X-Git-Url: https://code.citadel.org/?a=blobdiff_plain;f=citadel%2Fmodules%2Fxmpp%2Fserv_xmpp.c;h=3248a11cb39bbbf98b1281ec78082c10d3da3774;hb=HEAD;hp=e0b61af64413e38b7978d4b42d0f5388cd2ef71a;hpb=df8fe1be788cd4193b9e213009b665b47f1ed385;p=citadel.git diff --git a/citadel/modules/xmpp/serv_xmpp.c b/citadel/modules/xmpp/serv_xmpp.c deleted file mode 100644 index e0b61af64..000000000 --- a/citadel/modules/xmpp/serv_xmpp.c +++ /dev/null @@ -1,688 +0,0 @@ -/* - * XMPP (Jabber) service for the Citadel system - * Copyright (c) 2007-2018 by Art Cancro and citadel.org - * - * This program is open source software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 3 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ - -#include "sysdep.h" -#include -#include -#include -#include -#include -#include -#include -#include - -#if TIME_WITH_SYS_TIME -# include -# include -#else -# if HAVE_SYS_TIME_H -# include -# else -# include -# endif -#endif - -#include -#include -#include -#include -#include -#include -#include "citadel.h" -#include "server.h" -#include "citserver.h" -#include "support.h" -#include "config.h" -#include "user_ops.h" -#include "database.h" -#include "msgbase.h" -#include "internet_addressing.h" -#include "md5.h" -#include "ctdl_module.h" -#include "serv_xmpp.h" - -/* uncomment for more verbosity - it will log all received XML tags */ -#define XMPP_XML_DEBUG - -/* XML_StopParser is present in expat 2.x */ -#if XML_MAJOR_VERSION > 1 -#define HAVE_XML_STOPPARSER -#endif - -struct xmpp_event *xmpp_queue = NULL; - - -#ifdef HAVE_XML_STOPPARSER -/* Stop the parser if an entity declaration is hit. */ -static void xmpp_entity_declaration(void *userData, const XML_Char *entityName, - int is_parameter_entity, const XML_Char *value, - int value_length, const XML_Char *base, - const XML_Char *systemId, const XML_Char *publicId, - const XML_Char *notationName -) { - syslog(LOG_WARNING, "xmpp: illegal entity declaration encountered; stopping parser."); - XML_StopParser(XMPP->xp, XML_FALSE); -} -#endif - - -/* - * Given a source string and a target buffer, returns the string - * properly escaped for insertion into an XML stream. Returns a - * pointer to the target buffer for convenience. - */ -static inline int Ctdl_GetUtf8SequenceLength(const char *CharS, const char *CharE) -{ - int n = 0; - unsigned char test = (1<<7); - - if ((*CharS & 0xC0) != 0xC0) - return 1; - - while ((n < 8) && - ((test & ((unsigned char)*CharS)) != 0)) - { - test = test >> 1; - n ++; - } - if ((n > 6) || ((CharE - CharS) < n)) - n = 0; - return n; -} - - -char *xmlesc(char *buf, char *str, int bufsiz) -{ - int IsUtf8Sequence; - char *ptr, *pche; - unsigned char ch; - int inlen; - int len = 0; - - if (!buf) return(NULL); - buf[0] = 0; - len = 0; - if (!str) { - return(buf); - } - inlen = strlen(str); - pche = str + inlen; - - for (ptr=str; *ptr; ptr++) { - ch = *ptr; - if (ch == '<') { - strcpy(&buf[len], "<"); - len += 4; - } - else if (ch == '>') { - strcpy(&buf[len], ">"); - len += 4; - } - else if (ch == '&') { - strcpy(&buf[len], "&"); - len += 5; - } - else if ((ch >= 0x20) && (ch <= 0x7F)) { - buf[len++] = ch; - buf[len] = 0; - } - else if (ch < 0x20) { - /* we probably shouldn't be doing this */ - buf[len++] = '_'; - buf[len] = 0; - } - else { - IsUtf8Sequence = Ctdl_GetUtf8SequenceLength(ptr, pche); - if (IsUtf8Sequence) - { - while ((IsUtf8Sequence > 0) && - (ptr < pche)) - { - buf[len] = *ptr; - ptr ++; - --IsUtf8Sequence; - } - } - else - { - char oct[10]; - sprintf(oct, "&#%o;", ch); - strcpy(&buf[len], oct); - len += strlen(oct); - } - } - if ((len + 6) > bufsiz) { - return(buf); - } - } - return(buf); -} - - -/* - * We have just received a tag from the client, so send them ours - */ -void xmpp_stream_start(void *data, const char *supplied_el, const char **attr) -{ - char xmlbuf[256]; - - while (*attr) { - if (!strcasecmp(attr[0], "to")) { - safestrncpy(XMPP->server_name, attr[1], sizeof XMPP->server_name); - } - attr += 2; - } - - cprintf(""); - - cprintf("server_name, sizeof xmlbuf)); - cprintf("id=\"%08x\" ", CC->cs_pid); - cprintf("version=\"1.0\" "); - cprintf("xmlns:stream=\"http://etherx.jabber.org/streams\" "); - cprintf("xmlns=\"jabber:client\">"); - - /* The features of this stream are... */ - cprintf(""); - - /* - * TLS encryption (but only if it isn't already active) - */ -#ifdef HAVE_OPENSSL - if (!CC->redirect_ssl) { - cprintf(""); - } -#endif - - if (!CC->logged_in) { - /* If we're not logged in yet, offer SASL as our feature set */ - xmpp_output_auth_mechs(); - - /* Also offer non-SASL authentication */ - cprintf(""); - } - - /* Offer binding and sessions as part of our feature set */ - cprintf(""); - cprintf(""); - - cprintf(""); - - CC->is_async = 1; /* XMPP sessions are inherently async-capable */ -} - - -void xmpp_xml_start(void *data, const char *supplied_el, const char **attr) { - char el[256]; - char *sep = NULL; - int i; - - /* Axe the namespace, we don't care about it */ - safestrncpy(el, supplied_el, sizeof el); - while (sep = strchr(el, ':'), sep) { - strcpy(el, ++sep); - } - -#ifdef XMPP_XML_DEBUG - syslog(LOG_DEBUG, "xmpp: ELEMENT START: <%s>", el); - for (i=0; attr[i] != NULL; i+=2) { - syslog(LOG_DEBUG, "xmpp: Attribute '%s' = '%s'", attr[i], attr[i+1]); - } -#endif - - if (!strcasecmp(el, "stream")) { - xmpp_stream_start(data, supplied_el, attr); - } - - else if (!strcasecmp(el, "query")) { - XMPP->iq_query_xmlns[0] = 0; - safestrncpy(XMPP->iq_query_xmlns, supplied_el, sizeof XMPP->iq_query_xmlns); - } - - else if (!strcasecmp(el, "bind")) { - XMPP->bind_requested = 1; - } - - else if (!strcasecmp(el, "iq")) { - for (i=0; attr[i] != NULL; i+=2) { - if (!strcasecmp(attr[i], "type")) { - safestrncpy(XMPP->iq_type, attr[i+1], sizeof XMPP->iq_type); - } - else if (!strcasecmp(attr[i], "id")) { - safestrncpy(XMPP->iq_id, attr[i+1], sizeof XMPP->iq_id); - } - else if (!strcasecmp(attr[i], "from")) { - safestrncpy(XMPP->iq_from, attr[i+1], sizeof XMPP->iq_from); - } - else if (!strcasecmp(attr[i], "to")) { - safestrncpy(XMPP->iq_to, attr[i+1], sizeof XMPP->iq_to); - } - } - } - - else if (!strcasecmp(el, "auth")) { - XMPP->sasl_auth_mech[0] = 0; - for (i=0; attr[i] != NULL; i+=2) { - if (!strcasecmp(attr[i], "mechanism")) { - safestrncpy(XMPP->sasl_auth_mech, attr[i+1], sizeof XMPP->sasl_auth_mech); - } - } - } - - else if (!strcasecmp(el, "message")) { - for (i=0; attr[i] != NULL; i+=2) { - if (!strcasecmp(attr[i], "to")) { - safestrncpy(XMPP->message_to, attr[i+1], sizeof XMPP->message_to); - } - } - } - - else if (!strcasecmp(el, "html")) { - ++XMPP->html_tag_level; - } -} - - - -void xmpp_xml_end(void *data, const char *supplied_el) { - char