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signer.go
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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 ps
// Sign Microsoft PowerShell scripts, modules, and other bits that can be signed
import (
"errors"
"io"
"os"
"path/filepath"
"strings"
"github.com/sassoftware/relic/v8/lib/authenticode"
"github.com/sassoftware/relic/v8/lib/certloader"
"github.com/sassoftware/relic/v8/lib/x509tools"
"github.com/sassoftware/relic/v8/signers"
"github.com/sassoftware/relic/v8/signers/pecoff"
)
var PsSigner = &signers.Signer{
Name: "ps",
CertTypes: signers.CertTypeX509,
TestPath: testPath,
Transform: transform,
Sign: sign,
Verify: verify,
}
func init() {
PsSigner.Flags().String("ps-style", "", "(Powershell) signature type")
pecoff.AddOpusFlags(PsSigner)
signers.Register(PsSigner)
}
func testPath(fp string) bool {
_, ok := authenticode.GetSigStyle(fp)
return ok
}
func transform(f *os.File, opts signers.SignOpts) (signers.Transformer, error) {
// detect signature style and explicitly set it for the request
argStyle := opts.Flags.GetString("ps-style")
if argStyle == "" {
argStyle = filepath.Ext(opts.Path)
}
opts.Flags.Values["ps-style"] = argStyle
return signers.DefaultTransform(f), nil
}
func sign(r io.Reader, cert *certloader.Certificate, opts signers.SignOpts) ([]byte, error) {
argStyle := opts.Flags.GetString("ps-style")
if argStyle == "" {
argStyle = opts.Path
}
style, err := getStyle(argStyle)
if err != nil {
return nil, err
}
digest, err := authenticode.DigestPowershell(r, style, opts.Hash)
if err != nil {
return nil, err
}
patch, ts, err := digest.Sign(opts.Context(), cert, pecoff.OpusFlags(opts))
if err != nil {
return nil, err
}
opts.Audit.SetCounterSignature(ts.CounterSignature)
return opts.SetBinPatch(patch)
}
func verify(f *os.File, opts signers.VerifyOpts) ([]*signers.Signature, error) {
style, err := getStyle(f.Name())
if err != nil {
return nil, err
}
ts, err := authenticode.VerifyPowershell(f, style, opts.NoDigests)
if err != nil {
return nil, err
}
hash, _ := x509tools.PkixDigestToHash(ts.SignerInfo.DigestAlgorithm)
return []*signers.Signature{{
Hash: hash,
X509Signature: &ts.TimestampedSignature,
SigInfo: pecoff.FormatOpus(ts.OpusInfo),
}}, nil
}
func getStyle(name string) (authenticode.PsSigStyle, error) {
style, ok := authenticode.GetSigStyle(name)
if !ok {
return 0, errors.New("unknown powershell style, expected: " + strings.Join(authenticode.AllSigStyles(), " "))
}
return style, nil
}