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//
// Copyright (c) SAS Institute Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package authenticode
import (
"context"
"crypto"
"crypto/x509/pkix"
"encoding/asn1"
"encoding/binary"
"encoding/hex"
"errors"
"time"
"unicode/utf16"
"github.com/google/uuid"
"github.com/sassoftware/relic/v7/lib/certloader"
"github.com/sassoftware/relic/v7/lib/pkcs7"
"github.com/sassoftware/relic/v7/lib/pkcs9"
"github.com/sassoftware/relic/v7/lib/x509tools"
)
type Catalog struct {
Version int
Hash crypto.Hash
Sha1Entries, Sha2Entries []CertTrustEntry
}
func NewCatalog(hash crypto.Hash) *Catalog {
if hash == crypto.SHA1 {
return &Catalog{Version: 1, Hash: hash}
}
return &Catalog{Version: 2, Hash: hash}
}
func (cat *Catalog) makeCatalog() CertTrustList {
memberOid := OidCatalogListMember
if cat.Version == 2 {
memberOid = OidCatalogListMemberV2
}
listID := uuid.Must(uuid.NewRandom())
return CertTrustList{
SubjectUsage: []asn1.ObjectIdentifier{OidCatalogList},
ListIdentifier: listID[:],
EffectiveDate: time.Now().UTC(),
SubjectAlgorithm: pkix.AlgorithmIdentifier{Algorithm: memberOid, Parameters: asn1.NullRawValue},
Entries: append(cat.Sha2Entries, cat.Sha1Entries...),
}
}
func (cat *Catalog) Marshal() ([]byte, error) {
return asn1.Marshal(cat.makeCatalog())
}
func (cat *Catalog) Sign(ctx context.Context, cert *certloader.Certificate, params *OpusParams) (*pkcs9.TimestampedSignature, error) {
sig := pkcs7.NewBuilder(cert.Signer(), cert.Chain(), cat.Hash)
if err := sig.SetContent(OidCertTrustList, cat.makeCatalog()); err != nil {
return nil, err
}
if err := addOpusAttrs(sig, params); err != nil {
return nil, err
}
psd, err := sig.Sign()
if err != nil {
return nil, err
}
return pkcs9.TimestampAndMarshal(ctx, psd, cert.Timestamper, true)
}
func (cat *Catalog) Add(indirect SpcIndirectDataContentPe) error {
sha2 := !indirect.MessageDigest.DigestAlgorithm.Algorithm.Equal(x509tools.OidDigestSHA1)
if sha2 && cat.Version == 1 {
return errors.New("can't add SHA2 digest to v1 catalog")
}
indirectBytes, err := asn1.Marshal(indirect)
if err != nil {
return err
}
indirectEntry := CertTrustValue{Attribute: OidSpcIndirectDataContent, Value: makeSet(indirectBytes)}
value := indirect.MessageDigest.Digest
if cat.Version == 1 {
memberInfo := CertTrustMemberInfoV1{
ClassID: x509tools.ToBMPString(CryptSipCreateIndirectData),
Unknown1: 512,
}
memberInfoEnc, err := asn1.Marshal(memberInfo)
if err != nil {
return err
}
catValue := CertTrustValue{Attribute: OidCatalogMemberInfo, Value: makeSet(memberInfoEnc)}
cat.Sha1Entries = append(cat.Sha1Entries, CertTrustEntry{
Tag: tagV1(value),
Values: []CertTrustValue{indirectEntry, catValue},
})
} else {
// this supposed to always be empty?
memberInfoEnc := []byte{0x80, 0}
catValue := CertTrustValue{Attribute: OidCatalogMemberInfoV2, Value: makeSet(memberInfoEnc)}
if sha2 {
cat.Sha2Entries = append(cat.Sha2Entries, CertTrustEntry{
Tag: value,
Values: []CertTrustValue{catValue, indirectEntry},
})
} else {
cat.Sha1Entries = append(cat.Sha1Entries, CertTrustEntry{
Tag: value,
Values: []CertTrustValue{catValue},
})
}
}
return nil
}
func tagV1(value []byte) []byte {
// The tag is a UTF-16-LE encoding of the hex of the imprint
runes := utf16.Encode([]rune(hex.EncodeToString(value)))
tag := make([]byte, 2*len(runes))
for i, r := range runes {
binary.LittleEndian.PutUint16(tag[i*2:], r)
}
return tag
}
func makeSet(contents []byte) asn1.RawValue {
return asn1.RawValue{Tag: asn1.TagSet, IsCompound: true, Bytes: contents}
}
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