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) 2010 by Art Cancro and the citadel.org development team.
   6  *
   7  * This program is free 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         i = ldap_search_ext_s(ldserver,                         /* ld                           */
 128                 config.c_ldap_base_dn,                          /* base                         */
 129                 LDAP_SCOPE_SUBTREE,                             /* scope                        */
 130                 searchstring,                                   /* filter                       */
 131                 NULL,                                           /* attrs (all attributes)       */
 132                 0,                                              /* attrsonly (attrs + values)   */
 133                 NULL,                                           /* serverctrls (none)           */
 134                 NULL,                                           /* clientctrls (none)           */
 135                 &tv,                                            /* timeout                      */
 136                 1,                                              /* sizelimit (1 result max)     */
 137                 &search_result                                  /* res                          */
 138         );
 139
 140         /* Ignore the return value of ldap_search_ext_s().  Sometimes it returns an error even when
 141          * the search succeeds.  Instead, we check to see whether search_result is still NULL.
 142          */
 143         if (search_result == NULL) {
 144                 syslog(LOG_DEBUG, "LDAP search: zero results were returned\n");
 145                 ldap_unbind(ldserver);
 146                 return(2);
 147         }
 148
 149         /* At this point we've got at least one result from our query.  If there are multiple
 150          * results, we still only look at the first one.
 151          */
 152         entry = ldap_first_entry(ldserver, search_result);
 153         if (entry) {
 154
 155                 user_dn = ldap_get_dn(ldserver, entry);
 156                 if (user_dn) {
 157                         syslog(LOG_DEBUG, "dn = %s\n", user_dn);
 158                 }
 159
 160                 if (config.c_auth_mode == AUTHMODE_LDAP_AD) {
 161                         values = ldap_get_values(ldserver, search_result, "displayName");
 162                         if (values) {
 163                                 if (values[0]) {
 164                                         if (fullname) safestrncpy(fullname, values[0], fullname_size);
 165                                         syslog(LOG_DEBUG, "displayName = %s\n", values[0]);
 166                                 }
 167                                 ldap_value_free(values);
 168                         }
 169                 }
 170                 else {
 171                         values = ldap_get_values(ldserver, search_result, "cn");
 172                         if (values) {
 173                                 if (values[0]) {
 174                                         if (fullname) safestrncpy(fullname, values[0], fullname_size);
 175                                         syslog(LOG_DEBUG, "cn = %s\n", values[0]);
 176                                 }
 177                                 ldap_value_free(values);
 178                         }
 179                 }
 180
 181                 if (config.c_auth_mode == AUTHMODE_LDAP_AD) {
 182                         values = ldap_get_values(ldserver, search_result, "objectGUID");
 183                         if (values) {
 184                                 if (values[0]) {
 185                                         if (uid != NULL) {
 186                                                 *uid = abs(HashLittle(values[0], strlen(values[0])));
 187                                                 syslog(LOG_DEBUG, "uid hashed from objectGUID = %d\n", *uid);
 188                                         }
 189                                 }
 190                                 ldap_value_free(values);
 191                         }
 192                 }
 193                 else {
 194                         values = ldap_get_values(ldserver, search_result, "uidNumber");
 195                         if (values) {
 196                                 if (values[0]) {
 197                                         syslog(LOG_DEBUG, "uidNumber = %s\n", values[0]);
 198                                         if (uid != NULL) {
 199                                                 *uid = atoi(values[0]);
 200                                         }
 201                                 }
 202                                 ldap_value_free(values);
 203                         }
 204                 }
 205
 206         }
 207
 208         /* free the results */
 209         ldap_msgfree(search_result);
 210
 211         /* unbind so we can go back in as the authenticating user */
 212         ldap_unbind(ldserver);
 213
 214         if (!user_dn) {
 215                 syslog(LOG_DEBUG, "No such user was found.\n");
 216                 return(4);
 217         }
 218
 219         if (found_dn) safestrncpy(found_dn, user_dn, found_dn_size);
 220         ldap_memfree(user_dn);
 221         return(0);
 222 }
 223
 224
 225 int CtdlTryPasswordLDAP(char *user_dn, const char *password)
 226 {
 227         LDAP *ldserver = NULL;
 228         int i = (-1);
 229
 230         if (IsEmptyStr(password)) {
 231                 syslog(LOG_DEBUG, "LDAP: empty passwords are not permitted\n");
 232                 return(1);
 233         }
 234
 235         syslog(LOG_DEBUG, "LDAP: trying to bind as %s\n", user_dn);
 236         ldserver = ldap_init(config.c_ldap_host, config.c_ldap_port);
 237         if (ldserver) {
 238                 ldap_set_option(ldserver, LDAP_OPT_PROTOCOL_VERSION, &ctdl_require_ldap_version);
 239                 i = ldap_simple_bind_s(ldserver, user_dn, password);
 240                 if (i == LDAP_SUCCESS) {
 241                         syslog(LOG_DEBUG, "LDAP: bind succeeded\n");
 242                 }
 243                 else {
 244                         syslog(LOG_DEBUG, "LDAP: Cannot bind: %s (%d)\n", ldap_err2string(i), i);
 245                 }
 246                 ldap_set_option(ldserver, LDAP_OPT_REFERRALS, (void *)LDAP_OPT_OFF);
 247                 ldap_unbind(ldserver);
 248         }
 249
 250         if (i == LDAP_SUCCESS) {
 251                 return(0);
 252         }
 253
 254         return(1);
 255 }
 256
 257
 258 /*
 259  * Learn LDAP attributes and stuff them into the vCard.
 260  * Returns nonzero if we changed anything.
 261  */
 262 int Ctdl_LDAP_to_vCard(char *ldap_dn, struct vCard *v)
 263 {
 264         int changed_something = 0;
 265
 266         if (!ldap_dn) return(0);
 267         if (!v) return(0);
 268
 269         /*
 270          * FIXME this is a stub function
 271          *
 272          * ldap_dn will contain the DN of the user, and v will contain a pointer to
 273          * the vCard that needs to be (re-)populated.  Put the requisite LDAP code here.
 274          *
 275         vcard_set_prop(v, "email;internet", xxx, 0);
 276          *
 277          * return nonzero to tell the caller that we made changes that need to be saved
 278         changed_something = 1;
 279          *
 280          */
 281
 282         return(changed_something);      /* tell the caller whether we made any changes */
 283 }
 284
 285 #endif /* HAVE_LDAP */