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// Copyright (c) 2017-2023, 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 cli
import (
"crypto"
"github.com/sigstore/sigstore/pkg/cryptoutils"
"github.com/sigstore/sigstore/pkg/signature"
"github.com/spf13/cobra"
"github.com/sylabs/singularity/v4/docs"
sifsignature "github.com/sylabs/singularity/v4/internal/pkg/signature"
"github.com/sylabs/singularity/v4/internal/pkg/sypgp"
"github.com/sylabs/singularity/v4/pkg/cmdline"
"github.com/sylabs/singularity/v4/pkg/sylog"
)
var (
priKeyPath string
priKeyIdx int
signAll bool
)
// -g|--group-id
var signSifGroupIDFlag = cmdline.Flag{
ID: "signSifGroupIDFlag",
Value: &sifGroupID,
DefaultValue: uint32(0),
Name: "group-id",
ShortHand: "g",
Usage: "sign objects with the specified group ID",
}
// --groupid (deprecated)
var signOldSifGroupIDFlag = cmdline.Flag{
ID: "signOldSifGroupIDFlag",
Value: &sifGroupID,
DefaultValue: uint32(0),
Name: "groupid",
Usage: "sign objects with the specified group ID",
Deprecated: "use '--group-id'",
}
// -i| --sif-id
var signSifDescSifIDFlag = cmdline.Flag{
ID: "signSifDescSifIDFlag",
Value: &sifDescID,
DefaultValue: uint32(0),
Name: "sif-id",
ShortHand: "i",
Usage: "sign object with the specified ID",
}
// --id (deprecated)
var signSifDescIDFlag = cmdline.Flag{
ID: "signSifDescIDFlag",
Value: &sifDescID,
DefaultValue: uint32(0),
Name: "id",
Usage: "sign object with the specified ID",
Deprecated: "use '--sif-id'",
}
// --key
var signPrivateKeyFlag = cmdline.Flag{
ID: "privateKeyFlag",
Value: &priKeyPath,
DefaultValue: "",
Name: "key",
Usage: "path to the private key file",
EnvKeys: []string{"SIGN_KEY"},
}
// -k|--keyidx
var signKeyIdxFlag = cmdline.Flag{
ID: "signKeyIdxFlag",
Value: &priKeyIdx,
DefaultValue: 0,
Name: "keyidx",
ShortHand: "k",
Usage: "PGP private key to use (index from 'key list --secret')",
}
// -a|--all (deprecated)
var signAllFlag = cmdline.Flag{
ID: "signAllFlag",
Value: &signAll,
DefaultValue: false,
Name: "all",
ShortHand: "a",
Usage: "sign all objects",
Deprecated: "now the default behavior",
}
func init() {
addCmdInit(func(cmdManager *cmdline.CommandManager) {
cmdManager.RegisterCmd(SignCmd)
cmdManager.RegisterFlagForCmd(&signSifGroupIDFlag, SignCmd)
cmdManager.RegisterFlagForCmd(&signOldSifGroupIDFlag, SignCmd)
cmdManager.RegisterFlagForCmd(&signSifDescSifIDFlag, SignCmd)
cmdManager.RegisterFlagForCmd(&signSifDescIDFlag, SignCmd)
cmdManager.RegisterFlagForCmd(&signPrivateKeyFlag, SignCmd)
cmdManager.RegisterFlagForCmd(&signKeyIdxFlag, SignCmd)
cmdManager.RegisterFlagForCmd(&signAllFlag, SignCmd)
})
}
// SignCmd singularity sign
var SignCmd = &cobra.Command{
DisableFlagsInUseLine: true,
Args: cobra.ExactArgs(1),
Run: func(cmd *cobra.Command, args []string) {
// args[0] contains image path
doSignCmd(cmd, args[0])
},
Use: docs.SignUse,
Short: docs.SignShort,
Long: docs.SignLong,
Example: docs.SignExample,
}
func doSignCmd(cmd *cobra.Command, cpath string) {
var opts []sifsignature.SignOpt
// Set key material.
switch {
case cmd.Flag(signPrivateKeyFlag.Name).Changed:
sylog.Infof("Signing image with key material from '%v'", priKeyPath)
s, err := signature.LoadSignerFromPEMFile(priKeyPath, crypto.SHA256, cryptoutils.GetPasswordFromStdIn)
if err != nil {
sylog.Fatalf("Failed to load key material: %v", err)
}
opts = append(opts, sifsignature.OptSignWithSigner(s))
default:
sylog.Infof("Signing image with PGP key material")
// Set entity selector option, and ensure the entity is decrypted.
var f sypgp.EntitySelector
if cmd.Flag(signKeyIdxFlag.Name).Changed {
f = selectEntityAtIndex(priKeyIdx)
} else {
f = selectEntityInteractive()
}
f = decryptSelectedEntityInteractive(f)
opts = append(opts, sifsignature.OptSignEntitySelector(f))
}
// Set group option, if applicable.
if cmd.Flag(signSifGroupIDFlag.Name).Changed || cmd.Flag(signOldSifGroupIDFlag.Name).Changed {
opts = append(opts, sifsignature.OptSignGroup(sifGroupID))
}
// Set object option, if applicable.
if cmd.Flag(signSifDescSifIDFlag.Name).Changed || cmd.Flag(signSifDescIDFlag.Name).Changed {
opts = append(opts, sifsignature.OptSignObjects(sifDescID))
}
// Sign the image.
if err := sifsignature.Sign(cmd.Context(), cpath, opts...); err != nil {
sylog.Fatalf("Failed to sign container: %v", err)
}
sylog.Infof("Signature created and applied to image '%v'", cpath)
}
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