github.com/meulengracht/snapd@v0.0.0-20210719210640-8bde69bcc84e/cmd/snap/cmd_sign_build.go (about)

     1  // -*- Mode: Go; indent-tabs-mode: t -*-
     2  
     3  /*
     4   * Copyright (C) 2014-2021 Canonical Ltd
     5   *
     6   * This program is free software: you can redistribute it and/or modify
     7   * it under the terms of the GNU General Public License version 3 as
     8   * published by the Free Software Foundation.
     9   *
    10   * This program is distributed in the hope that it will be useful,
    11   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    12   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    13   * GNU General Public License for more details.
    14   *
    15   * You should have received a copy of the GNU General Public License
    16   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    17   *
    18   */
    19  
    20  package main
    21  
    22  import (
    23  	"fmt"
    24  	"time"
    25  
    26  	"github.com/jessevdk/go-flags"
    27  
    28  	// expected for digests
    29  	_ "golang.org/x/crypto/sha3"
    30  
    31  	"github.com/snapcore/snapd/asserts"
    32  	"github.com/snapcore/snapd/i18n"
    33  )
    34  
    35  type cmdSignBuild struct {
    36  	Positional struct {
    37  		Filename string
    38  	} `positional-args:"yes" required:"yes"`
    39  
    40  	// XXX complete DeveloperID and SnapID
    41  	DeveloperID string  `long:"developer-id" required:"yes"`
    42  	SnapID      string  `long:"snap-id" required:"yes"`
    43  	KeyName     keyName `short:"k" default:"default" `
    44  	Grade       string  `long:"grade" choice:"devel" choice:"stable" default:"stable"`
    45  }
    46  
    47  var shortSignBuildHelp = i18n.G("Create a snap-build assertion")
    48  var longSignBuildHelp = i18n.G(`
    49  The sign-build command creates a snap-build assertion for the provided
    50  snap file.
    51  `)
    52  
    53  func init() {
    54  	cmd := addCommand("sign-build",
    55  		shortSignBuildHelp,
    56  		longSignBuildHelp,
    57  		func() flags.Commander {
    58  			return &cmdSignBuild{}
    59  		}, map[string]string{
    60  			// TRANSLATORS: This should not start with a lowercase letter.
    61  			"developer-id": i18n.G("Identifier of the signer"),
    62  			// TRANSLATORS: This should not start with a lowercase letter.
    63  			"snap-id": i18n.G("Identifier of the snap package associated with the build"),
    64  			// TRANSLATORS: This should not start with a lowercase letter.
    65  			"k": i18n.G("Name of the GnuPG key to use (defaults to 'default' as key name)"),
    66  			// TRANSLATORS: This should not start with a lowercase letter.
    67  			"grade": i18n.G("Grade states the build quality of the snap (defaults to 'stable')"),
    68  		}, []argDesc{{
    69  			// TRANSLATORS: This needs to begin with < and end with >
    70  			name: i18n.G("<filename>"),
    71  			// TRANSLATORS: This should not start with a lowercase letter.
    72  			desc: i18n.G("Filename of the snap you want to assert a build for"),
    73  		}})
    74  	cmd.hidden = true
    75  }
    76  
    77  func (x *cmdSignBuild) Execute(args []string) error {
    78  	if len(args) > 0 {
    79  		return ErrExtraArgs
    80  	}
    81  
    82  	snapDigest, snapSize, err := asserts.SnapFileSHA3_384(x.Positional.Filename)
    83  	if err != nil {
    84  		return err
    85  	}
    86  
    87  	keypairMgr, err := getKeypairManager()
    88  	if err != nil {
    89  		return err
    90  	}
    91  	privKey, err := keypairMgr.GetByName(string(x.KeyName))
    92  	if err != nil {
    93  		// TRANSLATORS: %q is the key name, %v the error message
    94  		return fmt.Errorf(i18n.G("cannot use %q key: %v"), x.KeyName, err)
    95  	}
    96  
    97  	pubKey := privKey.PublicKey()
    98  	timestamp := time.Now().Format(time.RFC3339)
    99  
   100  	headers := map[string]interface{}{
   101  		"developer-id":  x.DeveloperID,
   102  		"authority-id":  x.DeveloperID,
   103  		"snap-sha3-384": snapDigest,
   104  		"snap-id":       x.SnapID,
   105  		"snap-size":     fmt.Sprintf("%d", snapSize),
   106  		"grade":         x.Grade,
   107  		"timestamp":     timestamp,
   108  	}
   109  
   110  	adb, err := asserts.OpenDatabase(&asserts.DatabaseConfig{
   111  		KeypairManager: keypairMgr,
   112  	})
   113  	if err != nil {
   114  		return fmt.Errorf(i18n.G("cannot open the assertions database: %v"), err)
   115  	}
   116  
   117  	a, err := adb.Sign(asserts.SnapBuildType, headers, nil, pubKey.ID())
   118  	if err != nil {
   119  		return fmt.Errorf(i18n.G("cannot sign assertion: %v"), err)
   120  	}
   121  
   122  	_, err = Stdout.Write(asserts.Encode(a))
   123  	if err != nil {
   124  		return err
   125  	}
   126  
   127  	return nil
   128  }