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asn1: Fixes and additions to marshalling

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Marshalling:
* Fixes several silly bugs.
* Support the RawContents type.
* Support the RawValue type.
* Recurse into nested interface{}.

Both directions:
* Better handling of SETs. You can now tag an element in a
  structure with "set" to get the correct tag for serialisation.
* For types that aren't in a structure, you can now name them
  with "SET" on the end.
* SETs are no longer implicitly treated as SEQUENCEs.

R=rsc
CC=golang-dev
https://golang.org/cl/201049
This commit is contained in:
Adam Langley 2010-02-05 05:42:02 -05:00
parent 5d827fac39
commit 95e08bde44
6 changed files with 161 additions and 47 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
src/pkg/asn1/asn1.go
View File

@ -410,11 +410,6 @@ func parseTagAndLength(bytes []byte, initOffset int) (ret tagAndLength, offset i
}
}
// We magically map SET and SET OF to SEQUENCE and SEQUENCE OF
// because we treat everything as ordered.
if ret.tag == tagSet {
ret.tag = tagSequence
}
return
}

49
src/pkg/asn1/asn1_test.go
View File

@ -224,16 +224,17 @@ func newString(s string) *string { return &s }
func newBool(b bool) *bool { return &b }
var parseFieldParametersTestData []parseFieldParametersTest = []parseFieldParametersTest{
parseFieldParametersTest{"", fieldParameters{false, false, nil, nil, 0}},
parseFieldParametersTest{"ia5", fieldParameters{false, false, nil, nil, tagIA5String}},
parseFieldParametersTest{"printable", fieldParameters{false, false, nil, nil, tagPrintableString}},
parseFieldParametersTest{"optional", fieldParameters{true, false, nil, nil, 0}},
parseFieldParametersTest{"explicit", fieldParameters{false, true, nil, new(int), 0}},
parseFieldParametersTest{"optional,explicit", fieldParameters{true, true, nil, new(int), 0}},
parseFieldParametersTest{"default:42", fieldParameters{false, false, newInt64(42), nil, 0}},
parseFieldParametersTest{"tag:17", fieldParameters{false, false, nil, newInt(17), 0}},
parseFieldParametersTest{"optional,explicit,default:42,tag:17", fieldParameters{true, true, newInt64(42), newInt(17), 0}},
parseFieldParametersTest{"optional,explicit,default:42,tag:17,rubbish1", fieldParameters{true, true, newInt64(42), newInt(17), 0}},
parseFieldParametersTest{"", fieldParameters{}},
parseFieldParametersTest{"ia5", fieldParameters{stringType: tagIA5String}},
parseFieldParametersTest{"printable", fieldParameters{stringType: tagPrintableString}},
parseFieldParametersTest{"optional", fieldParameters{optional: true}},
parseFieldParametersTest{"explicit", fieldParameters{explicit: true, tag: new(int)}},
parseFieldParametersTest{"optional,explicit", fieldParameters{optional: true, explicit: true, tag: new(int)}},
parseFieldParametersTest{"default:42", fieldParameters{defaultValue: newInt64(42)}},
parseFieldParametersTest{"tag:17", fieldParameters{tag: newInt(17)}},
parseFieldParametersTest{"optional,explicit,default:42,tag:17", fieldParameters{optional: true, explicit: true, defaultValue: newInt64(42), tag: newInt(17)}},
parseFieldParametersTest{"optional,explicit,default:42,tag:17,rubbish1", fieldParameters{true, true, newInt64(42), newInt(17), 0, false}},
parseFieldParametersTest{"set", fieldParameters{set: true}},
}
func TestParseFieldParameters(t *testing.T) {
@ -321,9 +322,9 @@ type AlgorithmIdentifier struct {
Algorithm ObjectIdentifier
}
type RDNSequence []RelativeDistinguishedName
type RDNSequence []RelativeDistinguishedNameSET
type RelativeDistinguishedName []AttributeTypeAndValue
