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git://git.psyced.org/git/psyced
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521 lines
15 KiB
C
521 lines
15 KiB
C
// $Id: server.c,v 1.159 2008/10/01 10:59:24 lynx Exp $ // vim:syntax=lpc:ts=8
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#include "jabber.h"
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#include "server.h" // inherits net/server
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#include "person.h" // find_person
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#include "uniform.h"
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#include <sys/tls.h>
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volatile string authtag;
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volatile string resource;
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volatile string streamid;
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volatile string pass;
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volatile string language;
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int reprompt;
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volatile string sasluser;
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volatile string saslchallenge;
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#ifdef __TLS__
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volatile mixed certinfo;
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#endif
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qScheme() { return "jabber"; }
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// qName() { } // we need that in common.c - probably no more
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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, 0, "jabber");
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}
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#ifdef __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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# ifdef WANT_S2S_SASL /* hey wait.. this is not S2S here!? */
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certinfo = tls_certificate(ME, 0);
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# endif
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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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// no encryption. no problem.
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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 // don't fall back to plaintext instead
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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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string *splitsasl(string data) {
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string *result = ({ "" });
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int *decoded;
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int i, j;
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decoded = decode_base64(data);
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foreach(i : decoded) {
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if (i == 0) {
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j++;
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result += ({ "" });
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continue;
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}
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result[j] += sprintf("%c", i);
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}
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return result;
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}
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promptForPassword(user) {
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P2(("promptForPassword with %O\n", user))
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if (reprompt == 1 || pass) {
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w("_error_invalid_password", "Invalid password.\n",
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([ "_tag_reply" : authtag || "", "_nick" : nick,
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"_resource" : resource ]) );
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emitraw("</stream:stream>");
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QUIT // should we really close the stream here?
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return; // ?
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}
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P2(("nick %O, pass %O\n", nick, pass))
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unless (pass) {
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reprompt = 1;
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w("_query_password", 0, //"Please provide your password.",
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([ "_nick": nick, "_tag_reply" : authtag || "" ]) );
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}
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return 1;
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}
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logon(a) {
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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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P3(("logon(%O) beim jabber:server.c\n", a))
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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_to_settings =
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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_to_settings =
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INPUT_IGNORE_BANG | INPUT_CHARMODE);
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#endif
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return ::logon(a);
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}
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createUser(nick) {
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return named_clone(JABBER_PATH "user", nick);
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}
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userLogon() {
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user->sTag(authtag);
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user->sResource(resource);
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return ::userLogon();
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}
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authChecked(result, varargs array(mixed) args) {
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// a point where we could be sending our jabber:iq:auth reply
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// instead of letting _notice_login do that
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PT(("%O got authChecked %O, %O\n", ME, result, args))
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return ::authChecked(result, args...);
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}
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jabberMsg(XMLNode node) {
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XMLNode helper;
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string id;
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mixed t;
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id = node["@id"] || ""; // tag?
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switch (node[Tag]) {
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case "iq":
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if (node["/bind"]) {
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// suppresses the jabber:iq:auth reply in the SASL case
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authtag = -1;
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unless (sasluser) {
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// not-allowed stanza error?
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return 0;
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}
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helper = node["/bind"];
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// see XMPP-core, 7. Resource binding
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if (helper["/resource"])
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resource = helper["/resource"][Cdata];
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// assign a resource
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if (!stringp(resource) || resource == "")
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resource = "PSYC";
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nick = sasluser;
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sasluser = ""; // why an empty string? explanation needed
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emit("<iq type='result' id='"+ id +"'>"
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"<bind xmlns='" NS_XMPP "xmpp-bind'><jid>"+
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nick +"@" SERVER_HOST "/"+ resource +"</jid>"
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"</bind></iq>");
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return 0;
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} else if (node["/session"]) {
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unless(user) return 0; // what then?
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emit("<iq type='result' id='"+ id +"' from='"
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SERVER_HOST "'/>");
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user -> vSet("language", language);
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return morph();
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}
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switch (node["/query"]["@xmlns"]) {
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// old-school style.. for clients that don't like SASL, like kopete, jabbin
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case "jabber:iq:auth":
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authtag = id;
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if (node["@type"] == "get"){
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// hello(nick) ?
