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psyced/world/net/spyc/circuit.c
2009-03-04 00:40:26 +01:00

318 lines
9 KiB
C

// vim:foldmethod=marker:syntax=lpc:noexpandtab
// $Id: circuit.c,v 1.38 2008/10/14 19:02:29 lynx Exp $
#include "psyc.h"
#include <net.h>
#include <uniform.h>
#include <tls.h>
#include <text.h>
inherit NET_PATH "trust";
inherit NET_PATH "spyc/parse";
virtual inherit NET_PATH "output";
volatile string peerhost;
volatile string peeraddr;
volatile string peerip;
volatile int peerport;
volatile string netloc;
#ifndef NEW_RENDER
# define NEW_RENDER
#endif
#include "edit.i"
// this is completely anti-psyc. it should take mcs as arguments
// and look up the actual message from textdb.. FIXME
#define CIRCUITERROR(reason) { debug_message("SPYC CIRCUIT: " reason "\n"); \
croak("_error_circuit", "circuit error: " \
reason); \
return 0; \
}
mapping instate;
mapping outstate;
mapping legal_senders;
volatile int flags = 0;
void circuit_msg(string mc, mapping vars, string data); // prototype
varargs int msg(string source, string mc, string data,
mapping vars, int showingLog, mixed target); // prototype
protected void quit(); // prototype
void runQ();
int isServer() { return 0; }
void feed(string data) {
input_to(#'feed, INPUT_IGNORE_BANG);
::feed(data);
}
// yes, this is a funny implementation of croak
// it does not use msg(). Yes, that is intended
varargs mixed croak(string mc, string data, vamapping vars, vamixed source) {
binary_message(sprintf("\n%s\n%s\n|\n", mc, data));
remove_interactive(ME);
destruct(ME);
return 0;
}
#ifdef USE_VERIFICATION
// request sender authentication and/or target acknowledgement
// from the remote side
void sender_verification(array(string) sourcehosts, array(string) targethosts)
{
// FIXME: wrong variables here
mapping vars = ([ "_list_sources_hosts" : sourcehosts,
"_list_targets_hosts" : targethosts,
"_tag" : RANDHEXSTRING ]);
// assumption: we have already resolved all targethosts and
// they point to the remote ip
foreach(string ho : targethosts) {
sAuthenticated(ho);
}
msg(0, "_request_verification", 0, vars);
}
#endif
// gets called during socket logon
int logon(int failure) {
sAuthHosts(([ ])); // reset authhosts
legal_senders = ([ ]);
instate = ([ "_INTERNAL_origin" : ME]);
outstate = ([ ]);
#ifdef __TLS__
mixed cert;
if (tls_available() && tls_query_connection_state(ME) == 1 && mappingp(cert = tls_certificate(ME, 0))) {
mixed m, t;
if (cert[0] != 0) {
// log error 17 + cert here
// and goodbye.
P0(("%O encountered a cert verify error %O in %O\n", ME,
cert[0], cert))
remove_interactive(ME);
return 0;
}
if (m = cert["2.5.29.17:dNSName"]) {
// FIXME: this does not yet handle wildcard DNS names
P1(("%O believing dNSName %O\n", ME, m))
// probably also: register_target?
// but be careful never to register_target wildcards
if (stringp(m))
sAuthenticated(NAMEPREP(m));
else
foreach(t : m)
sAuthenticated(NAMEPREP(t));
}
//#ifdef _flag_allow_certificate_name_common // to be switched this year
#ifndef _flag_disallow_certificate_name_common
// assume that CN is a host
// as this is an assumption only, we may NEVER register_target it
// note: CN is deprecated for good reasons.
else if (t = cert["2.5.4.3"]) {
P1(("%O believing CN %O\n", ME, t))
sAuthenticated(NAMEPREP(t));
}
#endif
if (m = tls_query_connection_info(ME)) {
P2(("%O is using the %O cipher.\n", ME, m[TLS_CIPHER]))
// shouldn't our negotiation have ensured we have PFS?
if (stringp(t = m[TLS_CIPHER]) &&! abbrev("DHE", t)) {
// croak("_warning_circuit_encryption_cipher",
// "Your cipher choice does not provide forward secrecy.");
monitor_report(
"_warning_circuit_encryption_cipher_details",
object_name(ME) +" · using "+ t +" cipher");
//debug_message(sprintf(
// "TLS connection info for %O is %O\n", ME, m));
//QUIT // are we ready for *this* !???