type RelativeDistinguishedNameSET []AttributeTypeAndValue
type AttributeTypeAndValue struct {
Type ObjectIdentifier
@ -392,21 +393,21 @@ var derEncodedSelfSignedCert = Certificate{
SerialNumber: RawValue{Class: 0, Tag: 2, IsCompound: false, Bytes: []uint8{0x0, 0x8c, 0xc3, 0x37, 0x92, 0x10, 0xec, 0x2c, 0x98}},
SignatureAlgorithm: AlgorithmIdentifier{Algorithm: ObjectIdentifier{1, 2, 840, 113549, 1, 1, 5}},
Issuer: RDNSequence{
RelativeDistinguishedName{AttributeTypeAndValue{Type: ObjectIdentifier{2, 5, 4, 6}, Value: "XX"}},
RelativeDistinguishedName{AttributeTypeAndValue{Type: ObjectIdentifier{2, 5, 4, 8}, Value: "Some-State"}},
RelativeDistinguishedName{AttributeTypeAndValue{Type: ObjectIdentifier{2, 5, 4, 7}, Value: "City"}},
RelativeDistinguishedName{AttributeTypeAndValue{Type: ObjectIdentifier{2, 5, 4, 10}, Value: "Internet Widgits Pty Ltd"}},
RelativeDistinguishedName{AttributeTypeAndValue{Type: ObjectIdentifier{2, 5, 4, 3}, Value: "false.example.com"}},
RelativeDistinguishedName{AttributeTypeAndValue{Type: ObjectIdentifier{1, 2, 840, 113549, 1, 9, 1}, Value: "false@example.com"}},
RelativeDistinguishedNameSET{AttributeTypeAndValue{Type: ObjectIdentifier{2, 5, 4, 6}, Value: "XX"}},
RelativeDistinguishedNameSET{AttributeTypeAndValue{Type: ObjectIdentifier{2, 5, 4, 8}, Value: "Some-State"}},
RelativeDistinguishedNameSET{AttributeTypeAndValue{Type: ObjectIdentifier{2, 5, 4, 7}, Value: "City"}},
RelativeDistinguishedNameSET{AttributeTypeAndValue{Type: ObjectIdentifier{2, 5, 4, 10}, Value: "Internet Widgits Pty Ltd"}},
RelativeDistinguishedNameSET{AttributeTypeAndValue{Type: ObjectIdentifier{2, 5, 4, 3}, Value: "false.example.com"}},
RelativeDistinguishedNameSET{AttributeTypeAndValue{Type: ObjectIdentifier{1, 2, 840, 113549, 1, 9, 1}, Value: "false@example.com"}},
},
Validity: Validity{NotBefore: &time.Time{Year: 2009, Month: 10, Day: 8, Hour: 0, Minute: 25, Second: 53, Weekday: 0, ZoneOffset: 0, Zone: ""}, NotAfter: &time.Time{Year: 2010, Month: 10, Day: 8, Hour: 0, Minute: 25, Second: 53, Weekday: 0, ZoneOffset: 0, Zone: ""}},
Subject: RDNSequence{
RelativeDistinguishedName{AttributeTypeAndValue{Type: ObjectIdentifier{2, 5, 4, 6}, Value: "XX"}},
RelativeDistinguishedName{AttributeTypeAndValue{Type: ObjectIdentifier{2, 5, 4, 8}, Value: "Some-State"}},
RelativeDistinguishedName{AttributeTypeAndValue{Type: ObjectIdentifier{2, 5, 4, 7}, Value: "City"}},
RelativeDistinguishedName{AttributeTypeAndValue{Type: ObjectIdentifier{2, 5, 4, 10}, Value: "Internet Widgits Pty Ltd"}},
RelativeDistinguishedName{AttributeTypeAndValue{Type: ObjectIdentifier{2, 5, 4, 3}, Value: "false.example.com"}},
RelativeDistinguishedName{AttributeTypeAndValue{Type: ObjectIdentifier{1, 2, 840, 113549, 1, 9, 1}, Value: "false@example.com"}},
RelativeDistinguishedNameSET{AttributeTypeAndValue{Type: ObjectIdentifier{2, 5, 4, 6}, Value: "XX"}},
RelativeDistinguishedNameSET{AttributeTypeAndValue{Type: ObjectIdentifier{2, 5, 4, 8}, Value: "Some-State"}},
RelativeDistinguishedNameSET{AttributeTypeAndValue{Type: ObjectIdentifier{2, 5, 4, 7}, Value: "City"}},
RelativeDistinguishedNameSET{AttributeTypeAndValue{Type: ObjectIdentifier{2, 5, 4, 10}, Value: "Internet Widgits Pty Ltd"}},
RelativeDistinguishedNameSET{AttributeTypeAndValue{Type: ObjectIdentifier{2, 5, 4, 3}, Value: "false.example.com"}},
RelativeDistinguishedNameSET{AttributeTypeAndValue{Type: ObjectIdentifier{1, 2, 840, 113549, 1, 9, 1}, Value: "false@example.com"}},
},
PublicKey: PublicKeyInfo{
Algorithm: AlgorithmIdentifier{Algorithm: ObjectIdentifier{1, 2, 840, 113549, 1, 1, 1}},