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w("_query_password", 0,
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([ "_nick": nick, "_tag_reply": authtag || "" ]), "");
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} else if (node["@type"] == "set") {
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helper = node["/query"];
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resource = helper["/resource"][Cdata];
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nick = helper["/username"][Cdata];
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if (mappingp(helper["/password"]) &&
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(pass = helper["/password"][Cdata])) {
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hello(nick, 0, pass);
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} else if (mappingp(helper["/digest"]) &&
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(pass = helper["/digest"][Cdata])) {
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P3(("jabber:iq:auth/digest got %O\n", pass))
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hello(nick, 0, pass, "sha1", streamid);
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} else {
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// TODO: write an error?
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P0(("jabber:server iq auth set without pass or digest\n"))
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}
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}
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return 1;
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case "jabber:iq:register":
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if (node["@type"] == "get"){
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string packet;
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#if defined(_flag_disable_unauthenticated_users_XMPP) || defined(_flag_disable_registration_XMPP)
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// super dirty.. this should all be in textdb
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packet = sprintf("<iq type='result' id='%s'>"
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"<query xmlns='jabber:iq:register'/>"
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"<error code='501'>Registration by XMPP not permitted.</error></iq>",
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id);
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#else
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packet = sprintf("<iq type='result' id='%s'>"
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"<query xmlns='jabber:iq:register'>"
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"<instructions>You dont even need to register, "
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"this is psyced. Manual at http://help.pages.de</instructions>"
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"<name/><email/><username/><password/></query></iq>",
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id);
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#endif
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emit(packet);
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} else if (node["@type"] == "set"){
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string packet;
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packet = sprintf("<iq type='error' id='%s'>"
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"<query xmlns='jabber:iq:register'>",
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id);
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unless ((helper = node["/query"])
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&& (t = helper["/username"][Cdata])
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&& (user = summon_person(t))) {
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// internal server error
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STREAM_ERROR("internal-server-error",
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"Oh dear! Internal server error")
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// QUIT
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}
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unless (user -> isNewbie()) {
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// already registered to someone else
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packet += "</query><error code='406' type='cancel'>"
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"<conflict xmlns='" NS_XMPP "xmpp-stanzas'/>"
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"</error></iq>";
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emit(packet);
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// elmex says, disconnect is wrong here:
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// QUIT
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// it should at least close the stream
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} else unless ((t = helper["/username"]) &&
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t[Cdata] &&
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(t = helper["/password"]) &&
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t[Cdata]) {
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packet += "</query><error code='406' type='modify'>"
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"<not-acceptable xmlns='" NS_XMPP "xmpp-stanzas'/>"
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"</error></iq>";
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emit(packet);
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// QUIT
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} else {
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#if defined(_flag_disable_unauthenticated_users_XMPP) || defined(_flag_disable_registration_XMPP)
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emit(sprintf("<iq type='result' id='%s'>"
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"<query xmlns='jabber:iq:register'/>"
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"<error code='501'>Registration by XMPP not permitted.</error></iq>",
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id));
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#else
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user -> vSet("password", t[Cdata]);
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if (t = helper["/email"]) {
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user -> vSet("email", helper["/email"]);
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}
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// maybe immediate save is not really a good idea
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// user -> save();
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emit(sprintf("<iq type='result' id='%s'/>", id));
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#endif
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}
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user = 0;
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}
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}
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break;
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case "starttls":
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#if __EFUN_DEFINED__(tls_available)
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if (tls_available()) {
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emitraw("<proceed xmlns='" NS_XMPP "xmpp-tls'/>");
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// we may not write until tls_logon is called!
