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Cut #6.500, #6.502 in FromCOSE
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Top level tags are not interpretable as a COSE object.
The protected header content-type is not meant to be
application/rim+cbor according to the spec draft (Issue #132).

Support the spec's optional unsigned corim tag in COSE payload.

Signed-off-by: Dionna Glaze <[email protected]>
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@deeglaze
deeglaze committed Oct 25, 2024
1 parent fe09de9 commit e6351ec
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Showing 4 changed files with 116 additions and 7 deletions.
8 changes: 5 additions & 3 deletions corim/cbor.go
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Original file line number Diff line number Diff line change
Expand Up @@ -17,11 +17,13 @@ var (
)

var (
CoswidTag = []byte{0xd9, 0x01, 0xf9} // 505()
ComidTag = []byte{0xd9, 0x01, 0xfa} // 506()
UnsignedCorimTag = []byte{0xd9, 0x01, 0xf5} // 501()
CoswidTag = []byte{0xd9, 0x01, 0xf9} // 505()
ComidTag = []byte{0xd9, 0x01, 0xfa} // 506()

corimTagsMap = map[uint64]interface{}{
32: comid.TaggedURI(""),
32: comid.TaggedURI(""),
501: TaggedUnsignedCorim(UnsignedCorim{}),
}
)

Expand Down
15 changes: 14 additions & 1 deletion corim/signedcorim.go
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@
package corim

import (
"bytes"
"crypto"
"crypto/rand"
"errors"
Expand All @@ -15,7 +16,8 @@ import (
)

var (
ContentType = "application/rim+cbor"
ContentType = "application/unsigned-corim+cbor"
oldContentType = "application/rim+cbor"
NoExternalData = []byte("")
HeaderLabelCorimMeta = int64(8)
)
Expand Down Expand Up @@ -63,6 +65,11 @@ func (o *SignedCorim) processHdrs() error {
return errors.New("missing mandatory content type")
}

// Compatibility step from older spec draft
if v == oldContentType {
v = ContentType
}

if v != ContentType {
return fmt.Errorf("expecting content type %q, got %q instead", ContentType, v)
}
Expand Down Expand Up @@ -100,6 +107,12 @@ func (o *SignedCorim) processHdrs() error {
func (o *SignedCorim) FromCOSE(buf []byte) error {
o.message = cose.NewSign1Message()

// If a tagged-corim-type-choice #6.500 of tagged-signed-corim #6.502, strip the prefix.
// This is a remnant of an older draft of the specification before
// https://github.com/ietf-rats-wg/draft-ietf-rats-corim/pull/337
corimTypeChoice := []byte("\xd9\x01\xf4\xd9\x01\xf6")
buf, _ = bytes.CutPrefix(buf, corimTypeChoice)

if err := o.message.UnmarshalCBOR(buf); err != nil {
return fmt.Errorf("failed CBOR decoding for COSE-Sign1 signed CoRIM: %w", err)
}
Expand Down
98 changes: 95 additions & 3 deletions corim/signedcorim_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -177,6 +177,98 @@ func TestSignedCorim_FromCOSE_ok(t *testing.T) {
assert.Nil(t, err)
}