6
src/pkg/asn1/common.go
View File

@ -68,6 +68,7 @@ type fieldParameters struct {
defaultValue *int64 // a default value for INTEGER typed fields (maybe nil).
tag *int // the EXPLICIT or IMPLICIT tag (maybe nil).
stringType int // the string tag to use when marshaling.
set bool // true iff this should be encoded as a SET
// Invariants:
// if explicit is set, tag is non-nil.
@ -103,6 +104,8 @@ func parseFieldParameters(str string) (ret fieldParameters) {
ret.tag = new(int)
*ret.tag = i
}
case part == "set":
ret.set = true
}
}
return
@ -132,6 +135,9 @@ func getUniversalType(t reflect.Type) (tagNumber int, isCompound, ok bool) {
if _, ok := t.(*reflect.SliceType).Elem().(*reflect.Uint8Type); ok {
return tagOctetString, false, true
}
if strings.HasSuffix(t.Name(), "SET") {
return tagSet, true, true
}
return tagSequence, true, true
case *reflect.StringType:
return tagPrintableString, false, true

126
src/pkg/asn1/marshal.go
View File

@ -71,23 +71,27 @@ func (f *forkableWriter) writeTo(out io.Writer) (n int, err os.Error) {
return
}
func marshalBase128Int(out *forkableWriter, i int64) (err os.Error) {
if i == 0 {
func marshalBase128Int(out *forkableWriter, n int64) (err os.Error) {
if n == 0 {
err = out.WriteByte(0)
return
}
for i > 0 {
next := i >> 7
o := byte(i & 0x7f)
if next > 0 {
l := 0
for i := n; i > 0; i >>= 7 {
l++
}
for i := l - 1; i >= 0; i-- {
o := byte(n >> uint(i*7))
o &= 0x7f
if i != 0 {
o |= 0x80
}
err = out.WriteByte(o)
if err != nil {
return
}
i = next
}
return nil
@ -106,6 +110,32 @@ func base128Length(i int) (numBytes int) {
return
}
func marshalInt64(out *forkableWriter, i int64) (err os.Error) {
n := int64Length(i)
for ; n > 0; n-- {
err = out.WriteByte(byte(i >> uint((n-1)*8)))
if err != nil {
return
}
}
return nil
}
func int64Length(i int64) (numBytes int) {
if i == 0 {
return 1
}
for i > 0 {
numBytes++
i >>= 8
}
return
}
func marshalTagAndLength(out *forkableWriter, t tagAndLength) (err os.Error) {
b := uint8(t.class) << 6
if t.isCompound {
@ -130,11 +160,12 @@ func marshalTagAndLength(out *forkableWriter, t tagAndLength) (err os.Error) {
}
if t.length >= 128 {
err = out.WriteByte(byte(base128Length(t.length)))
l := int64Length(int64(t.length))
err = out.WriteByte(0x80 | byte(l))
if err != nil {
return
}
err = marshalBase128Int(out, int64(t.length))
err = marshalInt64(out, int64(t.length))
if err != nil {
return
}
@ -276,6 +307,14 @@ func marshalUTCTime(out *forkableWriter, t *time.Time) (err os.Error) {
return
}
func stripTagAndLength(in []byte) []byte {
_, offset, err := parseTagAndLength(in, 0)
if err != nil {
return in
}
return in[offset:]
}
func marshalBody(out *forkableWriter, value reflect.Value, params fieldParameters) (err os.Error) {
switch value.Type() {
case timeType:
@ -294,12 +333,35 @@ func marshalBody(out *forkableWriter, value reflect.Value, params fieldParameter
return out.WriteByte(0)
}
case *reflect.IntValue:
return marshalBase128Int(out, int64(v.Get()))
return marshalInt64(out, int64(v.Get()))
case *reflect.Int64Value:
return marshalBase128Int(out, v.Get())
return marshalInt64(out, v.Get())
case *reflect.StructValue:
t := v.Type().(*reflect.StructType)
for i := 0; i < t.NumField(); i++ {
startingField := 0
// If the first element of the structure is a non-empty
// RawContents, then we don't bother serialising the rest.
if t.NumField() > 0 && t.Field(0).Type == rawContentsType {
s := v.Field(0).(*reflect.SliceValue)
if s.Len() > 0 {
bytes := make([]byte, s.Len())
for i := 0; i < s.Len(); i++ {
bytes[i] = s.Elem(i).(*reflect.Uint8Value).Get()
}
/* The RawContents will contain the tag and
* length fields but we'll also be writing
* those outselves, so we strip them out of
* bytes */
_, err = out.Write(stripTagAndLength(bytes))
return
} else {
startingField = 1
}
}
for i := startingField; i < t.NumField(); i++ {
var pre *forkableWriter
pre, out = out.fork()
err = marshalField(pre, v.Field(i), parseFieldParameters(t.Field(i).Tag))
@ -321,7 +383,9 @@ func marshalBody(out *forkableWriter, value reflect.Value, params fieldParameter
var params fieldParameters
for i := 0; i < v.Len(); i++ {
err = marshalField(out, v.Elem(i), params)
var pre *forkableWriter
pre, out = out.fork()
err = marshalField(pre, v.Elem(i), params)
if err != nil {
return
}
@ -340,6 +404,25 @@ func marshalBody(out *forkableWriter, value reflect.Value, params fieldParameter
}
func marshalField(out *forkableWriter, v reflect.Value, params fieldParameters) (err os.Error) {
// If the field is an interface{} then recurse into it.
if v, ok := v.(*reflect.InterfaceValue); ok && v.Type().(*reflect.InterfaceType).NumMethod() == 0 {
return marshalField(out, v.Elem(), params)
}
if v.Type() == rawValueType {
rv := v.Interface().(RawValue)
err = marshalTagAndLength(out, tagAndLength{rv.Class, rv.Tag, len(rv.Bytes), rv.IsCompound})
if err != nil {
return
}
_, err = out.Write(rv.Bytes)
return
}
if params.optional && reflect.DeepEqual(v.Interface(), reflect.MakeZero(v.Type()).Interface()) {
return
}
tag, isCompound, ok := getUniversalType(v.Type())
if !ok {
err = StructuralError{fmt.Sprintf("unknown Go type: %v", v.Type())}
@ -354,6 +437,13 @@ func marshalField(out *forkableWriter, v reflect.Value, params fieldParameters)
tag = params.stringType
}
if params.set {
if tag != tagSequence {
return StructuralError{"Non sequence tagged as set"}
}
tag = tagSet
}
tags, body := out.fork()
err = marshalBody(body, v, params)
@ -403,3 +493,13 @@ func Marshal(out io.Writer, val interface{}) os.Error {
_, err = f.writeTo(out)
return err
}
// MarshalToMemory performs the same actions as Marshal, but returns the result
// as a byte slice.
func MarshalToMemory(val interface{}) ([]byte, os.Error) {
var out bytes.Buffer
if err := Marshal(&out, val); err != nil {
return nil, err
}
return out.Bytes(), nil
}

