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207 lines
5.6 KiB
Go
Vendored
207 lines
5.6 KiB
Go
Vendored
/**
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* Copyright 2014 Paul Querna
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package totp
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import (
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"github.com/pquerna/otp"
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"github.com/pquerna/otp/hotp"
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"io"
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"crypto/rand"
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"encoding/base32"
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"math"
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"net/url"
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"strconv"
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"time"
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)
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// Validate a TOTP using the current time.
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// A shortcut for ValidateCustom, Validate uses a configuration
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// that is compatible with Google-Authenticator and most clients.
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func Validate(passcode string, secret string) bool {
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rv, _ := ValidateCustom(
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passcode,
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secret,
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time.Now().UTC(),
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ValidateOpts{
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Period: 30,
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Skew: 1,
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Digits: otp.DigitsSix,
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Algorithm: otp.AlgorithmSHA1,
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},
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)
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return rv
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}
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// GenerateCode creates a TOTP token using the current time.
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// A shortcut for GenerateCodeCustom, GenerateCode uses a configuration
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// that is compatible with Google-Authenticator and most clients.
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func GenerateCode(secret string, t time.Time) (string, error) {
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return GenerateCodeCustom(secret, t, ValidateOpts{
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Period: 30,
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Skew: 1,
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Digits: otp.DigitsSix,
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Algorithm: otp.AlgorithmSHA1,
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})
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}
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// ValidateOpts provides options for ValidateCustom().
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type ValidateOpts struct {
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// Number of seconds a TOTP hash is valid for. Defaults to 30 seconds.
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Period uint
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// Periods before or after the current time to allow. Value of 1 allows up to Period
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// of either side of the specified time. Defaults to 0 allowed skews. Values greater
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// than 1 are likely sketchy.
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Skew uint
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// Digits as part of the input. Defaults to 6.
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Digits otp.Digits
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// Algorithm to use for HMAC. Defaults to SHA1.
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Algorithm otp.Algorithm
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}
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// GenerateCodeCustom takes a timepoint and produces a passcode using a
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// secret and the provided opts. (Under the hood, this is making an adapted
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// call to hotp.GenerateCodeCustom)
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func GenerateCodeCustom(secret string, t time.Time, opts ValidateOpts) (passcode string, err error) {
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if opts.Period == 0 {
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opts.Period = 30
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}
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counter := uint64(math.Floor(float64(t.Unix()) / float64(opts.Period)))
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passcode, err = hotp.GenerateCodeCustom(secret, counter, hotp.ValidateOpts{
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Digits: opts.Digits,
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Algorithm: opts.Algorithm,
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})
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if err != nil {
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return "", err
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}
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return passcode, nil
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}
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// ValidateCustom validates a TOTP given a user specified time and custom options.
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// Most users should use Validate() to provide an interpolatable TOTP experience.
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func ValidateCustom(passcode string, secret string, t time.Time, opts ValidateOpts) (bool, error) {
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if opts.Period == 0 {
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opts.Period = 30
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}
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counters := []uint64{}
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counter := int64(math.Floor(float64(t.Unix()) / float64(opts.Period)))
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counters = append(counters, uint64(counter))
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for i := 1; i <= int(opts.Skew); i++ {
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counters = append(counters, uint64(counter+int64(i)))
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counters = append(counters, uint64(counter-int64(i)))
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}
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for _, counter := range counters {
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rv, err := hotp.ValidateCustom(passcode, counter, secret, hotp.ValidateOpts{
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Digits: opts.Digits,
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Algorithm: opts.Algorithm,
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})
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if err != nil {
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return false, err
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}
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if rv == true {
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return true, nil
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}
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}
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return false, nil
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}
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// GenerateOpts provides options for Generate(). The default values
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// are compatible with Google-Authenticator.
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type GenerateOpts struct {
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// Name of the issuing Organization/Company.
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Issuer string
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// Name of the User's Account (eg, email address)
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AccountName string
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// Number of seconds a TOTP hash is valid for. Defaults to 30 seconds.
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Period uint
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// Size in size of the generated Secret. Defaults to 20 bytes.
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SecretSize uint
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// Secret to store. Defaults to a randomly generated secret of SecretSize. You should generally leave this empty.
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Secret []byte
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// Digits to request. Defaults to 6.
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Digits otp.Digits
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// Algorithm to use for HMAC. Defaults to SHA1.
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Algorithm otp.Algorithm
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// Reader to use for generating TOTP Key.
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Rand io.Reader
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}
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var b32NoPadding = base32.StdEncoding.WithPadding(base32.NoPadding)
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// Generate a new TOTP Key.
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func Generate(opts GenerateOpts) (*otp.Key, error) {
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// url encode the Issuer/AccountName
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if opts.Issuer == "" {
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return nil, otp.ErrGenerateMissingIssuer
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}
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if opts.AccountName == "" {
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return nil, otp.ErrGenerateMissingAccountName
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}
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if opts.Period == 0 {
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opts.Period = 30
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}
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if opts.SecretSize == 0 {
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opts.SecretSize = 20
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}
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if opts.Digits == 0 {
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opts.Digits = otp.DigitsSix
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}
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if opts.Rand == nil {
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opts.Rand = rand.Reader
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}
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// otpauth://totp/Example:alice@google.com?secret=JBSWY3DPEHPK3PXP&issuer=Example
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v := url.Values{}
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if len(opts.Secret) != 0 {
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v.Set("secret", b32NoPadding.EncodeToString(opts.Secret))
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} else {
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secret := make([]byte, opts.SecretSize)
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_, err := opts.Rand.Read(secret)
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if err != nil {
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return nil, err
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}
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v.Set("secret", b32NoPadding.EncodeToString(secret))
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}
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v.Set("issuer", opts.Issuer)
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v.Set("period", strconv.FormatUint(uint64(opts.Period), 10))
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v.Set("algorithm", opts.Algorithm.String())
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v.Set("digits", opts.Digits.String())
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u := url.URL{
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Scheme: "otpauth",
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Host: "totp",
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Path: "/" + opts.Issuer + ":" + opts.AccountName,
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RawQuery: v.Encode(),
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}
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return otp.NewKeyFromURL(u.String())
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}
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