || n > uint64(protowire.MaxValidNumber) {
return out, ValidationInvalid
} else {
num = protowire.Number(n)
}
wtyp := protowire.Type(tag & 7)
if wtyp == protowire.EndGroupType {
if st.endGroup == num {
goto PopState
}
return out, ValidationInvalid
}
var vi validationInfo
switch {
case st.typ == validationTypeMap:
switch num {
case genid.MapEntry_Key_field_number:
vi.typ = st.keyType
case genid.MapEntry_Value_field_number:
vi.typ = st.valType
vi.mi = st.mi
vi.requiredBit = 1
}
case flags.ProtoLegacy && st.mi.isMessageSet:
switch num {
case messageset.FieldItem:
vi.typ = validationTypeMessageSetItem
}
default:
var f *coderFieldInfo
if int(num) < len(st.mi.denseCoderFields) {
f = st.mi.denseCoderFields[num]
} else {
f = st.mi.coderFields[num]
}
if f != nil {
vi = f.validation
if vi.typ == validationTypeMessage && vi.mi == nil {
// Probable weak field.
//
// TODO: Consider storing the results of this lookup somewhere
// rather than recomputing it on every validation.
fd := st.mi.Desc.Fields().ByNumber(num)
if fd == nil || !fd.IsWeak() {
break
}
messageName := fd.Message().FullName()
messageType, err := preg.GlobalTypes.FindMessageByName(messageName)
switch err {
case nil:
vi.mi, _ = messageType.(*MessageInfo)
case preg.NotFound:
vi.typ = validationTypeBytes
default:
return out, ValidationUnknown
}
}
break
}
// Possible extension field.
//
// TODO: We should return ValidationUnknown when:
// 1. The resolver is not frozen. (More extensions may be added to it.)
// 2. The resolver returns preg.NotFound.
// In this case, a type added to the resolver in the future could cause
// unmarshaling to begin failing. Supporting this requires some way to
// determine if the resolver is frozen.
xt, err := opts.resolver.FindExtensionByNumber(st.mi.Desc.FullName(), num)
if err != nil && err != preg.NotFound {
return out, ValidationUnknown
}
if err == nil {
vi = getExtensionFieldInfo(xt).validation
}
}
if vi.requiredBit != 0 {
// Check that the field has a compatible wire type.
// We only need to consider non-repeated field types,
// since repeated fields (and maps) can never be required.
ok := false
switch vi.typ {
case validationTypeVarint:
ok = wtyp == protowire.VarintType
case validationTypeFixed32:
ok = wtyp == protowire.Fixed32Type
case validationTypeFixed64:
ok = wtyp == protowire.Fixed64Type
case validationTypeBytes, validationTypeUTF8String, validationTypeMessage:
ok = wtyp == protowire.BytesType
case validationTypeGroup:
ok = wtyp == protowire.StartGroupType
}
if ok {
st.requiredMask |= vi.requiredBit
}
}
switch wtyp {
case protowire.VarintType:
if len(b) >= 10 {
switch {
case b[0] < 0x80:
b = b[1:]
case b[1] < 0x80:
b = b[2:]
case b[2] < 0x80:
b = b[3:]
case b[3] < 0x80:
b = b[4:]
case b[4] < 0x80:
b = b[5:]
case b[5] < 0x80:
b = b[6:]
case b[6] < 0x80:
b = b[7:]
case b[7] < 0x80:
b = b[8:]
case b[8] < 0x80:
b = b[9:]
case b[9] < 0x80 && b[9] < 2:
b = b[10:]
default:
return out, ValidationInvalid
}
} else {
switch {
case len(b) > 0 && b[0] < 0x80:
b = b[1:]
case len(b) > 1 && b[1] < 0x80:
b = b[2:]
case len(b) > 2 && b[2] < 0x80:
b = b[3:]
case len(b) > 3 && b[3] < 0x80:
b = b[4:]
case len(b) > 4 && b[4] < 0x80:
b = b[5:]
case len(b) > 5 && b[5] < 0x80:
b = b[6:]
case len(b) > 6 && b[6] < 0x80:
b = b[7:]
case len(b) > 7 && b[7] < 0x80:
