* Renamed the 'jabber' module to 'xmpp' module. Also renamed functions starting...

[citadel.git] / citadel / modules / xmpp / xmpp_sasl_service.c

diff --git a/citadel/modules/xmpp/xmpp_sasl_service.c b/citadel/modules/xmpp/xmpp_sasl_service.c
new file mode 100644 (file)
index 0000000..8e952d2
--- /dev/null
+++ b/citadel/modules/xmpp/xmpp_sasl_service.c
@@ -0,0 +1,178 @@
+/*
+ * $Id$ 
+ *
+ * Barebones SASL authentication service for XMPP (Jabber) clients.
+ *
+ * Note: RFC3920 says we "must" support DIGEST-MD5 but we only support PLAIN.
+ *
+ * Copyright (c) 2007-2009 by Art Cancro
+ *
+ *  This program is free 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 <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <pwd.h>
+#include <errno.h>
+#include <sys/types.h>
+
+#if TIME_WITH_SYS_TIME
+# include <sys/time.h>
+# include <time.h>
+#else
+# if HAVE_SYS_TIME_H
+#  include <sys/time.h>
+# else
+#  include <time.h>
+# endif
+#endif
+
+#include <sys/wait.h>
+#include <string.h>
+#include <limits.h>
+#include <ctype.h>
+#include <expat.h>
+#include <libcitadel.h>
+#include "citadel.h"
+#include "server.h"
+#include "citserver.h"
+#include "support.h"
+#include "config.h"
+#include "user_ops.h"
+#include "internet_addressing.h"
+#include "md5.h"
+#include "ctdl_module.h"
+#include "serv_xmpp.h"
+
+
+/*
+ * PLAIN authentication.  Returns zero on success, nonzero on failure.
+ */
+int xmpp_auth_plain(char *authstring)
+{
+       char decoded_authstring[1024];
+       char ident[256];
+       char user[256];
+       char pass[256];
+       int result;
+
+
+       /* Take apart the authentication string */
+       memset(pass, 0, sizeof(pass));
+
+       CtdlDecodeBase64(decoded_authstring, authstring, strlen(authstring));
+       safestrncpy(ident, decoded_authstring, sizeof ident);
+       safestrncpy(user, &decoded_authstring[strlen(ident) + 1], sizeof user);
+       safestrncpy(pass, &decoded_authstring[strlen(ident) + strlen(user) + 2], sizeof pass);
+
+
+       /* If there are underscores in either string, change them to spaces.  Some clients
+        * do not allow spaces so we can tell the user to substitute underscores if their
+        * login name contains spaces.
+        */
+       convert_spaces_to_underscores(ident);
+       convert_spaces_to_underscores(user);
+
+       /* Now attempt authentication */
+
+       if (!IsEmptyStr(ident)) {
+               result = CtdlLoginExistingUser(user, ident);
+       }
+       else {
+               result = CtdlLoginExistingUser(NULL, user);
+       }
+
+       if (result == login_ok) {
+               if (CtdlTryPassword(pass) == pass_ok) {
+                       return(0);                              /* success */
+               }
+       }
+
+       return(1);                                              /* failure */
+}
+
+
+/*
+ * Output the list of SASL mechanisms offered by this stream.
+ */
+void xmpp_output_auth_mechs(void) {
+       cprintf("<mechanisms xmlns=\"urn:ietf:params:xml:ns:xmpp-sasl\">");
+       cprintf("<mechanism>PLAIN</mechanism>");
+       cprintf("</mechanisms>");
+}
+
+/*
+ * Here we go ... client is trying to authenticate.
+ */
+void xmpp_sasl_auth(char *sasl_auth_mech, char *authstring) {
+
+       if (strcasecmp(sasl_auth_mech, "PLAIN")) {
+               cprintf("<failure xmlns=\"urn:ietf:params:xml:ns:xmpp-sasl\">");
+               cprintf("<invalid-mechanism/>");
+               cprintf("</failure>");
+               return;
+       }
+
+        if (CC->logged_in) CtdlUserLogout();  /* Client may try to log in twice.  Handle this. */
+
+       if (CC->nologin) {
+               cprintf("<failure xmlns=\"urn:ietf:params:xml:ns:xmpp-sasl\">");
+               cprintf("<system-shutdown/>");
+               cprintf("</failure>");
+       }
+
+       else if (xmpp_auth_plain(authstring) == 0) {
+               cprintf("<success xmlns=\"urn:ietf:params:xml:ns:xmpp-sasl\"/>");
+       }
+
+       else {
+               cprintf("<failure xmlns=\"urn:ietf:params:xml:ns:xmpp-sasl\">");
+               cprintf("<not-authorized/>");
+               cprintf("</failure>");
+       }
+}
+
+
+
+/*
+ * Non-SASL authentication
+ */
+void xmpp_non_sasl_authenticate(char *iq_id, char *username, char *password, char *resource) {
+       int result;
+
+        if (CC->logged_in) CtdlUserLogout();  /* Client may try to log in twice.  Handle this. */
+
+       result = CtdlLoginExistingUser(NULL, username);
+       if (result == login_ok) {
+               result = CtdlTryPassword(password);
+               if (result == pass_ok) {
+                       cprintf("<iq type=\"result\" id=\"%s\"></iq>", iq_id);  /* success */
+                       return;
+               }
+       }
+
+       /* failure */
+       cprintf("<iq type=\"error\" id=\"%s\">", iq_id);
+       cprintf("<error code=\"401\" type=\"auth\">"
+               "<not-authorized xmlns=\"urn:ietf:params:xml:ns:xmpp-stanzas\"/>"
+               "</error>"
+               "</iq>"
+       );
+}