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// Copyright (c) 2020-2022, Sylabs Inc. All rights reserved.
// This software is licensed under a 3-clause BSD license. Please consult the LICENSE.md file
// distributed with the sources of this project regarding your rights to use or distribute this
// software.
package main
import (
"bytes"
"errors"
"log"
"os"
"path/filepath"
"time"
"github.com/ProtonMail/go-crypto/openpgp"
"github.com/sylabs/sif/v2/pkg/integrity"
"github.com/sylabs/sif/v2/pkg/sif"
)
var errUnexpectedNumEntities = errors.New("unexpected number of entities")
func getEntity() (*openpgp.Entity, error) {
f, err := os.Open(filepath.Join("keys", "private.asc"))
if err != nil {
return nil, err
}
defer f.Close()
el, err := openpgp.ReadArmoredKeyRing(f)
if err != nil {
return nil, err
}
if len(el) != 1 {
return nil, errUnexpectedNumEntities
}
return el[0], nil
}
func generateImages() error {
e, err := getEntity()
if err != nil {
return err
}
objectGenericJSON := func() (sif.DescriptorInput, error) {
return sif.NewDescriptorInput(sif.DataGenericJSON,
bytes.NewReader([]byte{0x7b, 0x7d}),
sif.OptObjectName("data.json"),
)
}
objectCryptoMessage := func() (sif.DescriptorInput, error) {
return sif.NewDescriptorInput(sif.DataCryptoMessage,
bytes.NewReader([]byte{0xfe, 0xfe, 0xf0, 0xf0}),
sif.OptCryptoMessageMetadata(sif.FormatOpenPGP, sif.MessageClearSignature),
)
}
objectSBOM := func() (sif.DescriptorInput, error) {
b, err := os.ReadFile(filepath.Join("input", "sbom.cdx.json"))
if err != nil {
return sif.DescriptorInput{}, err
}
return sif.NewDescriptorInput(sif.DataSBOM, bytes.NewReader(b),
sif.OptSBOMMetadata(sif.SBOMFormatCycloneDXJSON),
)
}
partSystem := func() (sif.DescriptorInput, error) {
return sif.NewDescriptorInput(sif.DataPartition,
bytes.NewReader([]byte{0xfa, 0xce, 0xfe, 0xed}),
sif.OptPartitionMetadata(sif.FsRaw, sif.PartSystem, "386"),
)
}
partPrimSys := func() (sif.DescriptorInput, error) {
b, err := os.ReadFile(filepath.Join("input", "root.squashfs"))
if err != nil {
return sif.DescriptorInput{}, err
}
return sif.NewDescriptorInput(sif.DataPartition, bytes.NewReader(b),
sif.OptPartitionMetadata(sif.FsSquash, sif.PartPrimSys, "386"),
)
}
partSystemGroup2 := func() (sif.DescriptorInput, error) {
b, err := os.ReadFile(filepath.Join("input", "root.ext3"))
if err != nil {
return sif.DescriptorInput{}, err
}
return sif.NewDescriptorInput(sif.DataPartition, bytes.NewReader(b),
sif.OptPartitionMetadata(sif.FsExt3, sif.PartSystem, "amd64"),
sif.OptGroupID(2),
)
}
images := []struct {
path string
diFns []func() (sif.DescriptorInput, error)
opts []sif.CreateOpt
sign bool
}{
// Images with no objects.
{
path: "empty.sif",
},
{
path: "empty-id.sif",
opts: []sif.CreateOpt{
sif.OptCreateWithID("3fa802cc-358b-45e3-bcc0-69dc7a45f9f8"),
},
},
{
path: "empty-launch-script.sif",
opts: []sif.CreateOpt{
sif.OptCreateWithLaunchScript("#!/usr/bin/env run-script\n"),
},
},
// Images with one data object in one group.
{
path: "one-object-time.sif",
opts: []sif.CreateOpt{
sif.OptCreateWithTime(time.Date(2020, 6, 30, 0, 1, 56, 0, time.UTC)),
},
diFns: []func() (sif.DescriptorInput, error){
objectGenericJSON,
},
},
{
path: "one-object-generic-json.sif",
diFns: []func() (sif.DescriptorInput, error){
objectGenericJSON,
},
},
{
path: "one-object-crypt-message.sif",
diFns: []func() (sif.DescriptorInput, error){
objectCryptoMessage,
},
},
{
path: "one-object-sbom.sif",
diFns: []func() (sif.DescriptorInput, error){
objectSBOM,
},
},
// Images with two partitions in one group.
{
path: "one-group.sif",
diFns: []func() (sif.DescriptorInput, error){
partSystem,
partPrimSys,
},
},
{
path: "one-group-signed.sif",
diFns: []func() (sif.DescriptorInput, error){
partSystem,
partPrimSys,
},
sign: true,
},
// Images with three partitions in two groups.
{
path: "two-groups.sif",
diFns: []func() (sif.DescriptorInput, error){
partSystem,
partPrimSys,
partSystemGroup2,
},
},
{
path: "two-groups-signed.sif",
diFns: []func() (sif.DescriptorInput, error){
partSystem,
partPrimSys,
partSystemGroup2,
},
sign: true,
},
}
for _, image := range images {
dis := make([]sif.DescriptorInput, 0, len(image.diFns))
for _, fn := range image.diFns {
di, err := fn()
if err != nil {
return err
}
dis = append(dis, di)
}
opts := []sif.CreateOpt{
sif.OptCreateDeterministic(),
sif.OptCreateWithDescriptors(dis...),
}
opts = append(opts, image.opts...)
f, err := sif.CreateContainerAtPath(filepath.Join("images", image.path), opts...)
if err != nil {
return err
}
defer func() {
if err := f.UnloadContainer(); err != nil {
log.Printf("failed to unload container: %v", err)
}
}()
if image.sign {
s, err := integrity.NewSigner(f,
integrity.OptSignWithEntity(e),
integrity.OptSignWithTime(func() time.Time { return time.Date(2020, 6, 30, 0, 1, 56, 0, time.UTC) }),
integrity.OptSignDeterministic(),
)
if err != nil {
return err
}
if err := s.Sign(); err != nil {
return err
}
}
}
return nil
}
func main() {
if err := generateImages(); err != nil {
log.Fatal(err)
}
}
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