citadel/ldap.c

   1 /*
   2  * These functions implement the portions of AUTHMODE_LDAP and AUTHMODE_LDAP_AD which
   3  * actually speak to the LDAP server.
   4  *
   5  * Copyright (c) 2011 by Art Cancro and the citadel.org development team.
   6  *
   7  * This program is open source software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 3 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 int ctdl_require_ldap_version = 3;
  23
  24 #include "sysdep.h"
  25 #include <errno.h>
  26 #include <stdlib.h>
  27 #include <unistd.h>
  28 #include <stdio.h>
  29 #include <fcntl.h>
  30 #include <signal.h>
  31 #include <pwd.h>
  32 #include <ctype.h>
  33 #include <sys/types.h>
  34 #include <sys/wait.h>
  35 #ifdef HAVE_SYS_STAT_H
  36 #include <sys/stat.h>
  37 #endif
  38
  39 #if TIME_WITH_SYS_TIME
  40 # include <sys/time.h>
  41 # include <time.h>
  42 #else
  43 # if HAVE_SYS_TIME_H
  44 #  include <sys/time.h>
  45 # else
  46 #  include <time.h>
  47 # endif
  48 #endif
  49
  50 #include <string.h>
  51 #include <limits.h>
  52 #include <libcitadel.h>
  53 #include "auth.h"
  54 #include "citadel.h"
  55 #include "server.h"
  56 #include "database.h"
  57 #include "sysdep_decls.h"
  58 #include "support.h"
  59 #include "room_ops.h"
  60 #include "file_ops.h"
  61 #include "control.h"
  62 #include "msgbase.h"
  63 #include "config.h"
  64 #include "citserver.h"
  65 #include "citadel_dirs.h"
  66 #include "genstamp.h"
  67 #include "threads.h"
  68 #include "citadel_ldap.h"
  69 #include "ctdl_module.h"
  70 #include "user_ops.h"
  71
  72 #ifdef HAVE_LDAP
  73 #define LDAP_DEPRECATED 1       /* Suppress libldap's warning that we are using deprecated API calls */
  74 #include <ldap.h>
  75
  76 int CtdlTryUserLDAP(char *username,
  77                 char *found_dn, int found_dn_size,
  78                 char *fullname, int fullname_size,
  79                 uid_t *uid)
  80 {
  81         LDAP *ldserver = NULL;
  82         int i;
  83         LDAPMessage *search_result = NULL;
  84         LDAPMessage *entry = NULL;
  85         char searchstring[1024];
  86         struct timeval tv;
  87         char **values;
  88         char *user_dn = NULL;
  89
  90         if (fullname) safestrncpy(fullname, username, fullname_size);
  91
  92         ldserver = ldap_init(config.c_ldap_host, config.c_ldap_port);
  93         if (ldserver == NULL) {
  94                 syslog(LOG_ALERT, "LDAP: Could not connect to %s:%d : %s\n",
  95                         config.c_ldap_host, config.c_ldap_port,
  96                         strerror(errno)
  97                 );
  98                 return(errno);
  99         }
 100
 101         ldap_set_option(ldserver, LDAP_OPT_PROTOCOL_VERSION, &ctdl_require_ldap_version);
 102         ldap_set_option(ldserver, LDAP_OPT_REFERRALS, (void *)LDAP_OPT_OFF);
 103
 104         striplt(config.c_ldap_bind_dn);
 105         striplt(config.c_ldap_bind_pw);
 106         syslog(LOG_DEBUG, "LDAP bind DN: %s\n", config.c_ldap_bind_dn);
 107         i = ldap_simple_bind_s(ldserver,
 108                 (!IsEmptyStr(config.c_ldap_bind_dn) ? config.c_ldap_bind_dn : NULL),
 109                 (!IsEmptyStr(config.c_ldap_bind_pw) ? config.c_ldap_bind_pw : NULL)
 110         );
 111         if (i != LDAP_SUCCESS) {
 112                 syslog(LOG_ALERT, "LDAP: Cannot bind: %s (%d)\n", ldap_err2string(i), i);
 113                 return(i);
 114         }
 115
 116         tv.tv_sec = 10;
 117         tv.tv_usec = 0;
 118
 119         if (config.c_auth_mode == AUTHMODE_LDAP_AD) {
 120                 sprintf(searchstring, "(sAMAccountName=%s)", username);
 121         }
 122         else {
 123                 sprintf(searchstring, "(&(objectclass=posixAccount)(uid=%s))", username);
 124         }
 125
 126         syslog(LOG_DEBUG, "LDAP search: %s\n", searchstring);
 127         (void) ldap_search_ext_s(
 128                 ldserver,                                       /* ld                           */
 129                 config.c_ldap_base_dn,                          /* base                         */
 130                 LDAP_SCOPE_SUBTREE,                             /* scope                        */
 131                 searchstring,                                   /* filter                       */
 132                 NULL,                                           /* attrs (all attributes)       */
 133                 0,                                              /* attrsonly (attrs + values)   */
 134                 NULL,                                           /* serverctrls (none)           */
 135                 NULL,                                           /* clientctrls (none)           */
 136                 &tv,                                            /* timeout                      */
 137                 1,                                              /* sizelimit (1 result max)     */
 138                 &search_result                                  /* res                          */
 139         );
 140
 141         /* Ignore the return value of ldap_search_ext_s().  Sometimes it returns an error even when
 142          * the search succeeds.  Instead, we check to see whether search_result is still NULL.
