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