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ssh: add "none" method to find out list of acceptable methods

--- a/sys/src/cmd/ssh.c

+++ b/sys/src/cmd/ssh.c

@@ -673,6 +673,32 @@

 }

 int

+noneauth(void)

+{

+	static char authmeth[] = "none";

+

+	if(!authok(authmeth))

+		return -1;

+

+	sendpkt("bsss", MSG_USERAUTH_REQUEST,

+		user, strlen(user),

+		service, strlen(service),

+		authmeth, sizeof(authmeth)-1);

+

+Next0:	switch(recvpkt()){

+	default:

+		dispatch();

+		goto Next0;

+	case MSG_USERAUTH_FAILURE:

+		werrstr("authentication needed");

+		authfailure(authmeth);

+		return -1;

+	case MSG_USERAUTH_SUCCESS:

+		return 0;

+	}

+}

+

+int

 pubkeyauth(void)

 {

 	static char authmeth[] = "publickey";

@@ -1171,7 +1197,7 @@

 		break;

 	}

-	if(pubkeyauth() < 0 && passauth() < 0 && kbintauth() < 0)

+	if(noneauth() < 0 && pubkeyauth() < 0 && passauth() < 0 && kbintauth() < 0)

 		sysfatal("auth: %r");

 	recv.pkt = MaxPacket;