 143          */
 144         if (search_result == NULL) {
 145                 syslog(LOG_DEBUG, "LDAP search: zero results were returned\n");
 146                 ldap_unbind(ldserver);
 147                 return(2);
 148         }
 149
 150         /* At this point we've got at least one result from our query.  If there are multiple
 151          * results, we still only look at the first one.
 152          */
 153         entry = ldap_first_entry(ldserver, search_result);
 154         if (entry) {
 155
 156                 user_dn = ldap_get_dn(ldserver, entry);
 157                 if (user_dn) {
 158                         syslog(LOG_DEBUG, "dn = %s\n", user_dn);
 159                 }
 160
 161                 if (config.c_auth_mode == AUTHMODE_LDAP_AD) {
 162                         values = ldap_get_values(ldserver, search_result, "displayName");
 163                         if (values) {
 164                                 if (values[0]) {
 165                                         if (fullname) safestrncpy(fullname, values[0], fullname_size);
 166                                         syslog(LOG_DEBUG, "displayName = %s\n", values[0]);
 167                                 }
 168                                 ldap_value_free(values);
 169                         }
 170                 }
 171                 else {
 172                         values = ldap_get_values(ldserver, search_result, "cn");
 173                         if (values) {
 174                                 if (values[0]) {
 175                                         if (fullname) safestrncpy(fullname, values[0], fullname_size);
 176                                         syslog(LOG_DEBUG, "cn = %s\n", values[0]);
 177                                 }
 178                                 ldap_value_free(values);
 179                         }
 180                 }
 181
 182                 if (config.c_auth_mode == AUTHMODE_LDAP_AD) {
 183                         values = ldap_get_values(ldserver, search_result, "objectGUID");
 184                         if (values) {
 185                                 if (values[0]) {
 186                                         if (uid != NULL) {
 187                                                 *uid = abs(HashLittle(values[0], strlen(values[0])));
 188                                                 syslog(LOG_DEBUG, "uid hashed from objectGUID = %d\n", *uid);
 189                                         }
 190                                 }
 191                                 ldap_value_free(values);
 192                         }
 193                 }
 194                 else {
 195                         values = ldap_get_values(ldserver, search_result, "uidNumber");
 196                         if (values) {
 197                                 if (values[0]) {
 198                                         syslog(LOG_DEBUG, "uidNumber = %s\n", values[0]);
 199                                         if (uid != NULL) {
 200                                                 *uid = atoi(values[0]);
 201                                         }
 202                                 }
 203                                 ldap_value_free(values);
 204                         }
 205                 }
 206
 207         }
 208
 209         /* free the results */
 210         ldap_msgfree(search_result);
 211
 212         /* unbind so we can go back in as the authenticating user */
 213         ldap_unbind(ldserver);
 214
 215         if (!user_dn) {
 216                 syslog(LOG_DEBUG, "No such user was found.\n");
 217                 return(4);
 218         }
 219
 220         if (found_dn) safestrncpy(found_dn, user_dn, found_dn_size);
 221         ldap_memfree(user_dn);
 222         return(0);
 223 }
 224
 225
 226 int CtdlTryPasswordLDAP(char *user_dn, const char *password)
 227 {
 228         LDAP *ldserver = NULL;
 229         int i = (-1);
 230
 231         if (IsEmptyStr(password)) {
 232                 syslog(LOG_DEBUG, "LDAP: empty passwords are not permitted\n");
 233                 return(1);
 234         }
 235
 236         syslog(LOG_DEBUG, "LDAP: trying to bind as %s\n", user_dn);
 237         ldserver = ldap_init(config.c_ldap_host, config.c_ldap_port);
 238         if (ldserver) {
 239                 ldap_set_option(ldserver, LDAP_OPT_PROTOCOL_VERSION, &ctdl_require_ldap_version);
 240                 i = ldap_simple_bind_s(ldserver, user_dn, password);
 241                 if (i == LDAP_SUCCESS) {
 242                         syslog(LOG_DEBUG, "LDAP: bind succeeded\n");
 243                 }
 244                 else {
 245                         syslog(LOG_DEBUG, "LDAP: Cannot bind: %s (%d)\n", ldap_err2string(i), i);
 246                 }
 247                 ldap_set_option(ldserver, LDAP_OPT_REFERRALS, (void *)LDAP_OPT_OFF);
 248                 ldap_unbind(ldserver);
 249         }
 250
 251         if (i == LDAP_SUCCESS) {
 252                 return(0);
 253         }
 254
 255         return(1);
 256 }
 257
 258
 259 /*
 260  * Learn LDAP attributes and stuff them into the vCard.
 261  * Returns nonzero if we changed anything.
 262  */
 263 int Ctdl_LDAP_to_vCard(char *ldap_dn, struct vCard *v)
 264 {
 265         int changed_something = 0;
 266
 267         if (!ldap_dn) return(0);
 268         if (!v) return(0);
 269
 270         /*
 271          * FIXME this is a stub function
 272          *
 273          * ldap_dn will contain the DN of the user, and v will contain a pointer to
 274          * the vCard that needs to be (re-)populated.  Put the requisite LDAP code here.
 275          *
 276         vcard_set_prop(v, "email;internet", xxx, 0);
 277          *
 278          * return nonzero to tell the caller that we made changes that need to be saved
 279         changed_something = 1;
 280          *
 281          */
 282
 283         return(changed_something);      /* tell the caller whether we made any changes */
 284 }
 285
 286 #endif /* HAVE_LDAP */