forked from sassoftware/relic
/
signer.go
73 lines (65 loc) · 2.01 KB
/
signer.go
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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 pecoff
// Sign Microsoft PE/COFF executables
import (
"io"
"os"
"github.com/sassoftware/relic/lib/authenticode"
"github.com/sassoftware/relic/lib/certloader"
"github.com/sassoftware/relic/lib/magic"
"github.com/sassoftware/relic/signers"
)
var PeSigner = &signers.Signer{
Name: "pe-coff",
Magic: magic.FileTypePECOFF,
CertTypes: signers.CertTypeX509,
Sign: sign,
Fixup: authenticode.FixPEChecksum,
Verify: verify,
}
func init() {
PeSigner.Flags().Bool("page-hashes", false, "(PE-COFF) Add page hashes to signature")
signers.Register(PeSigner)
}
func sign(r io.Reader, cert *certloader.Certificate, opts signers.SignOpts) ([]byte, error) {
pageHashes := opts.Flags.GetBool("page-hashes")
digest, err := authenticode.DigestPE(r, opts.Hash, pageHashes)
if err != nil {
return nil, err
}
patch, ts, err := digest.Sign(opts.Context(), cert)
if err != nil {
return nil, err
}
opts.Audit.Attributes["pe-coff.pagehashes"] = pageHashes
opts.Audit.SetCounterSignature(ts.CounterSignature)
return opts.SetBinPatch(patch)
}
func verify(f *os.File, opts signers.VerifyOpts) ([]*signers.Signature, error) {
sigs, err := authenticode.VerifyPE(f, opts.NoDigests)
if err != nil {
return nil, err
}
var ret []*signers.Signature
for _, sig := range sigs {
ret = append(ret, &signers.Signature{
Hash: sig.ImageHashFunc,
X509Signature: &sig.TimestampedSignature,
})
}
return ret, nil
}