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rlp: fix check for canonical byte array size 

Decoding did not reject byte arrays of length one with a single element
b where 55 < b < 128. Such byte arrays must be rejected because
they must be encoded as the single byte b instead.
This commit is contained in:
Felix Lange 2015-07-18 16:13:20 +02:00
parent cefd948267
commit 345590f27f
2 changed files with 16 additions and 9 deletions
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6
rlp/decode.go
View File

@ -361,7 +361,7 @@ func decodeByteArray(s *Stream, val reflect.Value) error {
return err return err
} }
// Reject cases where single byte encoding should have been used. // Reject cases where single byte encoding should have been used.
if size == 1 && slice[0] < 56 { if size == 1 && slice[0] < 128 {
return wrapStreamError(ErrCanonSize, val.Type()) return wrapStreamError(ErrCanonSize, val.Type())
} }
case List: case List:
@ -623,7 +623,7 @@ func (s *Stream) Bytes() ([]byte, error) {
if err = s.readFull(b); err != nil { if err = s.readFull(b); err != nil {
return nil, err return nil, err
} }
if size == 1 && b[0] < 56 { if size == 1 && b[0] < 128 {
return nil, ErrCanonSize return nil, ErrCanonSize
} }
return b, nil return b, nil
@ -687,7 +687,7 @@ func (s *Stream) uint(maxbits int) (uint64, error) {
return 0, ErrCanonInt return 0, ErrCanonInt
case err != nil: case err != nil:
return 0, err return 0, err
case size > 0 && v < 56: case size > 0 && v < 128:
return 0, ErrCanonSize return 0, ErrCanonSize
default: default:
return v, nil return v, nil