el[256]; - char *sep = NULL; - char xmlbuf[256]; - - /* Axe the namespace, we don't care about it */ - safestrncpy(el, supplied_el, sizeof el); - while (sep = strchr(el, ':'), sep) { - strcpy(el, ++sep); - } - -#ifdef XMPP_XML_DEBUG - syslog(LOG_DEBUG, "xmpp: ELEMENT END : <%s>", el); - if (XMPP->chardata_len > 0) { - syslog(LOG_DEBUG, "xmpp: chardata: %s", XMPP->chardata); - } -#endif - - if (!strcasecmp(el, "resource")) { - if (XMPP->chardata_len > 0) { - safestrncpy(XMPP->iq_client_resource, XMPP->chardata, sizeof XMPP->iq_client_resource); - striplt(XMPP->iq_client_resource); - } - } - - else if (!strcasecmp(el, "username")) { /* NON SASL ONLY */ - if (XMPP->chardata_len > 0) { - safestrncpy(XMPP->iq_client_username, XMPP->chardata, sizeof XMPP->iq_client_username); - striplt(XMPP->iq_client_username); - } - } - - else if (!strcasecmp(el, "password")) { /* NON SASL ONLY */ - if (XMPP->chardata_len > 0) { - safestrncpy(XMPP->iq_client_password, XMPP->chardata, sizeof XMPP->iq_client_password); - striplt(XMPP->iq_client_password); - } - } - - else if (!strcasecmp(el, "iq")) { - - /* - * iq type="get" (handle queries) - */ - if (!strcasecmp(XMPP->iq_type, "get")) { - - /* - * Query on a namespace - */ - if (!IsEmptyStr(XMPP->iq_query_xmlns)) { - xmpp_query_namespace(XMPP->iq_id, XMPP->iq_from, XMPP->iq_to, XMPP->iq_query_xmlns); - } - - /* - * ping ( http://xmpp.org/extensions/xep-0199.html ) - */ - else if (XMPP->ping_requested) { - cprintf("iq_from)) { - cprintf("to=\"%s\" ", xmlesc(xmlbuf, XMPP->iq_from, sizeof xmlbuf)); - } - if (!IsEmptyStr(XMPP->iq_to)) { - cprintf("from=\"%s\" ", xmlesc(xmlbuf, XMPP->iq_to, sizeof xmlbuf)); - } - cprintf("id=\"%s\"/>", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf)); - } - - /* - * Unknown query ... return the XML equivalent of a blank stare - */ - else { - syslog(LOG_DEBUG, "xmpp: Unknown query <%s> - returning ", el); - cprintf("", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf)); - cprintf("" - "" - "" - ); - cprintf(""); - } - } - - /* - * Non SASL authentication - */ - else if ( - (!strcasecmp(XMPP->iq_type, "set")) - && (!strcasecmp(XMPP->iq_query_xmlns, "jabber:iq:auth:query")) - ) { - - xmpp_non_sasl_authenticate( - XMPP->iq_id, - XMPP->iq_client_username, - XMPP->iq_client_password, - XMPP->iq_client_resource - ); - } - - /* - * If this stanza was a "bind" attempt, process it ... - */ - else if ( - (XMPP->bind_requested) - && (!IsEmptyStr(XMPP->iq_id)) - && (CC->logged_in) - ) { - - /* If the client has not specified a client resource, generate one */ - - if (IsEmptyStr(XMPP->iq_client_resource)) { - generate_uuid(XMPP->iq_client_resource); - } - - /* Generate the "full JID" of the client resource */ - - if (IsEmptyStr(CC->cs_inet_email)) { // synthetic user@host if no email is set - snprintf(XMPP->client_jid, sizeof XMPP->client_jid, - "%ld@%s/%s", CC->user.usernum, CtdlGetConfigStr("c_fqdn"), XMPP->iq_client_resource - ); - } - else { // use the email address if we have it - snprintf(XMPP->client_jid, sizeof XMPP->client_jid, - "%s/%s", CC->cs_inet_email, XMPP->iq_client_resource - ); - } - - /* Tell the client what its JID is */ - - cprintf("", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf)); - cprintf(""); - cprintf("%s", xmlesc(xmlbuf, XMPP->client_jid, sizeof xmlbuf)); - cprintf(""); - cprintf(""); - } - - else