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|
package otp
import (
"fmt"
"io/ioutil"
"net/url"
"os"
"strconv"
"strings"
"time"
"github.com/pkg/errors"
"github.com/pquerna/otp"
"github.com/pquerna/otp/totp"
"github.com/smallstep/cli/errs"
"github.com/smallstep/cli/flags"
"github.com/smallstep/cli/utils"
"github.com/urfave/cli"
)
func verifyCommand() cli.Command {
return cli.Command{
Name: "verify",
Action: cli.ActionFunc(verifyAction),
Usage: "verify a one-time password",
UsageText: `**step crypto otp verify** [**--secret**=<path>]
[**--period**=<seconds>] [**--skew**=<num>] [**--length**=<size>]
[**--alg**=<alg>] [*--time**=<time|duration>]`,
Description: `**step crypto otp verify** does TOTP and HTOP`,
Flags: []cli.Flag{
cli.StringFlag{
Name: "secret",
Usage: `Path to file containing TOTP secret.`,
},
cli.UintFlag{
Name: "period",
Usage: `Number of seconds a TOTP hash is valid. Defaults to 30
seconds.`,
Value: 30,
},
cli.UintFlag{
Name: "skew",
Usage: `Periods before or after current time to allow. Defaults
to 0. Values greater than 1 require '--insecure' flag.`,
Value: 0,
},
cli.IntFlag{
Name: "length, digits",
Usage: `Length of one-time passwords. Defaults to 6 digits.`,
Value: 6,
},
cli.StringFlag{
Name: "alg, algorithm",
Usage: `Algorithm to use for HMAC. Defaults to SHA1. Must be
one of: SHA1, SHA256, SHA512`,
Value: "SHA1",
},
cli.StringFlag{
Name: "time",
Usage: `The <time|duration> to use for TOTP validation. If a <time> is
used it is expected to be in RFC 3339 format. If a <duration> is used, it is a
sequence of decimal numbers, each with optional fraction and a unit suffix, such
as "300ms", "-1.5h" or "2h45m". Valid time units are "ns", "us" (or "µs"), "ms",
"s", "m", "h". A <duration> value is added to the current time. An empty
<time|duration> defaults to "time.Now()".`,
},
cli.BoolFlag{
Name: "insecure",
Hidden: true,
},
},
}
}
func verifyAction(ctx *cli.Context) error {
var (
secret string
// defaults
period = uint(30)
digits = 6
algStr = "SHA1"
)
secretFile := ctx.String("secret")
if len(secretFile) == 0 {
args := ctx.Args()
if len(args) == 0 {
return errs.RequiredFlag(ctx, "secret")
}
secretFile = args[0]
}
b, err := ioutil.ReadFile(secretFile)
if err != nil {
return errs.FileError(err, secretFile)
}
secret = string(b)
if strings.HasPrefix(secret, "otpauth://") {
otpKey, err := otp.NewKeyFromURL(secret)
if err != nil {
return errors.Wrap(err, "error parsing TOTP key from URL")
}
u, err := url.Parse(strings.TrimSpace(secret))
if err != nil {
return errors.Wrap(err, "error parsing TOTP Key URI in secret file")
}
q := u.Query()
secret = otpKey.Secret()
// period query param
if periodStr := q.Get("period"); len(periodStr) > 0 {
period64, err := strconv.ParseUint(periodStr, 10, 0)
if err != nil {
return errors.Wrap(err, "error parsing period from url")
}
period = uint(period64)
}
// digits query param
if digitStr := q.Get("digits"); len(digitStr) > 0 {
digits64, err := strconv.ParseInt(digitStr, 10, 0)
if err != nil {
return errors.Wrap(err, "error parsing period from url")
}
digits = int(digits64)
}
// algorithm query param
algFromQuery := q.Get("algorithm")
if len(algFromQuery) > 0 {
algStr = algFromQuery
}
}
if ctx.IsSet("period") {
period = ctx.Uint("period")
}
if ctx.IsSet("digits") {
digits = ctx.Int("digits")
}
if ctx.IsSet("alg") {
algStr = ctx.String("alg")
}
alg, err := algFromString(ctx, algStr)
if err != nil {
return err
}
var (
ok bool
selectTime time.Time
)
if ctx.String("time") == "" {
selectTime = time.Now()
} else {
selectTime, ok = flags.ParseTimeOrDuration(ctx.String("time"))
if !ok {
return errs.InvalidFlagValue(ctx, "time", ctx.String("time"), "")
}
}
skew := ctx.Uint("skew")
if skew > 1 && !ctx.Bool("insecure") {
return errors.Errorf("'--skew' values greater than 1 require the '--insecure' flag")
}
passcode, err := utils.ReadInput("Enter Passcode")
if err != nil {
return errors.Wrap(err, "error reading passcode")
}
valid, err := totp.ValidateCustom(string(passcode), secret, selectTime, totp.ValidateOpts{
Period: period,
Skew: skew,
Digits: otp.Digits(digits),
Algorithm: alg,
})
if err != nil {
return errors.Wrap(err, "error while validating TOTP")
} else if valid {
fmt.Println("ok")
os.Exit(0)
} else {
fmt.Println("fail")
os.Exit(1)
}
return nil
}
|
