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git://git.psyced.org/git/psyced
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625 lines
19 KiB
C
625 lines
19 KiB
C
// $Id: gateway.c,v 1.461 2008/10/22 16:35:59 fippo Exp $ // vim:syntax=lpc
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/*
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* jabber/gateway
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* listens on jabber interserver port for incoming connections
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*
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*/
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#define NO_INHERIT
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#include "jabber.h" // inherits net/jabber/common
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#undef NO_INHERIT
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#include "uniform.h"
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#include "services.h"
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#define NO_INHERIT
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#include "server.h" // does not inherit net/server
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#undef NO_INHERIT
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//virtual inherit NET_PATH "output";
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inherit NET_PATH "trust";
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inherit NET_PATH "jabber/mixin_parse";
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#ifdef XMPP_BIDI
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inherit NET_PATH "jabber/mixin_render";
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#endif
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//inherit NET_PATH "storage";
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volatile object active; // currently unused, but you could send w() to it
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#include "interserver.c" // interserver stuff
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/* major pre-mammas-birthday-todo:
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* replace usage of sendmsg() by usage of tell/placerequest
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* sendmsg should not be used directly!
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*/
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/* some notes about _error_unknown_name_user:
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* those should probably be _error_unknown_name if source of the error
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* does not have a node identifier (for example a bare server jid)
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*/
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volatile string host; // about time to remember which host we are talking to
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volatile string tag;
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volatile string streamid;
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volatile string streamfrom;
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volatile string resource;
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volatile mapping certinfo;
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v(a, b) {
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PT(("%O v(%O, %O)\n", ME, a, b))
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return "";
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}
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load(ho, po) { host = ho; return ME; }
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// this is not called by driver. this is called by call_out.
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quit() {
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flags |= TCP_PENDING_DISCONNECT;
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remove_interactive(ME);
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}
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disconnected(remainder) {
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// TODO: handle remainder
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P2(( "gateway %O disconnected\n", ME ))
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// sometimes we get complete presence packets in the socket close
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// remainder. probably broken xmpp implementations, let's try and
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// do the best we can with it by forwarding stuff to feed().
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if (remainder && strlen(remainder)) feed(remainder);
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if (objectp(active)) active -> removeGateway(streamid);
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#ifdef _flag_log_sockets_XMPP
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log_file("RAW_XMPP", "\n%O disc\t%O", ME, ctime());
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#endif
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destruct(ME);
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// expected or unexpected disconnect? flags shall tell
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return flags & TCP_PENDING_DISCONNECT;
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}
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// this is called by active if it was created only for the
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// purpose of doing dialback and the attempt failed
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remote_connection_failed() {
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STREAM_ERROR("remote-connection-failed", "")
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QUIT
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}
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qScheme() { return "jabberserver"; }
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void create() {
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unless (clonep()) return;
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// not multilingual yet - TODO
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sTextPath(0, "en", "jabber");
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// we could switch them into variables anytime
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// cmdchar = '/'; // to remain in style with /me
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// actchar = ':'; // let's try some mudlike emote for jabber
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::create();
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}
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#ifdef WANT_S2S_TLS
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// similar code in other files
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tls_logon(result) {
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if (result == 0) {
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certinfo = tls_certificate(ME, 0);
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P3(("%O tls_logon fetching certificate: %O\n", ME, certinfo))
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# ifdef ERR_TLS_NOT_DETECTED
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} else if (result == ERR_TLS_NOT_DETECTED) {
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// just go on without encryption
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# endif
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} else if (result < 0) {
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P1(("%O TLS error %d: %O\n", ME, result, tls_error(result)))
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QUIT
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} else {
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P0(("tls_logon with result > 0?!?!\n"))
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// should not happen
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}