if (XMPP->iq_session) { - cprintf("", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf)); - cprintf(""); - } - - else { - cprintf("", xmlesc(xmlbuf, XMPP->iq_id, sizeof xmlbuf)); - cprintf("Don't know how to do '%s'!", xmlesc(xmlbuf, XMPP->iq_type, sizeof xmlbuf)); - cprintf(""); - syslog(LOG_DEBUG, "XMPP: don't know how to do iq_type='%s' with iq_query_xmlns='%s'", XMPP->iq_type, XMPP->iq_query_xmlns); - } - - /* Now clear these fields out so they don't get used by a future stanza */ - XMPP->iq_id[0] = 0; - XMPP->iq_from[0] = 0; - XMPP->iq_to[0] = 0; - XMPP->iq_type[0] = 0; - XMPP->iq_client_resource[0] = 0; - XMPP->iq_session = 0; - XMPP->iq_query_xmlns[0] = 0; - XMPP->bind_requested = 0; - XMPP->ping_requested = 0; - } - - else if (!strcasecmp(el, "auth")) { - - /* Try to authenticate (this function is responsible for the output stanza) */ - xmpp_sasl_auth(XMPP->sasl_auth_mech, (XMPP->chardata != NULL ? XMPP->chardata : "") ); - - /* Now clear these fields out so they don't get used by a future stanza */ - XMPP->sasl_auth_mech[0] = 0; - } - - else if (!strcasecmp(el, "session")) { - XMPP->iq_session = 1; - } - - else if (!strcasecmp(el, "presence")) { - - /* Respond to a update by firing back with presence information - * on the entire wholist. Check this assumption, it's probably wrong. - */ - xmpp_wholist_presence_dump(); - } - - else if ( (!strcasecmp(el, "body")) && (XMPP->html_tag_level == 0) ) { - if (XMPP->message_body != NULL) { - free(XMPP->message_body); - XMPP->message_body = NULL; - } - if (XMPP->chardata_len > 0) { - XMPP->message_body = strdup(XMPP->chardata); - } - } - - else if (!strcasecmp(el, "message")) { - xmpp_send_message(XMPP->message_to, XMPP->message_body); - XMPP->html_tag_level = 0; - } - - else if (!strcasecmp(el, "html")) { - --XMPP->html_tag_level; - } - - else if (!strcasecmp(el, "starttls")) { -#ifdef HAVE_OPENSSL - cprintf(""); - CtdlModuleStartCryptoMsgs(NULL, NULL, NULL); - if (!CC->redirect_ssl) CC->kill_me = KILLME_NO_CRYPTO; -#else - cprintf(""); - CC->kill_me = KILLME_NO_CRYPTO; -#endif - } - - else if (!strcasecmp(el, "ping")) { - XMPP->ping_requested = 1; - } - - else if (!strcasecmp(el, "stream")) { - syslog(LOG_DEBUG, "xmpp: client shut down their stream"); - xmpp_massacre_roster(); - cprintf("\n"); - CC->kill_me = KILLME_CLIENT_LOGGED_OUT; - } - - else if (!strcasecmp(el, "query")) { - /* already processed , no further action needed here */ - } - - else if (!strcasecmp(el, "bind")) { - /* already processed , no further action needed here */ - } - - else { - syslog(LOG_DEBUG, "xmpp: ignoring unknown tag <%s>", el); - } - - XMPP->chardata_len = 0; - if (XMPP->chardata_alloc > 0) { - XMPP->chardata[0] = 0; - } -} - - -void xmpp_xml_chardata(void *data, const XML_Char *s, int len) -{ - citxmpp *X = XMPP; - - if (X->chardata_alloc == 0) { - X->chardata_alloc = SIZ; - X->chardata = malloc(X->chardata_alloc); - } - if ((X->chardata_len + len + 1) > X->chardata_alloc) { - X->chardata_alloc = X->chardata_len + len + 1024; - X->chardata = realloc(X->chardata, X->chardata_alloc); - } - memcpy(&X->chardata[X->chardata_len], s, len); - X->chardata_len += len; - X->chardata[X->chardata_len] = 0; -} - - -/* - * This cleanup function blows away the temporary memory and files used by the XMPP service. - */ -void