18
src/pkg/asn1/marshal_test.go
View File

@ -24,9 +24,9 @@ type nestedStruct struct {
A intStruct
}
type marshalTest struct {
in interface{}
out string // hex encoded
type rawContentsStruct struct {
Raw RawContent
A int
}
type implicitTagTest struct {
@ -45,11 +45,18 @@ type printableStringTest struct {
A string "printable"
}
type testSET []int
func setPST(t *time.Time) *time.Time {
t.ZoneOffset = -28800
return t
}
type marshalTest struct {
in interface{}
out string // hex encoded
}
var marshalTests = []marshalTest{
marshalTest{10, "02010a"},
marshalTest{intStruct{64}, "3003020140"},
@ -64,9 +71,14 @@ var marshalTests = []marshalTest{
marshalTest{BitString{[]byte{0x80}, 1}, "03020780"},
marshalTest{BitString{[]byte{0x81, 0xf0}, 12}, "03030481f0"},
marshalTest{ObjectIdentifier([]int{1, 2, 3, 4}), "06032a0304"},
marshalTest{ObjectIdentifier([]int{1, 2, 840, 133549, 1, 1, 5}), "06092a864888932d010105"},
marshalTest{"test", "130474657374"},
marshalTest{ia5StringTest{"test"}, "3006160474657374"},
marshalTest{printableStringTest{"test"}, "3006130474657374"},
marshalTest{rawContentsStruct{nil, 64}, "3003020140"},
marshalTest{rawContentsStruct{[]byte{0x30, 3, 1, 2, 3}, 64}, "3003010203"},
marshalTest{RawValue{Tag: 1, Class: 2, IsCompound: false, Bytes: []byte{1, 2, 3}}, "8103010203"},
marshalTest{testSET([]int{10}), "310302010a"},
}
func TestMarshal(t *testing.T) {

4
src/pkg/crypto/x509/x509.go
View File

@ -95,9 +95,9 @@ type algorithmIdentifier struct {
Algorithm asn1.ObjectIdentifier
}
type rdnSequence []relativeDistinguishedName
type rdnSequence []relativeDistinguishedNameSET
type relativeDistinguishedName []attributeTypeAndValue
type relativeDistinguishedNameSET []attributeTypeAndValue
type attributeTypeAndValue struct {
Type asn1.ObjectIdentifier