19
rlp/decode_test.go
View File

@ -113,12 +113,16 @@ func TestStreamErrors(t *testing.T) {
{"00", calls{"Uint"}, nil, ErrCanonInt}, {"00", calls{"Uint"}, nil, ErrCanonInt},
{"820002", calls{"Uint"}, nil, ErrCanonInt}, {"820002", calls{"Uint"}, nil, ErrCanonInt},
{"8133", calls{"Uint"}, nil, ErrCanonSize}, {"8133", calls{"Uint"}, nil, ErrCanonSize},
{"8156", calls{"Uint"}, nil, nil}, {"817F", calls{"Uint"}, nil, ErrCanonSize},
{"8180", calls{"Uint"}, nil, nil},
// Size tags must use the smallest possible encoding. // Size tags must use the smallest possible encoding.
// Leading zero bytes in the size tag are also rejected. // Leading zero bytes in the size tag are also rejected.
{"8100", calls{"Uint"}, nil, ErrCanonSize}, {"8100", calls{"Uint"}, nil, ErrCanonSize},
{"8100", calls{"Bytes"}, nil, ErrCanonSize}, {"8100", calls{"Bytes"}, nil, ErrCanonSize},
{"8101", calls{"Bytes"}, nil, ErrCanonSize},
{"817F", calls{"Bytes"}, nil, ErrCanonSize},
{"8180", calls{"Bytes"}, nil, nil},
{"B800", calls{"Kind"}, withoutInputLimit, ErrCanonSize}, {"B800", calls{"Kind"}, withoutInputLimit, ErrCanonSize},
{"B90000", calls{"Kind"}, withoutInputLimit, ErrCanonSize}, {"B90000", calls{"Kind"}, withoutInputLimit, ErrCanonSize},
{"B90055", calls{"Kind"}, withoutInputLimit, ErrCanonSize}, {"B90055", calls{"Kind"}, withoutInputLimit, ErrCanonSize},
@ -132,11 +136,11 @@ func TestStreamErrors(t *testing.T) {
{"", calls{"Kind"}, nil, io.EOF}, {"", calls{"Kind"}, nil, io.EOF},
{"", calls{"Uint"}, nil, io.EOF}, {"", calls{"Uint"}, nil, io.EOF},
{"", calls{"List"}, nil, io.EOF}, {"", calls{"List"}, nil, io.EOF},
{"8158", calls{"Uint", "Uint"}, nil, io.EOF}, {"8180", calls{"Uint", "Uint"}, nil, io.EOF},
{"C0", calls{"List", "ListEnd", "List"}, nil, io.EOF}, {"C0", calls{"List", "ListEnd", "List"}, nil, io.EOF},
{"", calls{"List"}, withoutInputLimit, io.EOF}, {"", calls{"List"}, withoutInputLimit, io.EOF},
{"8158", calls{"Uint", "Uint"}, withoutInputLimit, io.EOF}, {"8180", calls{"Uint", "Uint"}, withoutInputLimit, io.EOF},
{"C0", calls{"List", "ListEnd", "List"}, withoutInputLimit, io.EOF}, {"C0", calls{"List", "ListEnd", "List"}, withoutInputLimit, io.EOF},
// Input limit errors. // Input limit errors.
@ -153,11 +157,11 @@ func TestStreamErrors(t *testing.T) {
// down toward zero in Stream.remaining, reading too far can overflow // down toward zero in Stream.remaining, reading too far can overflow
// remaining to a large value, effectively disabling the limit. // remaining to a large value, effectively disabling the limit.
{"C40102030401", calls{"Raw", "Uint"}, withCustomInputLimit(5), io.EOF}, {"C40102030401", calls{"Raw", "Uint"}, withCustomInputLimit(5), io.EOF},
{"C4010203048158", calls{"Raw", "Uint"}, withCustomInputLimit(6), ErrValueTooLarge}, {"C4010203048180", calls{"Raw", "Uint"}, withCustomInputLimit(6), ErrValueTooLarge},
// Check that the same calls are fine without a limit. // Check that the same calls are fine without a limit.
{"C40102030401", calls{"Raw", "Uint"}, withoutInputLimit, nil}, {"C40102030401", calls{"Raw", "Uint"}, withoutInputLimit, nil},
{"C4010203048158", calls{"Raw", "Uint"}, withoutInputLimit, nil}, {"C4010203048180", calls{"Raw", "Uint"}, withoutInputLimit, nil},
// Unexpected EOF. This only happens when there is // Unexpected EOF. This only happens when there is
// no input limit, so the reader needs to be 'dumbed down'. // no input limit, so the reader needs to be 'dumbed down'.
@ -349,6 +353,7 @@ var decodeTests = []decodeTest{
// byte arrays // byte arrays
{input: "02", ptr: new([1]byte), value: [1]byte{2}}, {input: "02", ptr: new([1]byte), value: [1]byte{2}},
{input: "8180", ptr: new([1]byte), value: [1]byte{128}},
{input: "850102030405", ptr: new([5]byte), value: [5]byte{1, 2, 3, 4, 5}}, {input: "850102030405", ptr: new([5]byte), value: [5]byte{1, 2, 3, 4, 5}},
// byte array errors // byte array errors
@ -359,6 +364,7 @@ var decodeTests = []decodeTest{
{input: "C3010203", ptr: new([5]byte), error: "rlp: expected input string or byte for [5]uint8"}, {input: "C3010203", ptr: new([5]byte), error: "rlp: expected input string or byte for [5]uint8"},
{input: "86010203040506", ptr: new([5]byte), error: "rlp: input string too long for [5]uint8"}, {input: "86010203040506", ptr: new([5]byte), error: "rlp: input string too long for [5]uint8"},
{input: "8105", ptr: new([1]byte), error: "rlp: non-canonical size information for [1]uint8"}, {input: "8105", ptr: new([1]byte), error: "rlp: non-canonical size information for [1]uint8"},
{input: "817F", ptr: new([1]byte), error: "rlp: non-canonical size information for [1]uint8"},
// zero sized byte arrays // zero sized byte arrays
{input: "80", ptr: new([0]byte), value: [0]byte{}}, {input: "80", ptr: new([0]byte), value: [0]byte{}},
@ -427,7 +433,8 @@ var decodeTests = []decodeTest{
{input: "80", ptr: new(*uint), value: uintp(0)}, {input: "80", ptr: new(*uint), value: uintp(0)},
{input: "C0", ptr: new(*uint), error: "rlp: expected input string or byte for uint"}, {input: "C0", ptr: new(*uint), error: "rlp: expected input string or byte for uint"},
{input: "07", ptr: new(*uint), value: uintp(7)}, {input: "07", ptr: new(*uint), value: uintp(7)},
{input: "8158", ptr: new(*uint), value: uintp(0x58)}, {input: "817F", ptr: new(*uint), error: "rlp: non-canonical size information for uint"},
{input: "8180", ptr: new(*uint), value: uintp(0x80)},
{input: "C109", ptr: new(*[]uint), value: &[]uint{9}}, {input: "C109", ptr: new(*[]uint), value: &[]uint{9}},
{input: "C58403030303", ptr: new(*[][]byte), value: &[][]byte{{3, 3, 3, 3}}}, {input: "C58403030303", ptr: new(*[][]byte), value: &[][]byte{{3, 3, 3, 3}}},