forked from gopasspw/gopass
/
generate.go
208 lines (179 loc) · 6.04 KB
/
generate.go
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package action
import (
"context"
"fmt"
"regexp"
"strconv"
"github.com/fatih/color"
"github.com/justwatchcom/gopass/store/secret"
"github.com/justwatchcom/gopass/store/sub"
"github.com/justwatchcom/gopass/utils/ctxutil"
"github.com/justwatchcom/gopass/utils/out"
"github.com/justwatchcom/gopass/utils/pwgen"
"github.com/justwatchcom/gopass/utils/pwgen/xkcdgen"
"github.com/justwatchcom/gopass/utils/termio"
"github.com/urfave/cli"
)
const (
defaultLength = 24
defaultXKCDLength = 4
)
var (
reNumber = regexp.MustCompile(`^\d+$`)
)
// Generate & save a password
func (s *Action) Generate(ctx context.Context, c *cli.Context) error {
force := c.Bool("force")
edit := c.Bool("edit")
name := c.Args().Get(0)
key, length := keyAndLength(c)
// ask for name of the secret if it wasn't provided already
if name == "" {
var err error
name, err = termio.AskForString(ctx, "Which name do you want to use?", "")
if err != nil || name == "" {
return exitError(ctx, ExitNoName, err, "please provide a password name")
}
}
// ask for confirmation before overwriting existing entry
if !force { // don't check if it's force anyway
if s.Store.Exists(ctx, name) && key == "" && !termio.AskForConfirmation(ctx, fmt.Sprintf("An entry already exists for %s. Overwrite the current password?", name)) {
return exitError(ctx, ExitAborted, nil, "user aborted. not overwriting your current password")
}
}
// generate password
password, err := s.generatePassword(ctx, c, length)
if err != nil {
return err
}
// write generated password to store
if err := s.generateSetPassword(ctx, name, key, password); err != nil {
return err
}
// if requested launch editor to add more data to the generated secret
if (edit || ctxutil.IsAskForMore(ctx)) && termio.AskForConfirmation(ctx, fmt.Sprintf("Do you want to add more data for %s?", name)) {
if err := s.Edit(ctx, c); err != nil {
return exitError(ctx, ExitUnknown, err, "failed to edit '%s': %s", name, err)
}
}
// display or copy to clipboard
return s.generateCopyOrPrint(ctx, c, name, key, password)
}
func keyAndLength(c *cli.Context) (string, string) {
key := c.Args().Get(1)
length := c.Args().Get(2)
// generate can be called with one positional arg or two
// one - the desired length for the "master" secret itself
// two - the key in a YAML doc and the length for a secret generated for this
// key only
if length == "" && key != "" && reNumber.MatchString(key) {
length = key
key = ""
}
return key, length
}
func (s *Action) generateCopyOrPrint(ctx context.Context, c *cli.Context, name, key, password string) error {
if c.Bool("print") {
if key != "" {
key = " " + key
}
out.Print(
ctx,
"The generated password for %s%s is:\n%s", name, key,
color.YellowString(password),
)
return nil
}
if err := copyToClipboard(ctx, name, []byte(password)); err != nil {
return exitError(ctx, ExitIO, err, "failed to copy to clipboard: %s", err)
}
return nil
}
func (s *Action) generatePassword(ctx context.Context, c *cli.Context, length string) (string, error) {
if c.Bool("xkcd") || c.IsSet("xkcdsep") {
return s.generatePasswordXKCD(ctx, c, length)
}
symbols := false
if c.Bool("symbols") || ctxutil.IsUseSymbols(ctx) {
symbols = true
}
var pwlen int
if length == "" {
candidateLength := defaultLength
question := "How long should the password be?"
iv, err := termio.AskForInt(ctx, question, candidateLength)
if err != nil {
return "", exitError(ctx, ExitUsage, err, "password length must be a number")
}
pwlen = iv
} else {
iv, err := strconv.Atoi(length)
if err != nil {
return "", exitError(ctx, ExitUsage, err, "password length must be a number")
}
pwlen = iv
}
if pwlen < 1 {
return "", exitError(ctx, ExitUsage, nil, "password length must not be zero")
}
return pwgen.GeneratePassword(pwlen, symbols), nil
}
func (s *Action) generatePasswordXKCD(ctx context.Context, c *cli.Context, length string) (string, error) {
xkcdSeparator := " "
if c.IsSet("xkcdsep") {
xkcdSeparator = c.String("xkcdsep")
}
var pwlen int
if length == "" {
candidateLength := defaultXKCDLength
question := "How many words should be combined to a password?"
iv, err := termio.AskForInt(ctx, question, candidateLength)
if err != nil {
return "", exitError(ctx, ExitUsage, err, "password length must be a number")
}
pwlen = iv
} else {
iv, err := strconv.Atoi(length)
if err != nil {
return "", exitError(ctx, ExitUsage, err, "password length must be a number: %s", err)
}
pwlen = iv
}
if pwlen < 1 {
return "", exitError(ctx, ExitUsage, nil, "password length must not be zero")
}
return xkcdgen.RandomLengthDelim(pwlen, xkcdSeparator, c.String("xkcdlang"))
}
func (s *Action) generateSetPassword(ctx context.Context, name, key, password string) error {
// set a single key in a yaml doc
if key != "" {
sec, err := s.Store.Get(ctx, name)
if err != nil {
return exitError(ctx, ExitEncrypt, err, "failed to set key '%s' of '%s': %s", key, name, err)
}
if err := sec.SetValue(key, password); err != nil {
return exitError(ctx, ExitEncrypt, err, "failed to set key '%s' of '%s': %s", key, name, err)
}
if err := s.Store.Set(sub.WithReason(ctx, "Generated password for YAML key"), name, sec); err != nil {
return exitError(ctx, ExitEncrypt, err, "failed to set key '%s' of '%s': %s", key, name, err)
}
return nil
}
// replace password in existing secret
if s.Store.Exists(ctx, name) {
sec, err := s.Store.Get(ctx, name)
if err != nil {
return exitError(ctx, ExitEncrypt, err, "failed to set key '%s' of '%s': %s", key, name, err)
}
sec.SetPassword(password)
if err := s.Store.Set(sub.WithReason(ctx, "Generated password for YAML key"), name, sec); err != nil {
return exitError(ctx, ExitEncrypt, err, "failed to set key '%s' of '%s': %s", key, name, err)
}
return nil
}
// generate a completely new secret
if err := s.Store.Set(sub.WithReason(ctx, "Generated Password"), name, secret.New(password, "")); err != nil {
return exitError(ctx, ExitEncrypt, err, "failed to create '%s': %s", name, err)
}
return nil
}