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}
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#endif
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logon(a) {
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P4(("logon(%O) beim jabber:gateway\n", a))
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call_out(#'quit, TIME_LOGIN_IDLE);
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set_combine_charset(COMBINE_CHARSET);
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#ifdef INPUT_NO_TELNET
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input_to(#'feed, INPUT_IGNORE_BANG | INPUT_CHARMODE | INPUT_NO_TELNET);
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#else
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enable_telnet(0, ME);
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input_to(#'feed, INPUT_IGNORE_BANG | INPUT_CHARMODE);
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#endif
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#ifdef _flag_log_sockets_XMPP
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log_file("RAW_XMPP", "\n%O logon\t%O", ME, ctime());
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#endif
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// return ::logon(a);
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}
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verify_connection(string to, string from, string type) {
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P2(("verify connection from %s to %s type %s\n", to, from, type))
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/* 10. Receiving server informs originating server of the result */
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emit(sprintf("<db:result from='%s' to='%s' type='%s'/>",
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to, from, type));
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if (type != "valid") {
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emitraw("</stream:stream>");
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P2(("quitting invalid stream\n"))
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QUIT
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} else {
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#ifdef LOG_XMPP_AUTH
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D0( log_file("XMPP_AUTH", "\n%O has authenticated %O via dialback", ME, from); )
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#endif
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sAuthenticated(from);
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#ifdef XMPP_BIDI
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if (bidi) {
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P0(("doing register target for xmpp bidi!!!!\n"))
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register_target(XMPP + from);
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}
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#endif
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while (remove_call_out(#'quit) != -1);
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}
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}
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#if 0
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volatile mapping proper_addressing = ([
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"stream:error" : 1,
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"auth" : 1,
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"response" : 1,
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#ifdef SWITCH2PSYC
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"switching" : 1,
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#endif
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"starttls" : 1
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]);
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#endif
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jabberMsg(XMLNode node) {
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mixed *su, *tu;
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string source, target;
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object o;
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mixed t, t2;
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target = node["@to"];
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source = node["@from"];
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origin = XMPP + source;
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/* TODO: we should reset origin when we're done here
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*/
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#ifdef XMPPERIMENTAL
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/* note for world domination:
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* if !target target is the cslave
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* we need to reflect this somehow in sendmsg...
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* or we can handle it as a special case everywhere
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*/
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if (node[Tag] == "presence" && !target) {
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string mc;
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su = parse_uniform(origin);
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unless(su) return 0;
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o = find_context(su[UUserAtHost]);
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PT(("find_context(%O) -> %O\n", su[UUserAtHost], o))
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unless (o) return 1;
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if (node["@type"] == "probe") {
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mc = "_request_status_person";
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data = "";
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} else {
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mc = "_notice_presence_here"; // does not handle away, etc
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data = "[_nick] is available.";
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//vars["_INTERNAL_mood_jabber"] = "neutral";
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}
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o -> castmsg(origin, mc, data, ([ "_nick" : su[UUser] ]));
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return 1;
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}
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#endif
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/* error conditions as in XMPP CORE 4.7.3 first */
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// todo.. use proper_addressing but this combination of && and || is not
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// very nice.. you can't expect people to know which operator is stronger
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if (! (source && target
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|| node[Tag] == "stream:error"
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|| node[Tag] == "auth"
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#ifdef SWITCH2PSYC
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|| node[Tag] == "switching"
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#endif
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#ifdef XMPP_BIDI
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|| node[Tag] == "bidi"
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#endif
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|| node[Tag] == "starttls") ) {
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// apparently we are the only jabber server to complain about it
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if (node[Tag] == "stream:features") {
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P3(("(warn) %O got buggy stream:features: %O\n", ME, node))
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return;