func TestSignedCorim_TaggedFromCOSE_ok(t *testing.T) {
/*
500(
502(
18(
[
/ protected h'a10126' / << {
/ alg / 1: -7, / ECDSA 256 /
/ content-type / 3: "application/rim+cbor",
/ issuer-key-id / 4: '[email protected]',
/ corim-meta / 8: h'a200a1006941434d45204c74642e01a101c11a5fad2056'
} >>,
/ unprotected / {},
/ payload / << 501({
0: "test corim id",
1: [
h'D901FAA40065656E2D474201A1005043BBE37F2E614B33AED353CFF1428B160281A3006941434D45204C74642E01D8207468747470733A2F2F61636D652E6578616D706C65028300010204A1008182A100A300D90258582061636D652D696D706C656D656E746174696F6E2D69642D303030303030303031016441434D45026A526F616452756E6E657283A200D90258A30162424C0465322E312E30055820ACBB11C7E4DA217205523CE4CE1A245AE1A239AE3C6BFD9E7871F7E5D8BAE86B01A102818201582087428FC522803D31065E7BCE3CF03FE475096631E5E07BBD7A0FDE60C4CF25C7A200D90258A3016450526F540465312E332E35055820ACBB11C7E4DA217205523CE4CE1A245AE1A239AE3C6BFD9E7871F7E5D8BAE86B01A10281820158200263829989B6FD954F72BAAF2FC64BC2E2F01D692D4DE72986EA808F6E99813FA200D90258A3016441526F540465302E312E34055820ACBB11C7E4DA217205523CE4CE1A245AE1A239AE3C6BFD9E7871F7E5D8BAE86B01A1028182015820A3A5E715F0CC574A73C3F9BEBB6BC24F32FFD5B67B387244C2C909DA779A1478'
]
}) >>,
/ signature / h'deadbeef'
]
)))
*/
tv := []byte{0xd9, 0x01, 0xf4, 0xd9, 0x01, 0xf6, 0xd2, 0x84,
0x58, 0x59, 0xa4, 0x01, 0x26, 0x03, 0x74, 0x61, 0x70,
0x70, 0x6c, 0x69, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e,
0x2f, 0x72, 0x69, 0x6d, 0x2b, 0x63, 0x62, 0x6f, 0x72,
0x04, 0x58, 0x24, 0x6d, 0x65, 0x72, 0x69, 0x61, 0x64,
0x6f, 0x63, 0x2e, 0x62, 0x72, 0x61, 0x6e, 0x64, 0x79,
0x62, 0x75, 0x63, 0x6b, 0x40, 0x62, 0x75, 0x63, 0x6b,
0x6c, 0x61, 0x6e, 0x64, 0x2e, 0x65, 0x78, 0x61, 0x6d,
0x70, 0x6c, 0x65, 0x08, 0x57, 0xa2, 0x00, 0xa1, 0x00,
0x69, 0x41, 0x43, 0x4d, 0x45, 0x20, 0x4c, 0x74, 0x64,
0x2e, 0x01, 0xa1, 0x01, 0xc1, 0x1a, 0x5f, 0xad, 0x20,
0x56, 0xa0, 0x59, 0x01, 0xbb, 0xd9, 0x01, 0xf5, 0xa2,
0x00, 0x6d, 0x74, 0x65, 0x73, 0x74, 0x20, 0x63, 0x6f,
0x72, 0x69, 0x6d, 0x20, 0x69, 0x64, 0x01, 0x81, 0x59,
0x01, 0xa3, 0xd9, 0x01, 0xfa, 0xa4, 0x00, 0x65, 0x65,
0x6e, 0x2d, 0x47, 0x42, 0x01, 0xa1, 0x00, 0x50, 0x43,
0xbb, 0xe3, 0x7f, 0x2e, 0x61, 0x4b, 0x33, 0xae, 0xd3,
0x53, 0xcf, 0xf1, 0x42, 0x8b, 0x16, 0x02, 0x81, 0xa3,
0x00, 0x69, 0x41, 0x43, 0x4d, 0x45, 0x20, 0x4c, 0x74,
0x64, 0x2e, 0x01, 0xd8, 0x20, 0x74, 0x68, 0x74, 0x74,
0x70, 0x73, 0x3a, 0x2f, 0x2f, 0x61, 0x63, 0x6d, 0x65,
0x2e, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x02,
0x83, 0x00, 0x01, 0x02, 0x04, 0xa1, 0x00, 0x81, 0x82,
0xa1, 0x00, 0xa3, 0x00, 0xd9, 0x02, 0x58, 0x58, 0x20,
0x61, 0x63, 0x6d, 0x65, 0x2d, 0x69, 0x6d, 0x70, 0x6c,
0x65, 0x6d, 0x65, 0x6e, 0x74, 0x61, 0x74, 0x69, 0x6f,
0x6e, 0x2d, 0x69, 0x64, 0x2d, 0x30, 0x30, 0x30, 0x30,
0x30, 0x30, 0x30, 0x30, 0x31, 0x01, 0x64, 0x41, 0x43,
0x4d, 0x45, 0x02, 0x6a, 0x52, 0x6f, 0x61, 0x64, 0x52,
0x75, 0x6e, 0x6e, 0x65, 0x72, 0x83, 0xa2, 0x00, 0xd9,
0x02, 0x58, 0xa3, 0x01, 0x62, 0x42, 0x4c, 0x04, 0x65,
0x32, 0x2e, 0x31, 0x2e, 0x30, 0x05, 0x58, 0x20, 0xac,
0xbb, 0x11, 0xc7, 0xe4, 0xda, 0x21, 0x72, 0x05, 0x52,
0x3c, 0xe4, 0xce, 0x1a, 0x24, 0x5a, 0xe1, 0xa2, 0x39,
0xae, 0x3c, 0x6b, 0xfd, 0x9e, 0x78, 0x71, 0xf7, 0xe5,
0xd8, 0xba, 0xe8, 0x6b, 0x01, 0xa1, 0x02, 0x81, 0x82,
0x01, 0x58, 0x20, 0x87, 0x42, 0x8f, 0xc5, 0x22, 0x80,
0x3d, 0x31, 0x06, 0x5e, 0x7b, 0xce, 0x3c, 0xf0, 0x3f,
0xe4, 0x75, 0x09, 0x66, 0x31, 0xe5, 0xe0, 0x7b, 0xbd,
0x7a, 0x0f, 0xde, 0x60, 0xc4, 0xcf, 0x25, 0xc7, 0xa2,
0x00, 0xd9, 0x02, 0x58, 0xa3, 0x01, 0x64, 0x50, 0x52,
0x6f, 0x54, 0x04, 0x65, 0x31, 0x2e, 0x33, 0x2e, 0x35,
0x05, 0x58, 0x20, 0xac, 0xbb, 0x11, 0xc7, 0xe4, 0xda,
0x21, 0x72, 0x05, 0x52, 0x3c, 0xe4, 0xce, 0x1a, 0x24,
0x5a, 0xe1, 0xa2, 0x39, 0xae, 0x3c, 0x6b, 0xfd, 0x9e,
0x78, 0x71, 0xf7, 0xe5, 0xd8, 0xba, 0xe8, 0x6b, 0x01,
0xa1, 0x02, 0x81, 0x82, 0x01, 0x58, 0x20, 0x02, 0x63,
0x82, 0x99, 0x89, 0xb6, 0xfd, 0x95, 0x4f, 0x72, 0xba,
0xaf, 0x2f, 0xc6, 0x4b, 0xc2, 0xe2, 0xf0, 0x1d, 0x69,
0x2d, 0x4d, 0xe7, 0x29, 0x86, 0xea, 0x80, 0x8f, 0x6e,
0x99, 0x81, 0x3f, 0xa2, 0x00, 0xd9, 0x02, 0x58, 0xa3,
0x01, 0x64, 0x41, 0x52, 0x6f, 0x54, 0x04, 0x65, 0x30,
0x2e, 0x31, 0x2e, 0x34, 0x05, 0x58, 0x20, 0xac, 0xbb,
0x11, 0xc7, 0xe4, 0xda, 0x21, 0x72, 0x05, 0x52, 0x3c,
0xe4, 0xce, 0x1a, 0x24, 0x5a, 0xe1, 0xa2, 0x39, 0xae,
0x3c, 0x6b, 0xfd, 0x9e, 0x78, 0x71, 0xf7, 0xe5, 0xd8,
0xba, 0xe8, 0x6b, 0x01, 0xa1, 0x02, 0x81, 0x82, 0x01,
0x58, 0x20, 0xa3, 0xa5, 0xe7, 0x15, 0xf0, 0xcc, 0x57,
0x4a, 0x73, 0xc3, 0xf9, 0xbe, 0xbb, 0x6b, 0xc2, 0x4f,
0x32, 0xff, 0xd5, 0xb6, 0x7b, 0x38, 0x72, 0x44, 0xc2,
0xc9, 0x09, 0xda, 0x77, 0x9a, 0x14, 0x78, 0x44, 0xde,
0xad, 0xbe, 0xef}

