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