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}
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monitor_report("_error_syntax_missing_element_jabber",
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S("%O got jabber %O type %O from %O to %O", ME, node[Tag],
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node["@type"], source, target));
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PT(("node %O\n", node))
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STREAM_ERROR("improper-addressing", "")
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remove_interactive(ME);
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return;
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}
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P2(("%O jabberMsg(%O from %O to %O)\n", ME, node[Tag], source, target))
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/* handling for stream features, dialback, etc pp */
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switch (node[Tag]) {
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#ifdef SWITCH2PSYC
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case "switching":
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// tested manually using:
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// <?xml version='1.0'?><stream:stream xmlns:stream='http://etherx.jabber.org/streams' xmlns='jabber:server' to='localhost' xmlns:db='jabber:server:dialback' version='1.0'><switching xmlns='http://switch.psyced.org'><scheme>psyc</scheme></switching>
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emitraw("<switched xmlns='http://switch.psyced.org'/>");
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PT(("received 'switching'. authhosts %O\n", authhosts))
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o = ("S:psyc:" + host) -> load();
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P1(("%O switching to %O for %O\n", ME, o, host))
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exec(o, ME);
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o -> logon();
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o -> sAuthHosts(authhosts);
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destruct(ME);
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return;
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#endif
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#ifdef XMPP_BIDI
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case "bidi":
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if (node["@xmlns"] == "urn:xmpp:bidi") {
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//emit("<success xmlns='urn:xmpp:bidi'/>");
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bidi = 1;
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}
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return;
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#endif
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case "db:result":
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target = NAMEPREP(target);
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source = NAMEPREP(source);
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origin = XMPP + source;
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/* this is receiving step 4
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* what we do now is
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* 8. receiving server sends authorative server
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* a request for verification of a key
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*/
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// if we dont know the host, complain
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// put NAMEPREP(_host_XMPP) into the localhost mapping pleeeease
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//if (target != NAMEPREP(_host_XMPP)) {
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unless (is_localhost(target)) {
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monitor_report("_error_unknown_host",
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sprintf("%O sent us a dialback packet believing we would be %O",
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source, target));
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emit(sprintf("<db:result from='%s' to='%s' type='error'>"
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"<error type='cancel'>"
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"<item-not-found xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/>"
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"</error>"
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"</db:result>",
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target, source));
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/* no more...
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STREAM_ERROR("host-unknown", "")
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remove_interactive(ME);
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*/
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return;
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}
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// dialback without dial-back - if the certificate is valid and the sender
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// is contained in the subject take the shortcut and consider the request
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// valid
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// paranoia note: as with XEP 0178 we might want to check dns anyway to
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// protect against stolen certificates
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if (mappingp(certinfo) && certinfo[0] == 0
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&& node["@from"] && tls_check_service_identity(node["@from"], certinfo, "xmpp-server")) {
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P2(("dialback without dialback %O\n", certinfo))
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verify_connection(node["@to"], node["@from"], "valid");
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} else {
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sendmsg(origin,
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"_dialback_request_verify", 0,
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([ "_INTERNAL_target_jabber" : source,
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// we shouldnt have to NAMEPREP a static string.. FIXME
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"_INTERNAL_source_jabber" : NAMEPREP(_host_XMPP),
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"_dialback_key" : node[Cdata],
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"_tag" : streamid
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])
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);
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unless (o = find_target_handler(NAMEPREP(origin))) {
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// sendmsg should have created it!
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P0(("%O could not find target handler for %O "
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"after sendmsg\n", ME, origin))
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return;
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}
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active = o -> sGateway(ME, target, streamid);
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}
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return;
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case "db:verify":
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target = NAMEPREP(target);
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source = NAMEPREP(source);
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// pretty much everywhere else, where XMPP is prepended, either
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// the UString of su[] or tu[] should have been used..
