57 lines
1.8 KiB
Go
57 lines
1.8 KiB
Go
package turn
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import ( //nolint:gci
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"crypto/hmac"
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"crypto/sha1" //nolint:gosec,gci
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"encoding/base64"
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"net"
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"strconv"
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"time"
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"github.com/pion/logging"
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)
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// GenerateLongTermCredentials can be used to create credentials valid for [duration] time
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func GenerateLongTermCredentials(sharedSecret string, duration time.Duration) (string, string, error) {
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t := time.Now().Add(duration).Unix()
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username := strconv.FormatInt(t, 10)
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password, err := longTermCredentials(username, sharedSecret)
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return username, password, err
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}
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func longTermCredentials(username string, sharedSecret string) (string, error) {
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mac := hmac.New(sha1.New, []byte(sharedSecret))
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_, err := mac.Write([]byte(username))
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if err != nil {
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return "", err // Not sure if this will ever happen
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}
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password := mac.Sum(nil)
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return base64.StdEncoding.EncodeToString(password), nil
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}
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// NewLongTermAuthHandler returns a turn.AuthAuthHandler used with Long Term (or Time Windowed) Credentials.
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// https://tools.ietf.org/search/rfc5389#section-10.2
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func NewLongTermAuthHandler(sharedSecret string, l logging.LeveledLogger) AuthHandler {
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if l == nil {
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l = logging.NewDefaultLoggerFactory().NewLogger("turn")
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}
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return func(username, realm string, srcAddr net.Addr) (key []byte, ok bool) {
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l.Tracef("Authentication username=%q realm=%q srcAddr=%v\n", username, realm, srcAddr)
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t, err := strconv.Atoi(username)
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if err != nil {
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l.Errorf("Invalid time-windowed username %q", username)
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return nil, false
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}
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if int64(t) < time.Now().Unix() {
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l.Errorf("Expired time-windowed username %q", username)
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return nil, false
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}
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password, err := longTermCredentials(username, sharedSecret)
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if err != nil {
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l.Error(err.Error())
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return nil, false
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}
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return GenerateAuthKey(username, realm, password), true
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}
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}
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