var actual SignedCorim
err := actual.FromCOSE(tv)

assert.Nil(t, err)
}

func TestSignedCorim_FromCOSE_fail_no_tag(t *testing.T) {
// a single null byte is sufficient to test this condition because the tag
// is the very first thing we stumble upon
Expand All @@ -193,7 +285,7 @@ func TestSignedCorim_FromCOSE_fail_corim_bad_cbor(t *testing.T) {
[
/ protected / << {
/ alg / 1: -7, / ECDSA 256 /
/ content-type / 3: "application/rim+cbor",
/ content-type / 3: "application/unsigned-corim+cbor",
/ corim-meta / 8: h'a200a1006941434d45204c74642e01a101c11a5fad2056'
} >>,
/ unprotected / {},
Expand Down Expand Up @@ -223,7 +315,7 @@ func TestSignedCorim_FromCOSE_fail_invalid_corim(t *testing.T) {
[
/ protected / << {
/ alg / 1: -7, / ECDSA 256 /
/ content-type / 3: "application/rim+cbor",
/ content-type / 3: "application/unsigned-corim+cbor",
/ corim-meta / 8: h'a200a1006941434d45204c74642e01a101c11a5fad2056'
} >>,
/ unprotected / {},
Expand Down Expand Up @@ -304,7 +396,7 @@ func TestSignedCorim_FromCOSE_fail_unexpected_content_type(t *testing.T) {
var actual SignedCorim
err := actual.FromCOSE(tv)

assert.EqualError(t, err, `processing COSE headers: expecting content type "application/rim+cbor", got "application/cbor" instead`)
assert.EqualError(t, err, `processing COSE headers: expecting content type "application/unsigned-corim+cbor", got "application/cbor" instead`)
}

func unsignedCorimFromCBOR(t *testing.T, cbor []byte) *UnsignedCorim {
Expand Down
2 changes: 2 additions & 0 deletions corim/unsignedcorim.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,8 @@ type UnsignedCorim struct {
Extensions
}

type TaggedUnsignedCorim UnsignedCorim

// NewUnsignedCorim instantiates an empty UnsignedCorim
func NewUnsignedCorim() *UnsignedCorim {
return &UnsignedCorim{}
Expand Down

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