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origin = XMPP + source;
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/* check to and from */
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/* verify dialback key */
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o = find_target_handler(origin);
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unless (o) {
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mixed *u = parse_uniform(origin);
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// probably this has been destructed due to gone wrong
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P0(("ERROR: could not find_target_handler for %O in db:verify\n",
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origin))
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// fatal error, we have not called that host
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// probably thats what invalid-from is for
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#ifdef QUEUE_WITH_SCHEME
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o = ("C:"+origin)-> circuit(u[UHost], u[UPort]
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|| JABBER_S2S_SERVICE, 0, "xmpp-server", origin);
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#else
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o = ("C:"+origin)-> circuit(u[UHost], u[UPort]
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|| JABBER_S2S_SERVICE, 0, "xmpp-server", u[UHostPort]);
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#endif
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register_target(origin, o);
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}
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// TODO: das hier gehoert noch eins weiter unten rein
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// oder einfach ein stueckl tiefer
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active = o -> sGateway(ME, target, streamid);
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unless (node["@type"]){
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int valid;
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/* we were calling this server, this packet is step 8
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* and we are doing step 9
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*/
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/* if we dont recognize target (currently: == _host_XMPP)
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* then croak with a host-unknown and commit suicide
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*/
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// same as above...
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unless (is_localhost(target)) {
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emit(sprintf("<db:verify from='%s' to='%s' id='%s' type='error'>"
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"<error type='cancel'>"
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"<item-not-found xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/>"
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"</error>"
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"</db:result>",
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target, source, node["@id"]));
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/*
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STREAM_ERROR("host-unknown", "")
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QUIT
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*/
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}
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valid = node[Cdata] == DIALBACK_KEY(node["@id"], source,
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target);
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emit(sprintf("<db:verify from='%s' to='%s' type='%s' id='%s'/>",
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target, source,
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valid ? "valid" : "invalid",
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node["@id"]));
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} else {
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P0(("received db:verify without type on an incoming connection\n"))
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}
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return;
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case "starttls":
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#ifdef WANT_S2S_TLS
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if (tls_available()) {
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emitraw("<proceed xmlns='" NS_XMPP "xmpp-tls'/>");
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# if __EFUN_DEFINED__(tls_want_peer_certificate)
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tls_want_peer_certificate(ME);
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# endif
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tls_init_connection(ME, #'tls_logon);
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return;
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}
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#endif
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emitraw("<failure xmlns='" NS_XMPP "xmpp-tls'/>");
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return;
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case "stream:error":
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if (node["/connection-timeout"]) {
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/* ignore it */
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} else if (node["/system-shutdown"]) {
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P1(("%O: counterpart is doing a system shutdown\n", ME))
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/* ignore it */
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} else {
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P0(("stream error in %O: %O\n", ME, node))
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}
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return;
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#ifdef WANT_S2S_SASL
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case "auth":
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// if the authorization id is present, use that, else use streamfrom
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// note that the standard says that streamfrom MUST be the same as the authorization id
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// so we could save the base64 stuff and use streamfrom in all cases if we ignore the
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// standard
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t = node[Cdata] ? to_string(decode_base64(node[Cdata])) : streamfrom;
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switch (node["@mechanism"]) {
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case "EXTERNAL":
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if (tls_query_connection_state(ME) == 1
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&& mappingp(certinfo)
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&& certinfo[0] == 0) {
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/*
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* order of checks should be first against
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* id-on-xmppAddr field and only if that is
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* unused match against common name
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*/
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int success = 0;
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success = tls_check_service_identity(t, certinfo, "xmpp-server");
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if (success) {
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emitraw("<success xmlns='" NS_XMPP "xmpp-sasl'/>");
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P2(("successful sasl external authentication with "
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"%O\n", t))
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sAuthenticated(t);
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while (remove_call_out(#'quit) != -1);
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#ifdef XMPP_BIDI
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if (bidi) {
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P0(("doing register target for xmpp bidi!!!!\n"))
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register_target(XMPP + t);
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}
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#endif
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# ifdef LOG_XMPP_AUTH
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D0( log_file("XMPP_AUTH", "\n%O has authenticated %O via SASL external", ME, t); )
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# endif
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} else {
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SASL_ERROR("not-authorized")
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QUIT
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}
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} else {
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// we did not offer it definetly
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SASL_ERROR("invalid-mechanism")
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QUIT
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}
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break;
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default:
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SASL_ERROR("invalid-mechanism")
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QUIT
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break;
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}
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return;
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#endif
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}
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su = parse_uniform(origin);
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unless (su) {
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// this is not jid-malformed, rather invalid-from
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P0(("%O: source jid malformed? %O\n", ME, source))
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STREAM_ERROR("invalid-from", "I could not parse that from");
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QUIT // too hard?
