1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157

package cmd

import (
	"bytes"
	"errors"
	"fmt"
	"io"
	"os"
	"os/exec"
	"path/filepath"
	"strings"

	"filippo.io/age"
	"filippo.io/age/agessh"
	"github.com/bmatcuk/doublestar/v4"
	"github.com/urfave/cli/v2"
)

var (
	version = "develop"
	debug   = false
)

const REKEY = "GIT_AGE_REKEY"

func New() *cli.App {
	app := cli.NewApp()
	app.Name = "git-age"
	app.Version = version
	app.Usage = "Git encryption using age"
	app.Commands = []*cli.Command{
		Clean,
		Identity,
		Init,
		Rekey,
		Smudge,
		TextConv,
	}
	app.Flags = []cli.Flag{
		&cli.BoolFlag{
			Name:        "debug",
			Aliases:     []string{"d"},
			Usage:       "Debug mode",
			Destination: &debug,
		},
	}
	return app
}

func parseIdentityFile(file string) ([]age.Identity, error) {
	fi, err := os.Open(file)
	if err != nil {
		return nil, err
	}
	defer fi.Close()

	// First try age
	i, err := age.ParseIdentities(fi)
	if err != nil {
		if debug {
			fmt.Fprintf(os.Stderr, "could not parse %q as age identities, trying ssh next: %v\n", file, err)
		}
		ageErr := err

		// Fall back to ssh
		fi.Seek(0, 0)
		content, err := io.ReadAll(fi)
		if err != nil {
			return nil, err
		}
		si, err := agessh.ParseIdentity(content)
		if err != nil {
			return nil, fmt.Errorf("could not parse identity file: age -> %w, ssh -> %w", ageErr, err)
		}
		i = []age.Identity{si}
	}
	return i, nil
}

func ageRecipients(file string) ([]age.Recipient, error) {
	cfg, err := LoadConfig()
	if err != nil {
		return nil, err
	}
	for glob, val := range cfg {
		match, err := doublestar.Match(glob, file)
		if err != nil {
			return nil, fmt.Errorf("bad glob %q: %w", glob, err)
		}
		if match {
			return val.Recipients()
		}
	}
	return nil, fmt.Errorf("no config found for %q", file)
}

var ErrNoIdentities = errors.New("no identities found")

func listIdentities() ([]string, error) {
	out, err := cmd("git", "config", "--get-all", "git-age.identity")
	if err != nil {
		if out == "" {
			return nil, ErrNoIdentities
		}
		return nil, err
	}
	return strings.Fields(out), nil
}

func ageIdentities() ([]age.Identity, error) {
	keyFiles, err := listIdentities()
	if err != nil {
		return nil, err
	}

	var identities []age.Identity
	for _, keyFile := range keyFiles {
		i, err := parseIdentityFile(keyFile)
		if err != nil {
			return identities, err
		}
		identities = append(identities, i...)
	}
	return identities, nil
}

func gitBaseDir() (string, error) {
	out, err := cmd("git", "rev-parse", "--show-toplevel")
	if err != nil {
		return "", err
	}
	stdout := strings.TrimSpace(string(out))
	return stdout, nil
}

func gitConfigDir(file string) (string, error) {
	stdout, err := gitBaseDir()
	if err != nil {
		return "", err
	}
	normalFile := strings.ReplaceAll(file, string(filepath.Separator), "!")
	dir := filepath.Join(stdout, ".git", "git-age", normalFile)
	return dir, os.MkdirAll(dir, os.ModePerm)
}

func cmd(command string, args ...string) (string, error) {
	var stdout bytes.Buffer
	c := exec.Command(command, args...)
	c.Stdout = &stdout
	if debug {
		c.Stderr = os.Stderr
	}
	if err := c.Run(); err != nil {
		return "", err
	}
	return stdout.String(), nil
}