openssh unix dev - Feb 2002 - SSH Client Hangs after logging in to SSHD

I'm not a ssh expert and I don't know if the log is good or bad, but I
too am
running OpenSHH under OpenServer. I find that after I connect, the return key
has no effect unless I first type:

        stty sane <Ctrl>j

If you've hit <ENTER> before that you must first press <Ctrl>j a
couple of times
to clean out the buffer. After I type the above command, everything seems to
work ok. Interestingly when I connect from a Linux box using ssh I don't
seem to
need to do this.

I hope this helps.

Federico Coco wrote:
> Please,  I need your help
>
> My config.
> SCO V5.05
> OpenSSL V0.9.6b
> OpenSSH V2.9p2
>
> I start sshd in debugging mode, and this is what I see:
>
> debug2: Command 'last' timed out
> debug2: Command 'df' timed out
> debug2: Command 'vmstat' timed out
> debug1: Seeded RNG with 35 bytes from programs
> debug1: Seeded RNG with 3 bytes from system calls
> debug1: sshd version OpenSSH_2.9p2
> debug1: private host key: #0 type 0 RSA1
> debug1: read PEM private key done: type RSA
> debug1: private host key: #1 type 1 RSA
> debug1: read PEM private key done: type DSA
> debug1: private host key: #2 type 2 DSA
> debug1: Bind to port 22 on 0.0.0.0.
> Server listening on 0.0.0.0 port 22.
> Generating 768 bit RSA key.
> RSA key generation complete.
>
> After that I tried to connect from my ssh client, Putty, this is what I
see:
>
> debug1: Server will not fork when running in debugging mode.
> Connection from 192.168.10.5 port 1368
> debug1: Client protocol version 1.5; client software version PuTTY
> debug1: no match: PuTTY
> debug1: Local version string SSH-1.99-OpenSSH_2.9p2
> debug1: Rhosts Authentication disabled, originating port not trusted.
> debug1: Sent 768 bit server key and 1024 bit host key.
> debug1: Encryption type: 3des
> debug1: Received session key; encryption turned on.
>
> Now I have a login on the screen, so I will enter a user:
>
> Connection from 192.168.10.5 port 1368
> debug1: Client protocol version 1.5; client software version PuTTY
> debug1: no match: PuTTY
> debug1: Local version string SSH-1.99-OpenSSH_2.9p2
> debug1: Rhosts Authentication disabled, originating port not trusted.
> debug1: Sent 768 bit server key and 1024 bit host key.
> debug1: Encryption type: 3des
> debug1: Received session key; encryption turned on.
> debug1: Installing crc compensation attack detector.
> debug1: Attempting authentication for federico.
>
> Now I will enter the password:
>
> Accepted password for federico from 192.168.10.5 port 1368
> debug1: session_new: init
> debug1: session_new: session 0
> debug1: Allocating pty.
> debug1: Entering interactive session.
> debug1: fd 10 setting O_NONBLOCK
> debug1: fd 11 IS O_NONBLOCK
> debug1: server_init_dispatch_13
> debug1: server_init_dispatch_15
>
> After this I can see the prompt on the terminal, but everything is hanged,
I
> 'm not able to type anything.
>
> Then I close Putty:
>
> Read error from remote host: Connection reset by peer
> debug1: Calling cleanup 0x8056d2c(0x810f3c0)
> debug1: pty_cleanup_proc: /dev/ttyp13
> debug1: Calling cleanup 0x8067870(0x0)
> debug1: Calling cleanup 0x806ccac(0x0)
> debug1: writing PRNG seed to file file://.ssh/prng_seed
>
> I don't know what is going on.
> Can you give me any clues.
>
> TIA
>
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--

Regards

Frank S. Bernhardt
b.c.s.i.
14 Halton Court
Markham, ON.
L3P 6R3

905-471-1691 Voice
905-471-3016 FAX

frank at bcsi.ca



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"Frank S. Bernhardt" (frank at bcsi.ca) wrote:
>I'm not a ssh expert and I don't know if the log is good or bad, but
I too am
>running OpenSHH under OpenServer. I find that after I connect, the return
key
>has no effect unless I first type:
>
>        stty sane <Ctrl>j
>
>If you've hit <ENTER> before that you must first press
<Ctrl>j a couple of times
>to clean out the buffer. After I type the above command, everything seems to
>work ok. Interestingly when I connect from a Linux box using ssh I don't
seem to
>need to do this.
My experience on SCO OpenServer has been that pre2.9 versions of OpenSSH
had the above problem.  Connecting to a 2.9 or later sshd with a pre 2.9
ssh also had this problem.  Do you fall in this category?  I tested only
between OpenServer boxes, so can't comment on Linux or others.

Below is a patch to 3.0.2p1 session.c (sshd) which fixes the problem for
me.  Again, I've only tested between two OSR5 boxes.  I'd be interested
to know if it has any adverse affects on a linux (or other) box
connecting to an OSR5 one.

You'll need to either add -DSCO_OSR5 to --with-cflags when you run
configure, or just remove the SCO_OSR5 ifdefs from the patch after
applying it.

Roger


*** Orig/openssh-3.0.2p1/session.c	Sat Dec  1 18:37:08 2001
--- openssh-3.0.2p1/session.c	Wed Jan  2 14:49:06 2002
***************
*** 1622,1627 ****
--- 1622,1634 ----
  {
  	u_int len;
  	int n_bytes;
+ #ifdef SCO_OSR5
+ 	/*
+ 	 * needed only for compatibility w/pre 2.9 openssh versions which
+ 	 * connect to our sshd
+ 	 */
+ 	struct termios tio;
+ #endif /* SCO_OSR5 */
  
  	if (no_pty_flag) {
  		debug("Allocating a pty not permitted for this authentication.");
***************
*** 1679,1684 ****
--- 1686,1710 ----
  
  	packet_done();
  	session_proctitle(s);
+ 
+ #ifdef SCO_OSR5
+ 	/*
+ 	 * needed only for compatibility w/pre 2.9 openssh versions which
+ 	 * connect to our sshd
+ 	 */
+ 	if (tcgetattr(s->ptyfd, &tio) < 0)
+ 		log("Getting tty modes for pty failed: %.100s", strerror(errno));
+ 	else {
+ 		tio.c_lflag |= (ECHO | ISIG | ICANON);
+ 		tio.c_oflag |= (OPOST | ONLCR);
+ 		tio.c_iflag |= ICRNL;
+ 
+ 		/* Set the new modes for the terminal. */
+ 		if (tcsetattr(s->ptyfd, TCSANOW, &tio) < 0)
+ 			log("Setting tty modes for pty failed: %.100s", strerror(errno));
+ 	}
+ #endif /* SCO_OSR5 */
+ 
  	return 1;
  }
  

-- 
Roger Cornelius        rac at tenzing.org