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}
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/* security policy
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* DROP unless authenticated
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* see XMPP-Core §4.3
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*/
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unless (qAuthenticated(su[UHost])) {
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PT(("%O dropping %O: su[UHost] %O\n",
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ME, node[Tag], su[UHost]))
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STREAM_ERROR("invalid-from", "")
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QUIT // too hard?
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}
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tu = parse_uniform(XMPP + target);
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unless (tu) {
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// we should croak with an jid-malformed error and commit suicide
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// jabberd responds with a invalid-from, but that doesnt seem
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// to be the right semantic
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// but... well, for now
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P0(("gateway: target jid malformed? %O in %O\n", target, ME))
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STREAM_ERROR("invalid-from", "could not parse that to");
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QUIT // too hard?
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}
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return ::jabberMsg(node, origin, su, tu);
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}
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open_stream(XMLNode node) {
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string packet;
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float version;
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// make a loooong random string and hash it not to expose our random numbers
|
|
streamid = sha1(RANDHEXSTRING + RANDHEXSTRING + RANDHEXSTRING + RANDHEXSTRING);
|
|
version = to_float(node["@version"]);
|
|
packet = sprintf("<?xml version='1.0' encoding='UTF-8' ?>"
|
|
"<stream:stream "
|
|
"xmlns='jabber:server' "
|
|
"xmlns:db='jabber:server:dialback' "
|
|
"xmlns:stream='http://etherx.jabber.org/streams' "
|
|
"xml:lang='en' id='%s' ", streamid);
|
|
if (node["@to"]) {
|
|
packet += "from='" + node["@to"] + "' ";
|
|
} else {
|
|
packet += "from='" _host_XMPP "' ";
|
|
}
|
|
if (node["@from"]) {
|
|
packet += "to='" + node["@from"] + "' ";
|
|
}
|
|
if (node["@to"] && !(is_localhost(node["@to"]))) {
|
|
emit(packet + ">");
|
|
STREAM_ERROR("host-unknown", "")
|
|
QUIT
|
|
return;
|
|
}
|
|
if (node["@xmlns"] != "jabber:server") {
|
|
/* If the namespace name is incorrect, then Receiving Server
|
|
* MUST generate an <invalid-namespace/> stream error condition
|
|
* and terminate both the XML stream and the underlying TCP connection.
