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 <stdio.h>
  19 #include <libcitadel.h>
  20
  21 #include "citserver.h"
  22 #include "citadel_ldap.h"
  23 #include "ctdl_module.h"
  24
  25 #include "user_ops.h"
  26
  27 #ifdef HAVE_LDAP
  28 #define LDAP_DEPRECATED 1       /* Suppress libldap's warning that we are using deprecated API calls */
  29 #include <ldap.h>
  30
  31 int CtdlTryUserLDAP(char *username,
  32                 char *found_dn, int found_dn_size,
  33                 char *fullname, int fullname_size,
  34                 uid_t *uid)
  35 {
  36         LDAP *ldserver = NULL;
  37         int i;
  38         LDAPMessage *search_result = NULL;
  39         LDAPMessage *entry = NULL;
  40         char searchstring[1024];
  41         struct timeval tv;
  42         char **values;
  43         char *user_dn = NULL;
  44
  45         if (fullname) safestrncpy(fullname, username, fullname_size);
  46
  47         ldserver = ldap_init(config.c_ldap_host, config.c_ldap_port);
  48         if (ldserver == NULL) {
  49                 syslog(LOG_ALERT, "LDAP: Could not connect to %s:%d : %s\n",
  50                         config.c_ldap_host, config.c_ldap_port,
  51                         strerror(errno)
  52                 );
  53                 return(errno);
  54         }
  55
  56         ldap_set_option(ldserver, LDAP_OPT_PROTOCOL_VERSION, &ctdl_require_ldap_version);
  57         ldap_set_option(ldserver, LDAP_OPT_REFERRALS, (void *)LDAP_OPT_OFF);
  58
  59         striplt(config.c_ldap_bind_dn);
  60         striplt(config.c_ldap_bind_pw);
  61         syslog(LOG_DEBUG, "LDAP bind DN: %s\n", config.c_ldap_bind_dn);
  62         i = ldap_simple_bind_s(ldserver,
  63                 (!IsEmptyStr(config.c_ldap_bind_dn) ? config.c_ldap_bind_dn : NULL),
  64                 (!IsEmptyStr(config.c_ldap_bind_pw) ? config.c_ldap_bind_pw : NULL)
  65         );
  66         if (i != LDAP_SUCCESS) {
  67                 syslog(LOG_ALERT, "LDAP: Cannot bind: %s (%d)\n", ldap_err2string(i), i);
  68                 return(i);
  69         }
  70
  71         tv.tv_sec = 10;
  72         tv.tv_usec = 0;
  73
  74         if (config.c_auth_mode == AUTHMODE_LDAP_AD) {
  75                 sprintf(searchstring, "(sAMAccountName=%s)", username);
  76         }
  77         else {
  78                 sprintf(searchstring, "(&(objectclass=posixAccount)(uid=%s))", username);
  79         }
  80
  81         syslog(LOG_DEBUG, "LDAP search: %s\n", searchstring);
  82         (void) ldap_search_ext_s(
  83                 ldserver,                                       /* ld                           */
  84                 config.c_ldap_base_dn,                          /* base                         */
  85                 LDAP_SCOPE_SUBTREE,                             /* scope                        */
  86                 searchstring,                                   /* filter                       */
  87                 NULL,                                           /* attrs (all attributes)       */
  88                 0,                                              /* attrsonly (attrs + values)   */
  89                 NULL,                                           /* serverctrls (none)           */
  90                 NULL,                                           /* clientctrls (none)           */
  91                 &tv,                                            /* timeout                      */
  92                 1,                                              /* sizelimit (1 result max)     */
  93                 &search_result                                  /* res                          */
  94         );
  95
  96         /* Ignore the return value of ldap_search_ext_s().  Sometimes it returns an error even when
  97          * the search succeeds.  Instead, we check to see whether search_result is still NULL.
  98          */
  99         if (search_result == NULL) {
 100                 syslog(LOG_DEBUG, "LDAP search: zero results were returned\n");
 101                 ldap_unbind(ldserver);
 102                 return(2);
 103         }
 104
 105         /* At this point we've got at least one result from our query.  If there are multiple
 106          * results, we still only look at the first one.