xmpp_cleanup_function(void) { - - /* Don't do this stuff if this is not a XMPP session! */ - if (CC->h_command_function != xmpp_command_loop) return; - - if (XMPP->chardata != NULL) { - free(XMPP->chardata); - XMPP->chardata = NULL; - XMPP->chardata_len = 0; - XMPP->chardata_alloc = 0; - if (XMPP->message_body != NULL) { - free(XMPP->message_body); - } - } - XML_ParserFree(XMPP->xp); - free(XMPP); -} - - -/* - * Here's where our XMPP session begins its happy day. - */ -void xmpp_greeting(void) { - client_set_inbound_buf(4); - strcpy(CC->cs_clientname, "XMPP session"); - CC->session_specific_data = malloc(sizeof(citxmpp)); - memset(XMPP, 0, sizeof(citxmpp)); - XMPP->last_event_processed = queue_event_seq; - - /* XMPP does not use a greeting, but we still have to initialize some things. */ - - XMPP->xp = XML_ParserCreateNS("UTF-8", ':'); - if (XMPP->xp == NULL) { - syslog(LOG_ERR, "xmpp: cannot create XML parser"); - CC->kill_me = KILLME_XML_PARSER; - return; - } - - XML_SetElementHandler(XMPP->xp, xmpp_xml_start, xmpp_xml_end); - XML_SetCharacterDataHandler(XMPP->xp, xmpp_xml_chardata); - // XML_SetUserData(XMPP->xp, something...); - - /* Prevent the "billion laughs" attack against expat by disabling - * internal entity expansion. With 2.x, forcibly stop the parser - * if an entity is declared - this is safer and a more obvious - * failure mode. With older versions, simply prevent expansion - * of such entities. */ -#ifdef HAVE_XML_STOPPARSER - XML_SetEntityDeclHandler(XMPP->xp, xmpp_entity_declaration); -#else - XML_SetDefaultHandler(XMPP->xp, NULL); -#endif - - CC->can_receive_im = 1; /* This protocol is capable of receiving instant messages */ -} - - -/* - * Main command loop for XMPP sessions. - */ -void xmpp_command_loop(void) { - int rc; - StrBuf *stream_input = NewStrBuf(); - - time(&CC->lastcmd); - rc = client_read_random_blob(stream_input, 30); - if (rc > 0) { - XML_Parse(XMPP->xp, ChrPtr(stream_input), rc, 0); - } - else { - syslog(LOG_ERR, "xmpp: client disconnected: ending session."); - CC->kill_me = KILLME_CLIENT_DISCONNECTED; - } - FreeStrBuf(&stream_input); -} - - -/* - * Async loop for XMPP sessions (handles the transmission of unsolicited stanzas) - */ -void xmpp_async_loop(void) { - xmpp_process_events(); - xmpp_output_incoming_messages(); -} - - -/* - * Login hook for XMPP sessions - */ -void xmpp_login_hook(void) { - xmpp_queue_event(XMPP_EVT_LOGIN, CC->cs_inet_email); -} - - -/* - * Logout hook for XMPP sessions - */ -void xmpp_logout_hook(void) { - xmpp_queue_event(XMPP_EVT_LOGOUT, CC->cs_inet_email); -} - - -const char *CitadelServiceXMPP="XMPP"; -extern void xmpp_cleanup_events(void); -CTDL_MODULE_INIT(xmpp) -{ - if (!threading) { - CtdlRegisterServiceHook(CtdlGetConfigInt("c_xmpp_c2s_port"), - NULL, - xmpp_greeting, - xmpp_command_loop, - xmpp_async_loop, - CitadelServiceXMPP - ); - CtdlRegisterSessionHook(xmpp_cleanup_function, EVT_STOP, PRIO_STOP + 70); - CtdlRegisterSessionHook(xmpp_login_hook, EVT_LOGIN, PRIO_LOGIN + 90); - CtdlRegisterSessionHook(xmpp_logout_hook, EVT_LOGOUT, PRIO_LOGOUT + 90); - CtdlRegisterSessionHook(xmpp_login_hook, EVT_UNSTEALTH, PRIO_UNSTEALTH + 1); - CtdlRegisterSessionHook(xmpp_logout_hook, EVT_STEALTH, PRIO_STEALTH + 1); - CtdlRegisterCleanupHook(xmpp_cleanup_events); - - } - - /* return our module name for the log */ - return "xmpp"; -}