SSH et stunnel

Bonjour,

J'ai un petit souci récent que je n'arrive pas à m'expliquer. En effet,
j'ai mis en place un tunnel (avec stunnel) entre deux ordinateurs (tous
les deux en Debian Sid).

Voici la config côté client :
pid = /var/run/stunnel.pid
client = yes
sslVersion = TLSv1.2
debug = 7
[ssh]
accept = 5000
protocol = connect
protocolHost = myserver:443
connect = myproxy:8080

Et côté serveur :
cert = mycert
key = mykey
chroot = /var/lib/stunnel4/
setuid = stunnel4
setgid = stunnel4
pid = /stunnel4.pid
socket = l:TCP_NODELAY=1
socket = r:TCP_NODELAY=1
sslVersion = TLSv1.2
; https ou ssh encapsulé dans du ssl
[sslh]
accept = 443
connect = myserver:444

Ainsi que mon .ssh/config :
Host myserver
HostName localhost
Port 5000
IdentityFile ~/.ssh/mykey
ProtocolKeepAlives 6

Chez moi, avec tinyproxy pour tester, tout marche parfaitement ! En
revanche, avec un "vrai" proxy, parfois ça marche (mais je suis
rapidement déconnecté), parfois ça ne marche pas (le plus souvent
d'ailleurs).
J'ai regardé les logs (stunnel et SSH), mais je n'ai rien trouvé de
flagrant...

Auriez-vous une idée ? Quelque chose à chercher dans les logs ?

Voici un exemple de connexion courte :
~ $ ssh myserver
root@myserver:~# cat /var/log/syslog | grep stunnel
[...]
root@myserver~# Timeout, server localhost not responding.

Mais le plus souvent :
~ $ ssh myserver
ssh_exchange_identification: Connection closed by remote host

Et voici mes logs locaux :
Mar 12 13:24:41 mylaptop stunnel: LOG7[3984]: Service [ssh] accepted
(FD=3) from 127.0.0.1:44794
Mar 12 13:24:41 mylaptop stunnel: LOG7[3223]: Service [ssh] started
Mar 12 13:24:41 mylaptop stunnel: LOG5[3223]: Service [ssh] accepted
connection from 127.0.0.1:44794
Mar 12 13:24:41 mylaptop stunnel: LOG6[3223]: s_connect: connecting
myproxy:8080
Mar 12 13:24:41 mylaptop stunnel: LOG7[3223]: s_connect: s_poll_wait
myproxy:8080: waiting 10 seconds
Mar 12 13:24:41 mylaptop stunnel: LOG5[3223]: s_connect: connected
myproxy:8080
Mar 12 13:24:41 mylaptop stunnel: LOG5[3223]: Service [ssh] connected
remote server from myIP:58282
Mar 12 13:24:41 mylaptop stunnel: LOG7[3223]: Remote socket (FD=8)
initialized
Mar 12 13:24:41 mylaptop stunnel: LOG7[3223]: -> CONNECT myserver:443
HTTP/1.1
Mar 12 13:24:41 mylaptop stunnel: LOG7[3223]: -> Host: myserver:443
Mar 12 13:24:41 mylaptop stunnel: LOG7[3223]: ->
Mar 12 13:24:41 mylaptop stunnel: LOG7[3223]: <- HTTP/1.1 200
Connection established
Mar 12 13:24:41 mylaptop stunnel: LOG6[3223]: CONNECT request accepted
Mar 12 13:24:41 mylaptop stunnel: LOG7[3223]: <-
Mar 12 13:24:41 mylaptop stunnel: LOG6[3223]: SNI: sending servername:
myserver
Mar 12 13:24:41 mylaptop stunnel: LOG7[3223]: SSL state (connect):
before/connect initialization
Mar 12 13:24:41 mylaptop stunnel: LOG7[3223]: SSL state (connect):
unknown state
Mar 12 13:24:41 mylaptop stunnel: LOG7[3223]: SSL state (connect):
unknown state
Mar 12 13:24:41 mylaptop stunnel: LOG7[3223]: SSL state (connect):
unknown state
Mar 12 13:24:41 mylaptop stunnel: LOG7[3223]: SSL state (connect):
unknown state
Mar 12 13:24:41 mylaptop stunnel: LOG7[3223]: SSL state (connect):
unknown state
Mar 12 13:24:41 mylaptop stunnel: LOG7[3223]: SSL state (connect):
unknown state
Mar 12 13:24:41 mylaptop stunnel: LOG7[3223]: 54 items in the session
cache
Mar 12 13:24:41 mylaptop stunnel: LOG7[3223]: 109 client connects
(SSL_connect())
Mar 12 13:24:41 mylaptop stunnel: LOG7[3223]: 110 client connects that
finished
Mar 12 13:24:41 mylaptop stunnel: LOG7[3223]: 0 client renegotiations
requested
Mar 12 13:24:41 mylaptop stunnel: LOG7[3223]: 0 server connects
(SSL_accept())
Mar 12 13:24:41 mylaptop stunnel: LOG7[3223]: 0 server connects that
finished
Mar 12 13:24:41 mylaptop stunnel: LOG7[3223]: 0 server renegotiations
requested
Mar 12 13:24:41 mylaptop stunnel: LOG7[3223]: 56 session cache hits
Mar 12 13:24:41 mylaptop stunnel: LOG7[3223]: 0 external session
cache hits
Mar 12 13:24:41 mylaptop stunnel: LOG7[3223]: 0 session cache misses
Mar 12 13:24:43 mylaptop stunnel: LOG7[3223]: SSL alert (read): warning:
close notify
Mar 12 13:24:43 mylaptop stunnel: LOG6[3223]: SSL closed (SSL_read)
Mar 12 13:24:43 mylaptop stunnel: LOG7[3223]: Sent socket write shutdown
Mar 12 13:24:43 mylaptop stunnel: LOG6[3223]: Read socket closed
(readsocket)
Mar 12 13:24:43 mylaptop stunnel: LOG6[3223]: Read socket closed
(hangup)
Mar 12 13:24:43 mylaptop stunnel: LOG6[3223]: Write socket closed
(hangup)
Mar 12 13:24:43 mylaptop stunnel: LOG7[3223]: Sending close_notify alert
Mar 12 13:24:43 mylaptop stunnel: LOG7[3223]: SSL alert (write):
warning: close notify
Mar 12 13:24:43 mylaptop stunnel: LOG6[3223]: SSL_shutdown successfully
sent close_notify alert
Mar 12 13:24:43 mylaptop stunnel: LOG5[3223]: Connection closed: 32
byte(s) sent to SSL, 0 byte(s) sent to socket
Mar 12 13:24:43 mylaptop stunnel: LOG7[3223]: Remote socket (FD=8)
closed
Mar 12 13:24:43 mylaptop stunnel: LOG7[3223]: Local socket (FD=3) closed
Mar 12 13:24:43 mylaptop stunnel: LOG7[3223]: Service [ssh] finished (0
left)

Merci d'avance.

David.

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