 107          */
 108         entry = ldap_first_entry(ldserver, search_result);
 109         if (entry) {
 110
 111                 user_dn = ldap_get_dn(ldserver, entry);
 112                 if (user_dn) {
 113                         syslog(LOG_DEBUG, "dn = %s\n", user_dn);
 114                 }
 115
 116                 if (config.c_auth_mode == AUTHMODE_LDAP_AD) {
 117                         values = ldap_get_values(ldserver, search_result, "displayName");
 118                         if (values) {
 119                                 if (values[0]) {
 120                                         if (fullname) safestrncpy(fullname, values[0], fullname_size);
 121                                         syslog(LOG_DEBUG, "displayName = %s\n", values[0]);
 122                                 }
 123                                 ldap_value_free(values);
 124                         }
 125                 }
 126                 else {
 127                         values = ldap_get_values(ldserver, search_result, "cn");
 128                         if (values) {
 129                                 if (values[0]) {
 130                                         if (fullname) safestrncpy(fullname, values[0], fullname_size);
 131                                         syslog(LOG_DEBUG, "cn = %s\n", values[0]);
 132                                 }
 133                                 ldap_value_free(values);
 134                         }
 135                 }
 136
 137                 if (config.c_auth_mode == AUTHMODE_LDAP_AD) {
 138                         values = ldap_get_values(ldserver, search_result, "objectGUID");
 139                         if (values) {
 140                                 if (values[0]) {
 141                                         if (uid != NULL) {
 142                                                 *uid = abs(HashLittle(values[0], strlen(values[0])));
 143                                                 syslog(LOG_DEBUG, "uid hashed from objectGUID = %d\n", *uid);
 144                                         }
 145                                 }
 146                                 ldap_value_free(values);
 147                         }
 148                 }
 149                 else {
 150                         values = ldap_get_values(ldserver, search_result, "uidNumber");
 151                         if (values) {
 152                                 if (values[0]) {
 153                                         syslog(LOG_DEBUG, "uidNumber = %s\n", values[0]);
 154                                         if (uid != NULL) {
 155                                                 *uid = atoi(values[0]);
 156                                         }
 157                                 }
 158                                 ldap_value_free(values);
 159                         }
 160                 }
 161
 162         }
 163
 164         /* free the results */
 165         ldap_msgfree(search_result);
 166
 167         /* unbind so we can go back in as the authenticating user */
 168         ldap_unbind(ldserver);
 169
 170         if (!user_dn) {
 171                 syslog(LOG_DEBUG, "No such user was found.\n");
 172                 return(4);
 173         }
 174
 175         if (found_dn) safestrncpy(found_dn, user_dn, found_dn_size);
 176         ldap_memfree(user_dn);
 177         return(0);
 178 }
 179
 180
 181 int CtdlTryPasswordLDAP(char *user_dn, const char *password)
 182 {
 183         LDAP *ldserver = NULL;
 184         int i = (-1);
 185
 186         if (IsEmptyStr(password)) {
 187                 syslog(LOG_DEBUG, "LDAP: empty passwords are not permitted\n");
 188                 return(1);
 189         }
 190
 191         syslog(LOG_DEBUG, "LDAP: trying to bind as %s\n", user_dn);
 192         ldserver = ldap_init(config.c_ldap_host, config.c_ldap_port);
 193         if (ldserver) {
 194                 ldap_set_option(ldserver, LDAP_OPT_PROTOCOL_VERSION, &ctdl_require_ldap_version);
 195                 i = ldap_simple_bind_s(ldserver, user_dn, password);
 196                 if (i == LDAP_SUCCESS) {
 197                         syslog(LOG_DEBUG, "LDAP: bind succeeded\n");
 198                 }
 199                 else {
 200                         syslog(LOG_DEBUG, "LDAP: Cannot bind: %s (%d)\n", ldap_err2string(i), i);
 201                 }
 202                 ldap_set_option(ldserver, LDAP_OPT_REFERRALS, (void *)LDAP_OPT_OFF);
 203                 ldap_unbind(ldserver);
 204         }
 205
 206         if (i == LDAP_SUCCESS) {
 207                 return(0);
 208         }
 209
 210         return(1);
 211 }
 212
 213
 214 /*
 215  * Learn LDAP attributes and stuff them into the vCard.
 216  * Returns nonzero if we changed anything.
 217  */
 218 int Ctdl_LDAP_to_vCard(char *ldap_dn, struct vCard *v)
 219 {
 220         int changed_something = 0;
 221
 222         if (!ldap_dn) return(0);
 223         if (!v) return(0);
 224
 225         /*
 226          * FIXME this is a stub function
 227          *
 228          * ldap_dn will contain the DN of the user, and v will contain a pointer to
 229          * the vCard that needs to be (re-)populated.  Put the requisite LDAP code here.
 230          *
 231         vcard_set_prop(v, "email;internet", xxx, 0);
 232          *
 233          * return nonzero to tell the caller that we made changes that need to be saved
 234         changed_something = 1;
 235          *
 236          */
 237
 238         return(changed_something);      /* tell the caller whether we made any changes */
 239 }
 240
 241 #endif /* HAVE_LDAP */