ratelimit: Increase ratelimit to avoid failing handshakes

Regarding #171

Author: shazow

sshd/ratelimit.go

@@ -44,8 +44,8 @@ type inputLimiter struct {
 func NewInputLimiter() rateio.Limiter {
 	grace := time.Second * 3
 	return &inputLimiter{
-		Amount:    200 * 4 * 2, // Assume fairly high typing rate + margin for copypasta of links.
-		Frequency: time.Minute * 2,
+		Amount:    200 * 4 * 5, // Assume fairly high typing rate + margin for copypasta of links + large key handshakes
+		Frequency: time.Minute * 1,
 		readCap:   128,          // Allow up to 128 bytes per read (anecdotally, 1 character = 52 bytes over ssh)
 		numRead:   -1024 * 1024, // Start with a 1mb grace
 		timeRead:  time.Now().Add(grace),