|
|
*/
|
|
emit(packet + ">");
|
|
STREAM_ERROR("invalid-namespace", "")
|
|
QUIT
|
|
return;
|
|
}
|
|
streamfrom = node["@from"];
|
|
|
|
/* if stream version is >= "1.0" reply with stream version
|
|
* attribute and add a stream:feature tag
|
|
*/
|
|
if (version >= 1) {
|
|
packet += "version='1.0'>";
|
|
emit(packet);
|
|
// this sends one stanza per tcp packet
|
|
packet = "<stream:features>";
|
|
#ifdef WANT_S2S_TLS
|
|
if (tls_available()) {
|
|
if (tls_query_connection_state(ME) == 0) {
|
|
packet += "<starttls xmlns='" NS_XMPP "xmpp-tls'/>";
|
|
} else unless (mappingp(authhosts)) {
|
|
# ifdef WANT_S2S_SASL
|
|
// if the other side did present a client certificate
|
|
// and we have verified it as X509_V_OK (0)
|
|
// we offer SASL external (authentication via name
|
|
// presented in x509 certificate
|
|
PT(("gateway::certinfo %O\n", certinfo))
|
|
# ifndef DIALBACK_WITHOUT_DIAL_BACK
|
|
if (mappingp(certinfo) && certinfo[0] == 0) {
|
|
// if from attribute is present we only offer
|
|
// sasl external if we know that it will succeed
|
|
// later on
|
|
if (node["@from"] &&
|
|
tls_check_service_identity(node["@from"], certinfo,
|
|
"xmpp-server")) {
|
|
packet += "<mechanisms xmlns='" NS_XMPP "xmpp-sasl'>";
|
|
packet += "<mechanism>EXTERNAL</mechanism>";
|
|
packet += "</mechanisms>";
|
|
}
|
|
}
|
|
# endif
|
|
# endif
|
|
}
|
|
}
|
|
#endif
|
|
#ifdef SWITCH2PSYC
|
|
packet += "<switch xmlns='http://switch.psyced.org'>"
|
|
"<scheme>psyc</scheme>"
|
|
"</switch>";
|
|
#endif
|
|
#ifdef XMPP_BIDI
|
|
packet += "<bidi xmlns='urn:xmpp:features:bidi'/>";
|
|
#endif
|
|
packet += "<dialback xmlns='urn:xmpp:features:dialback'><errors/></dialback>";
|
|
packet += "</stream:features>";
|
|
} else {
|
|
packet += ">";
|
|
}
|
|
emit(packet);
|
|
}
|
|
|
|
/* watch out, this is used by the user objects cmd() parser!
|
|
* and that must not happen as we are using unidirectional sockets
|
|
* this is not really a bug, we just dont handle those yet...
|
|
* the strategy will be to do a sendmsg() to origin
|
|
*/
|
|
w(string mc, string data, mapping vars, mixed source) {
|
|
P2(("%O using w() for %O, unimplemented... mc %O, source %O\n",
|
|
ME, origin, mc, source))
|
|
unless (vars) vars = ([ ]);
|
|
vars["_INTERNAL_source_jabber"] = objectp(source) ? mkjid(source) : _host_XMPP;
|
|
sendmsg(origin, mc, data, vars);
|
|
}
|
|
|
|
#ifdef XMPP_BIDI
|
|
int msg(string source, string mc, string data,
|
|
mapping vars, int showingLog, string target) {
|
|
// copy+paste stuff from active.c
|
|
vars = copy(vars);
|
|
#ifdef DEFLANG
|
|
unless(vars["_language"]) vars["_language"] = DEFLANG;
|
|
#else
|
|
unless(vars["_language"]) vars["_language"] = "en";
|
|
#endif
|
|
/* another note:
|
|
* instead of queuing the msg()-calls we could simply queue
|
|
* the output from emit (use the new net/outputb ?)
|
|
* this avoids bugs with destructed objects
|
|
*/
|
|
#if 0 // !EXPERIMENTAL
|
|
/* currently, we want _status_person_absent
|
|
* this may change...
|
|
*/
|
|
else if (abbrev("_status_person_absent", mc)) return 1;
|
|
#endif
|
|
switch (mc){
|
|
case "_message_echo_private":
|
|
return 1;
|
|
}
|
|
// desperate hack
|
|
unless (vars["_INTERNAL_mood_jabber"])
|
|
vars["_INTERNAL_mood_jabber"] = "neutral";
|
|
if (abbrev("_dialback", mc)) {
|
|
P0(("gateway got dialback method %O, this should not happen...\n", mc))
|
|
return 1;
|
|
}
|
|
|
|
determine_sourcejid(source, vars);
|
|
determine_targetjid(target, vars);
|
|
if (vars["_place"]) vars["_place"] = mkjid(vars["_place"]);
|
|
// end of copy+paste from active
|
|
return ::msg(source, mc, data, vars, showingLog, target);
|
|
}
|
|
#endif
|