Vous pouvez reproduire cela en configurant la redirection de port dynamique SSH:
man ssh:
-D [bind_address:]port
Specifies a local “dynamic” application-level port forwarding. This works by allocating a socket
to listen to port on the local side, optionally bound to the specified bind_address. Whenever a
connection is made to this port, the connection is forwarded over the secure channel, and the
application protocol is then used to determine where to connect to from the remote machine. Cur‐
rently the SOCKS4 and SOCKS5 protocols are supported, and ssh will act as a SOCKS server. Only
root can forward privileged ports. Dynamic port forwardings can also be specified in the configu‐
ration file.
IPv6 addresses can be specified by enclosing the address in square brackets. Only the superuser
can forward privileged ports. By default, the local port is bound in accordance with the
GatewayPorts setting. However, an explicit bind_address may be used to bind the connection to a
specific address. The bind_address of “localhost” indicates that the listening port be bound for
local use only, while an empty address or ‘*’ indicates that the port should be available from all
interfaces.
Démarrez un proxy SOCKS sur localhost, port 2302:
$ ssh -v -ND 2302 user@host
Pour acheminer le trafic HTTP via ce tunnel, dans Firefox:
Édition -> Préférences -> Avancé -> onglet Réseau -> Paramètres -> Configuration manuelle du proxy -> Hôte SOCKS: localhost et Port: 2302
Afin d'utiliser le proxy SOCKS avec un autre trafic, vous pouvez utiliser un programme socksifier comme tsocks:
[I] net-proxy/tsocks
Available versions: 1.8_beta5-r3 ~1.8_beta5-r4 1.8_beta5-r5 ~1.8_beta5-r6 {tordns}
Installed versions: 1.8_beta5-r5(10:08:28 AM 06/15/2010)(-tordns)
Homepage: http://tsocks.sourceforge.net/
Description: Transparent SOCKS v4 proxying library
Sur mon Gentoo, éditez le /etc/socks/tsocks.confcomme ci-dessous:
# Otherwise we use the server
server = 127.0.0.1
server_port = 2302
Essai:
$ tsocks telnet 255.255.255.255 25
Vous verrez quelque chose comme ça sur le /var/log/secureserveur SSH:
sshd[28491]: error: connect_to 255.255.255.255 port 25: failed.
La partie que je ne comprends pas est qui essaie exactement de se connecter à ces adresses
Pour affiner, jetez un œil à /var/log/secure( auth.logsur votre distribution) et examinez qui s'est connecté avant cela:
sshd[26898]: pam_unix(sshd:session): session opened for user quanta