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tls_init_connection(ME, #'tls_logon);
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} else {
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P1(("%O received a 'starttls' but TLS isn't available.\n", ME))
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}
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#else
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emitraw("<failure xmlns='" NS_XMPP "xmpp-tls'/></stream:stream>");
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destruct(ME);
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#endif
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break;
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case "auth":
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switch (node["@mechanism"]) {
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case "DIGEST-MD5":
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// TODO: time-based nonce
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saslchallenge = RANDHEXSTRING;
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emit("<challenge xmlns='" NS_XMPP "xmpp-sasl'>" +
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encode_base64(sprintf("realm=\"%s\",nonce=\"%s\","
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"qop=\"auth\",charset=utf-8,"
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"algorithm=md5-sess",
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SERVER_HOST,
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saslchallenge)
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) + "</challenge>");
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break;
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case "PLAIN":
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string *creds;
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creds = splitsasl(node[Cdata]);
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// check that creds[2] is valid for user creds[1]
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// and in case of success:
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if ((sizeof(creds) == 3)
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&& (user = find_person(creds[1])
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|| (user = createUser(creds[1])))
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#ifdef ASYNC_AUTH
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) {
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mixed authCb = CLOSURE((int result), (mixed creds), (creds),
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{
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if (result) {
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sasluser = creds[1];
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emitraw("<success xmlns='" NS_XMPP "xmpp-sasl'/>");
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} else {
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sasluser = 0;
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SASL_ERROR("temporary-auth-failure")
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QUIT
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}
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return;
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});
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user -> checkPassword(creds[2], "plain", 0, 0, authCb);
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#else
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&& user -> checkPassword(creds[2], "plain")) {
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sasluser = creds[1];
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emitraw("<success xmlns='" NS_XMPP "xmpp-sasl'/>");
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#endif
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} else {
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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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#ifdef __TLS__
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case "EXTERNAL":
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# if 0
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// TODO: basically this works but is untested due to
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// lack of clients
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// also, it uses email addresses instead of xmpp jids
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// and i am not sure if I should check who signed the cert,
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// as I probably want my users only to use certs created by me
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unless (node[Cdata]) {
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SASL_ERROR("incorrect-encoding")
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QUIT
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} else unless (mappingp(certinfo) && certinfo[0] == 0
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&& certinfo["1.2.840.113549.1.9.1"]) {
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SASL_ERROR("invalid-mechanism")
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QUIT
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} else {
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string deco, ho, u;
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// TODO: there could be a try-except block here with
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// incorrect-encoding sasl error
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deco = to_string(decode_base64(node[Cdata]));
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// TODO: the right thingie could be a list!
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unless (deco == certinfo["1.2.840.113549.1.9.1"]) {
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// TODO: not sure about this one
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SASL_ERROR("invalid-mechanism")
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QUIT
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}
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// lets see if its one of our users
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sscanf(deco, "%s@%s", u, ho);
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unless (is_localhost(ho)) {
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// wrong host
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SASL_ERROR("invalid-authzid")
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QUIT
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// TODO: consider legalized names
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} else unless ( ///// legal_name(u)) {
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SASL_ERROR("not-authorized")
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QUIT
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} else {
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user = find_person(u) || createUser(u);
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sasluser = u;
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emitraw("<success xmlns='" NS_XMPP "xmpp-sasl'/>");
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}
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}
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# else
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SASL_ERROR("invalid-mechanism")
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QUIT
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# endif
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break;
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#endif
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#ifndef _flag_disable_unauthenticated_users_XMPP
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case "ANONYMOUS":
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unless(node[Cdata]) {
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SASL_ERROR("incorrect-encoding")
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QUIT // i suppose this was missing here --lynX
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} else {
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string u;
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t = to_string(decode_base64(node[Cdata]));
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u = legal_name(t);
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unless(u) {
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if (t) {
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SASL_ERROR("not-authorized")
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} else {
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SASL_ERROR("invalid-authzid")
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}
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QUIT
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}
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PT(("wants to auth anonymously as %O\n", u))
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unless (user = summon_person(u)) {
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SASL_ERROR("temporary-auth-failure")
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QUIT
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}
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unless (user -> isNewbie()) {
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SASL_ERROR("not-authorized")
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QUIT
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}
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sasluser = u;
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emitraw("<success xmlns='" NS_XMPP "xmpp-sasl'/>");
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}
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break;
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#endif
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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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break;
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case "response":
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// this does not behave according to rfc3920 but rather the 3920bis
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// version
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if (node[Cdata] && (t = to_string(decode_base64(node[Cdata])))) {
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mapping creds = sasl_parse(t);
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mixed authCb = CLOSURE((int result), (mixed creds), (creds),
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{
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if (result) {
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P3(("digest md5 success\n"))
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sasluser = creds["username"];
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P3(("result is %O\n", result))
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emit("<success xmlns='" NS_XMPP "xmpp-sasl'>"
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+ encode_base64("rspauth=" + result) +
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"</success>");
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} else {
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P0(("digest md5 failure: %O\n", creds))
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sasluser = 0;
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SASL_ERROR("invalid-authzid") // why do we get here?
