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Log identifying information for the other end of connections.

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When anyone connects to a PuTTY tool's listening socket - whether it's
a user of a local->remote port forwarding, a connection-sharing
downstream or a client of Pageant - we'd like to log as much
information as we can find out about where the connection came from.

To that end, I've implemented a function sk_peer_info() in the socket
abstraction, which returns a freeform text string as best it can (or
NULL, if it can't get anything at all) describing the thing at the
other end of the connection. For TCP connections, this is done using
getpeername() to get an IP address and port in the obvious way; for
Unix-domain sockets, we attempt SO_PEERCRED (conditionalised on some
moderately hairy autoconfery) to get the pid and owner of the peer. I
haven't implemented anything for Windows named pipes, but I will if I
hear of anything useful.
This commit is contained in:
Simon Tatham
2015-05-18 13:57:45 +01:00
parent 63d7365ae6
commit c8f83979a3
17 changed files with 227 additions and 19 deletions
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19
portfwd.c
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@ -157,6 +157,21 @@ static int pfl_closing(Plug plug, const char *error_msg, int error_code,
return 1;
}
static void wrap_send_port_open(void *channel, const char *hostname, int port,
Socket s)
{
char *peerinfo, *description;
peerinfo = sk_peer_info(s);
if (peerinfo) {
description = dupprintf("forwarding from %s", peerinfo);
sfree(peerinfo);
} else {
description = dupstr("forwarding");
}
ssh_send_port_open(channel, hostname, port, description);
sfree(description);
}
static int pfd_receive(Plug plug, int urgent, char *data, int len)
{
struct PortForwarding *pf = (struct PortForwarding *) plug;
@ -371,7 +386,7 @@ static int pfd_receive(Plug plug, int urgent, char *data, int len)
return 1;
} else {
/* asks to forward to the specified host/port for this */
ssh_send_port_open(pf->c, pf->hostname, pf->port, "forwarding");
wrap_send_port_open(pf->c, pf->hostname, pf->port, pf->s);
}
pf->dynamic = 0;
@ -510,7 +525,7 @@ static int pfl_accepting(Plug p, accept_fn_t constructor, accept_ctx_t ctx)
return 1;
} else {
/* asks to forward to the specified host/port for this */
ssh_send_port_open(pf->c, pf->hostname, pf->port, "forwarding");
wrap_send_port_open(pf->c, pf->hostname, pf->port, s);
}
}