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