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QUIT
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}
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return 0; // ignored, but avoids a warning
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});
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user = find_person(creds["username"]) || createUser(creds["username"]);
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user -> checkPassword(1, "digest-md5", 0, creds, authCb);
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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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break;
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default:
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/* angeblich werden andere Pakete in diesen Zustand gequeried
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* aber das glaube ich nicht dass das wirklich so ist
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* wie auch immer haetten wir sonst mittlerweile net/queue fuer
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* diesen job
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*/
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P0(("jabber/server:jabberMsg default case\n"))
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}
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// return ::jabberMsg(from, cmd, args, data, all);
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return 0;
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}
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open_stream(XMLNode node) {
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string features;
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string header;
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P2(("%O open_stream from %O\n", ME, query_ip_name()))
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streamid = RANDHEXSTRING;
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unless(node["@xmlns"] == "jabber:client") {
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// TODO: is this a fatal error?
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}
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switch (node["@xml:lang"]) {
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case "DE": // what about DE_at etc?
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case "de":
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case "german":
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case "German": // curious... isnt the xml:lang supposed to be 'de'?
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language = "de";
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break;
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default:
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if (!language) language = "en";
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break;
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}
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features = "";
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header = "<stream:stream "
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"from='" SERVER_HOST "' "
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"xmlns='jabber:client' "
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"xmlns:stream='http://etherx.jabber.org/streams' ";
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if (node["@version"] == "1.0") {
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header += "version='1.0' ";
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features = "<stream:features>";
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#if __EFUN_DEFINED__(tls_available)
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if (tls_available() && tls_query_connection_state(ME) == 0)
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features += "<starttls xmlns='" NS_XMPP "xmpp-tls'/>";
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#endif
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if (sasluser) {
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features += "<bind xmlns='" NS_XMPP "xmpp-bind'/>";
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features += "<session xmlns='" NS_XMPP "xmpp-session'/>";
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} else {
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features += "<mechanisms xmlns='" NS_XMPP "xmpp-sasl'>"
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#ifndef _flag_disable_authentication_digest_MD5
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"<mechanism>DIGEST-MD5</mechanism>"
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#endif
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"<mechanism>PLAIN</mechanism>";
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#ifndef _flag_disable_unauthenticated_users_XMPP
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// sasl anonymous
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"<mechanism>ANONYMOUS</mechanism>";
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#endif
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// here it makes sense to use check_jabbername
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// but that is currently unused anyway
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#if __EFUN_DEFINED__(tls_available)
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if (tls_available() && tls_query_connection_state(ME) > 0
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&& mappingp(certinfo) && certinfo[0] == 0
|
|
// why do we use the old one here?
|
|
&& certificate_check_jabbername(0, certinfo)) {
|
|
features += "<mechanism>EXTERNAL</mechanism>";
|
|
}
|
|
#endif
|
|
features += "</mechanisms>";
|
|
features += "<auth xmlns='http://jabber.org/features/iq-auth'/>";
|
|
#ifndef _flag_disable_registration_XMPP
|
|
features += "<register xmlns='http://jabber.org/features/iq-register'/>";
|
|
#endif
|
|
}
|
|
features += "</stream:features>";
|
|
}
|
|
header += "id='" + streamid + "'>";
|
|
emit(header + features);
|
|
}
|
|
|
|
// overrides certificate_check_jabbername from common.c with a function
|
|
// that is approproate for authenticating users
|
|
certificate_check_jabbername(name, certinfo) {
|
|
// plan: prefer subjectAltName:id-on-xmppAddr,
|
|
// but allow email (1.2.840.113549.1.9.1)
|
|
// and subjectAltName:rfc822Name
|
|
// FIXME: do something useful here...
|
|
return 0;
|
|
}
|