citadel/modules/jabber/xmpp_sasl_service.c

   1 /*
   2  * $Id$
   3  *
   4  * Barebones SASL authentication service for XMPP (Jabber) clients.
   5  *
   6  * Note: RFC3920 says we "must" support DIGEST-MD5 but we only support PLAIN.
   7  *
   8  * Copyright (c) 2007 by Art Cancro
   9  * This code is released under the terms of the GNU General Public License.
  10  *
  11  */
  12
  13 #include "sysdep.h"
  14 #include <stdlib.h>
  15 #include <unistd.h>
  16 #include <stdio.h>
  17 #include <fcntl.h>
  18 #include <signal.h>
  19 #include <pwd.h>
  20 #include <errno.h>
  21 #include <sys/types.h>
  22
  23 #if TIME_WITH_SYS_TIME
  24 # include <sys/time.h>
  25 # include <time.h>
  26 #else
  27 # if HAVE_SYS_TIME_H
  28 #  include <sys/time.h>
  29 # else
  30 #  include <time.h>
  31 # endif
  32 #endif
  33
  34 #include <sys/wait.h>
  35 #include <string.h>
  36 #include <limits.h>
  37 #include <ctype.h>
  38 #include <libcitadel.h>
  39 #include "citadel.h"
  40 #include "server.h"
  41 #include "citserver.h"
  42 #include "support.h"
  43 #include "config.h"
  44 #include "user_ops.h"
  45 #include "internet_addressing.h"
  46 #include "md5.h"
  47 #include "ctdl_module.h"
  48
  49 #ifdef HAVE_EXPAT
  50 #include <expat.h>
  51 #include "serv_xmpp.h"
  52
  53
  54 /*
  55  * PLAIN authentication.  Returns zero on success, nonzero on failure.
  56  */
  57 int xmpp_auth_plain(char *authstring)
  58 {
  59         char decoded_authstring[1024];
  60         char ident[256];
  61         char user[256];
  62         char pass[256];
  63         int result;
  64
  65         CtdlDecodeBase64(decoded_authstring, authstring, strlen(authstring));
  66         safestrncpy(ident, decoded_authstring, sizeof ident);
  67         safestrncpy(user, &decoded_authstring[strlen(ident) + 1], sizeof user);
  68         safestrncpy(pass, &decoded_authstring[strlen(ident) + strlen(user) + 2], sizeof pass);
  69
  70         if (!IsEmptyStr(ident)) {
  71                 result = CtdlLoginExistingUser(user, ident);
  72         }
  73         else {
  74                 result = CtdlLoginExistingUser(NULL, user);
  75         }
  76
  77         if (result == login_ok) {
  78                 if (CtdlTryPassword(pass) == pass_ok) {
  79                         return(0);                              /* success */
  80                 }
  81         }
  82
  83         return(1);                                              /* failure */
  84 }
  85
  86
  87 /*
  88  * Output the list of SASL mechanisms offered by this stream.
  89  */
  90 void xmpp_output_auth_mechs(void) {
  91         cprintf("<mechanisms xmlns=\"urn:ietf:params:xml:ns:xmpp-sasl\">");
  92         cprintf("<mechanism>PLAIN</mechanism>");
  93         cprintf("</mechanisms>");
  94 }
  95
  96 /*
  97  * Here we go ... client is trying to authenticate.
  98  */
  99 void xmpp_sasl_auth(char *sasl_auth_mech, char *authstring) {
 100
 101         if (strcasecmp(sasl_auth_mech, "PLAIN")) {
 102                 cprintf("<failure xmlns=\"urn:ietf:params:xml:ns:xmpp-sasl\">");
 103                 cprintf("<invalid-mechanism/>");
 104                 cprintf("</failure>");
 105                 return;
 106         }
 107
 108         if (CC->logged_in) logout(CC);  /* Client may try to log in twice.  Handle this. */
 109
 110         if (xmpp_auth_plain(authstring) == 0) {
 111                 cprintf("<success xmlns=\"urn:ietf:params:xml:ns:xmpp-sasl\"/>");
 112         }
 113
 114         else {
 115                 cprintf("<failure xmlns=\"urn:ietf:params:xml:ns:xmpp-sasl\">");
 116                 cprintf("<not-authorized/>");
 117                 cprintf("</failure>");
 118         }
 119 }
 120
 121
 122
 123 /*
 124  * Non-SASL authentication
 125  */
 126 void jabber_non_sasl_authenticate(char *iq_id, char *username, char *password, char *resource) {
 127         int result;
 128
 129         if (CC->logged_in) logout(CC);  /* Client may try to log in twice.  Handle this. */
 130
 131         result = CtdlLoginExistingUser(NULL, username);
 132         if (result == login_ok) {
 133                 result = CtdlTryPassword(password);
 134                 if (result == pass_ok) {
 135                         cprintf("<iq type=\"result\" id=\"%s\"></iq>", iq_id);  /* success */
 136                         return;
 137                 }
 138         }
 139
 140         /* failure */
 141         cprintf("<iq type=\"error\" id=\"%s\">", iq_id);
 142         cprintf("<error code=\"401\" type=\"auth\">"
 143                 "<not-authorized xmlns=\"urn:ietf:params:xml:ns:xmpp-stanzas\"/>"
 144                 "</error>"
 145                 "</iq>"
 146         );
 147 }
 148
 149
 150
 151 #endif  /* HAVE_EXPAT */