b = b[8:]
case len(b) > 8 && b[8] < 0x80:
b = b[9:]
case len(b) > 9 && b[9] < 2:
b = b[10:]
default:
return out, ValidationInvalid
}
}
continue State
case protowire.BytesType:
var size uint64
if len(b) >= 1 && b[0] < 0x80 {
size = uint64(b[0])
b = b[1:]
} else if len(b) >= 2 && b[1] < 128 {
size = uint64(b[0]&0x7f) + uint64(b[1])<<7
b = b[2:]
} else {
var n int
size, n = protowire.ConsumeVarint(b)
if n < 0 {
return out, ValidationInvalid
}
b = b[n:]
}
if size > uint64(len(b)) {
return out, ValidationInvalid
}
v := b[:size]
b = b[size:]
switch vi.typ {
case validationTypeMessage:
if vi.mi == nil {
return out, ValidationUnknown
}
vi.mi.init()
fallthrough
case validationTypeMap:
if vi.mi != nil {
vi.mi.init()
}
states = append(states, validationState{
typ: vi.typ,
keyType: vi.keyType,
valType: vi.valType,
mi: vi.mi,
tail: b,
})
b = v
continue State
case validationTypeRepeatedVarint:
// Packed field.
for len(v) > 0 {
_, n := protowire.ConsumeVarint(v)
if n < 0 {
return out, ValidationInvalid
}
v = v[n:]
}
case validationTypeRepeatedFixed32:
// Packed field.
if len(v)%4 != 0 {
return out, ValidationInvalid
}
case validationTypeRepeatedFixed64:
// Packed field.
if len(v)%8 != 0 {
return out, ValidationInvalid
}
case validationTypeUTF8String:
if !utf8.Valid(v) {
return out, ValidationInvalid
}
}
case protowire.Fixed32Type:
if len(b) < 4 {
return out, ValidationInvalid
}
b = b[4:]
case protowire.Fixed64Type:
if len(b) < 8 {
return out, ValidationInvalid
}
b = b[8:]
case protowire.StartGroupType:
switch {
case vi.typ == validationTypeGroup:
if vi.mi == nil {
return out, ValidationUnknown
}
vi.mi.init()
states = append(states, validationState{
typ: validationTypeGroup,
mi: vi.mi,
endGroup: num,
})
continue State
case flags.ProtoLegacy && vi.typ == validationTypeMessageSetItem:
typeid, v, n, err := messageset.ConsumeFieldValue(b, false)
if err != nil {
return out, ValidationInvalid
}
xt, err := opts.resolver.FindExtensionByNumber(st.mi.Desc.FullName(), typeid)
switch {
case err == preg.NotFound:
b = b[n:]
case err != nil:
return out, ValidationUnknown
default:
xvi := getExtensionFieldInfo(xt).validation
if xvi.mi != nil {
xvi.mi.init()
}
states = append(states, validationState{
typ: xvi.typ,
mi: xvi.mi,
tail: b[n:],
})
b = v
continue State
}
default:
n := protowire.ConsumeFieldValue(num, wtyp, b)
if n < 0 {
return out, ValidationInvalid
}
b = b[n:]
}
default:
return out, ValidationInvalid
}
}
if st.endGroup != 0 {
return out, ValidationInvalid
}
if len(b) != 0 {
return out, ValidationInvalid
}
b = st.tail
PopState:
numRequiredFields := 0
switch st.typ {
case validationTypeMessage, validationTypeGroup:
numRequiredFields = int(st.mi.numRequiredFields)
case validationTypeMap:
// If this is a map field with a message value that contains
// required fields, require that the value be present.
if st.mi != nil && st.mi.numRequiredFields > 0 {
numRequiredFields = 1
}
}
// If there are more than 64 required fields, this check will
// always fail and we will report that the message is potentially
// uninitialized.
if numRequiredFields > 0 && bits.OnesCount64(st.requiredMask) != numRequiredFields {
initialized = false
}
states = states[:len(states)-1]
}
out.n = start - len(b)
if initialized {
out.initialized = true
}
return out, ValidationValid
}