}
}
}
#endif
peerip = query_ip_number(ME) || "127.0.0.1";
#if __EFUN_DEFINED__(enable_binary)
enable_binary(ME);
#else
# echo Driver compiled without enable_binary() - PSYC functionality warning!
#endif
input_to(#'feed, INPUT_IGNORE_BANG);
call_out(#'quit, 90);
flags = TCP_PENDING_TIMEOUT;
parser_init();
// FIXME
unless(isServer()) {
emit("|\n"); // initial greeting
#ifdef USE_FEATURES
// we have no features to request or offer
msg(0, "_request_features", 0);
#else
# ifdef USE_VERIFICATION
// start hostname verification
// rather: look at Q and look for the hostnames we need
sender_verification(({ SERVER_HOST }), ({ peerhost }));
# else
if (function_exists("runQ")) {
runQ();
}
# endif
#endif
}
return 1;
}
int disconnected(string remaining) {
// i love to copy+paste source codes! thx for NOT sharing.. grrr
#if DEBUG > 0
if (remaining && (!stringp(remaining) || strlen(remaining)))
PP(("%O ignoring remaining data from socket: %O\n", ME,
remaining));
#endif
// wow.. a sincerely expected disconnect!
if (flags & TCP_PENDING_DISCONNECT) return 1;
monitor_report("_failure_network_circuit_disconnect",
object_name(ME) +" · lost PSYC circuit");
return 0; // unexpected
}
// respond to the first empty packet
first_response() {
emit("|\n");
}
// processes routing header variable assignments
// basic version does no state
mapping process_header(mixed varops) {
mapping vars = ([ ]);
foreach(mixed vop : varops) {
string vname = vop[0];
switch(vop[1]) {
case C_GLYPH_MODIFIER_ASSIGN:
instate[vname] = vop[2];
// fall thru
case C_GLYPH_MODIFIER_SET:
vars[vname] = vop[2];
break;
case C_GLYPH_MODIFIER_AUGMENT:
case C_GLYPH_MODIFIER_DIMINISH:
case C_GLYPH_MODIFIER_QUERY:
CIRCUITERROR("header modifier with glyph other than ':', this is not implemented")
break;
default:
CIRCUITERROR("header modifier with unknown glyph")
break;
}
// FIXME: not every legal varname is a mmp varname
// look at shared_memory("routing")
if (!legal_keyword(vname) || abbrev("_INTERNAL", vname)) {
CIRCUITERROR("illegal varname in header")
}
}
return vars;
}
#define PSYC_TCP
#include "dispatch.i"
// receives a msg from the remote side
// note: this is circuit-messaging
void circuit_msg(string mc, mapping vars, string data) {
switch(mc) {
case "_request_verification":
if (tls_query_connection_state(ME) == 0) {
array(string) targethosts = ({ });
foreach(string ho : vars["_list_targets_hosts"]) {
if (is_localhost(ho)) {
targethosts += ({ ho });
}
}
if (sizeof(vars["_list_sources_hosts"]) == 1) {
// doing multiple resolutions in parallel is more complicated
string ho = vars["_list_sources_hosts"][0];
if (qAuthenticated(ho)) {
P0(("warning: trying to reverify authenticated host %O",ho))
} else {
dns_resolve(ho, (:
// FIXME: psyc/parse::deliver is much better here
mixed rv = (["_list_targets_accepted_hosts":targethosts]);
if (vars["_tag"]) rv["_tag_reply"] = vars["_tag"];
if ($1 == peerip) {
sAuthenticated(NAMEPREP(ho));
rv["_list_sources_verified_hosts"] = ({ ho });
} else {
rv["_list_sources_rejected_hosts"] = ({ ho });
}
msg(0, "_notice_verification", 0, rv);
return;
:));
}
} else {
// FIXME!!!!
CIRCUITERROR("sorry, no more than one element in _list_sources_hosts currently");
P0(("more than one element in _list_sources_hosts: %O\n", vars["_list_sources_hosts"]))
}
// keep tag if present!!!
// resolve all of _list_sources_hosts
// look at _list_targets_hosts and determine localhostiness
} else {
CIRCUITERROR("_request_verification is not allowed on TLS circuits.");
}
break;
case "_notice_features":
// FIXME: watch for _list_using_modules
if (flags & TCP_PENDING_TIMEOUT) {
P0(("removing call out\n"))
remove_call_out(#'quit);
flags -= TCP_PENDING_TIMEOUT;
}
sTextPath();
#ifdef USE_FEATURES
if (tls_query_connection_state(ME) == 0) {
# ifdef USE_VERIFICATION
// start hostname verification
// rather: look at Q and look for the hostnames we need
sender_verification(({ SERVER_HOST }), ({ peerhost }));
# endif
} else {
if (function_exists("runQ")) {
runQ();
}
}
#endif
break;
case "_notice_verification":
P0(("_notice verification with %O\n", vars))
if (function_exists("runQ")) {
runQ();
}
break;
default:
P0(("%O got circuit_msg %O, not implemented\n", ME, mc))
break;
}
}
// delivers a message to the remote side
varargs int msg(string source, string mc, string data,
mapping vars, int showingLog, mixed target) {
string buf = "";
unless(vars) vars = ([ ]);
buf = psyc_render(source, mc, data, vars, showingLog, target);
#ifdef _flag_log_sockets_SPYC
log_file("RAW_SPYC", "« %O\n%s\n", ME, buf);
#endif
return emit(buf);
}