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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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3
ssh.h
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@ -44,7 +44,8 @@ void ssh_sharing_remove_x11_display(Ssh ssh, struct X11FakeAuth *auth);
void ssh_send_packet_from_downstream(Ssh ssh, unsigned id, int type,
const void *pkt, int pktlen,
const char *additional_log_text);
void ssh_sharing_downstream_connected(Ssh ssh, unsigned id);
void ssh_sharing_downstream_connected(Ssh ssh, unsigned id,
const char *peerinfo);
void ssh_sharing_downstream_disconnected(Ssh ssh, unsigned id);
void ssh_sharing_logf(Ssh ssh, unsigned id, const char *logfmt, ...);
int ssh_agent_forwarding_permitted(Ssh ssh);