79 lines
2.0 KiB
Go
79 lines
2.0 KiB
Go
package totp
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import (
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"time"
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"github.com/pquerna/otp"
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"github.com/pquerna/otp/totp"
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"github.com/authelia/authelia/v4/internal/configuration/schema"
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"github.com/authelia/authelia/v4/internal/models"
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)
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// NewTimeBasedProvider creates a new totp.TimeBased which implements the totp.Provider.
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func NewTimeBasedProvider(config *schema.TOTPConfiguration) (provider *TimeBased) {
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provider = &TimeBased{
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config: config,
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}
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if config.Skew != nil {
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provider.skew = *config.Skew
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} else {
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provider.skew = 1
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}
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return provider
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}
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// TimeBased totp.Provider for production use.
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type TimeBased struct {
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config *schema.TOTPConfiguration
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skew uint
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}
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// GenerateCustom generates a TOTP with custom options.
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func (p TimeBased) GenerateCustom(username, algorithm string, digits, period, secretSize uint) (config *models.TOTPConfiguration, err error) {
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var key *otp.Key
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opts := totp.GenerateOpts{
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Issuer: p.config.Issuer,
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AccountName: username,
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Period: period,
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SecretSize: secretSize,
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Digits: otp.Digits(digits),
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Algorithm: otpStringToAlgo(algorithm),
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}
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if key, err = totp.Generate(opts); err != nil {
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return nil, err
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}
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config = &models.TOTPConfiguration{
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Username: username,
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Issuer: p.config.Issuer,
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Algorithm: algorithm,
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Digits: digits,
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Secret: []byte(key.Secret()),
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Period: period,
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}
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return config, nil
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}
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// Generate generates a TOTP with default options.
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func (p TimeBased) Generate(username string) (config *models.TOTPConfiguration, err error) {
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return p.GenerateCustom(username, p.config.Algorithm, p.config.Digits, p.config.Period, 32)
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}
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// Validate the token against the given configuration.
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func (p TimeBased) Validate(token string, config *models.TOTPConfiguration) (valid bool, err error) {
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opts := totp.ValidateOpts{
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Period: config.Period,
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Skew: p.skew,
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Digits: otp.Digits(config.Digits),
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Algorithm: otpStringToAlgo(config.Algorithm),
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}
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return totp.ValidateCustom(token, string(config.Secret), time.Now().UTC(), opts)
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}
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