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 #ifndef LDAP_INITIALIZE
  46         if (fullname) safestrncpy(fullname, username, fullname_size);
  47
  48         ldserver = ldap_init(config.c_ldap_host, config.c_ldap_port);
  49         if (ldserver == NULL) {
  50                 syslog(LOG_ALERT, "LDAP: Could not connect to %s:%d : %s\n",
  51                         config.c_ldap_host, config.c_ldap_port,
  52                         strerror(errno)
  53                 );
  54                 return(errno);
  55         }
  56
  57         ldap_set_option(ldserver, LDAP_OPT_PROTOCOL_VERSION, &ctdl_require_ldap_version);
  58         ldap_set_option(ldserver, LDAP_OPT_REFERRALS, (void *)LDAP_OPT_OFF);
  59
  60         striplt(config.c_ldap_bind_dn);
  61         striplt(config.c_ldap_bind_pw);
  62         syslog(LOG_DEBUG, "LDAP bind DN: %s\n", config.c_ldap_bind_dn);
  63         i = ldap_simple_bind_s(ldserver,
  64                 (!IsEmptyStr(config.c_ldap_bind_dn) ? config.c_ldap_bind_dn : NULL),
  65                 (!IsEmptyStr(config.c_ldap_bind_pw) ? config.c_ldap_bind_pw : NULL)
  66         );
  67         if (i != LDAP_SUCCESS) {
  68                 syslog(LOG_ALERT, "LDAP: Cannot bind: %s (%d)\n", ldap_err2string(i), i);
  69                 return(i);
  70         }
  71 #else
  72         if (ldap_initialize(&ldserver, config.c_ldap_host))
  73         {
  74                 syslog(LOG_ALERT, "LDAP: Could not connect to %s:%d : %s\n",
  75                        config.c_ldap_host, config.c_ldap_port,
  76                        strerror(errno)
  77                         );
  78                 return(errno);
  79         }
  80
  81         striplt(config.c_ldap_bind_dn);
  82         striplt(config.c_ldap_bind_pw);
  83
  84         syslog(LOG_DEBUG, "LDAP bind DN: %s\n", config.c_ldap_bind_dn);
  85         i = ldap_simple_bind_s(ldserver,
  86                 (!IsEmptyStr(config.c_ldap_bind_dn) ? config.c_ldap_bind_dn : NULL),
  87                 (!IsEmptyStr(config.c_ldap_bind_pw) ? config.c_ldap_bind_pw : NULL)
  88         );
  89
  90         if (i != LDAP_SUCCESS) {
  91                 syslog(LOG_ALERT, "LDAP: Cannot bind: %s (%d)\n", ldap_err2string(i), i);
  92                 return(i);
  93         }
  94 #endif
  95
  96
  97         tv.tv_sec = 10;
  98         tv.tv_usec = 0;
  99
 100         if (config.c_auth_mode == AUTHMODE_LDAP_AD) {
 101                 sprintf(searchstring, "(sAMAccountName=%s)", username);
 102         }
 103         else {
 104                 sprintf(searchstring, "(&(objectclass=posixAccount)(uid=%s))", username);
 105         }
 106
 107         syslog(LOG_DEBUG, "LDAP search: %s\n", searchstring);
 108         (void) ldap_search_ext_s(
 109                 ldserver,                                       /* ld                           */
 110                 config.c_ldap_base_dn,                          /* base                         */
 111                 LDAP_SCOPE_SUBTREE,                             /* scope                        */
 112                 searchstring,                                   /* filter                       */
 113                 NULL,                                           /* attrs (all attributes)       */
 114                 0,                                              /* attrsonly (attrs + values)   */
 115                 NULL,                                           /* serverctrls (none)           */
 116                 NULL,                                           /* clientctrls (none)           */
 117                 &tv,                                            /* timeout                      */
 118                 1,                                              /* sizelimit (1 result max)     */
 119                 &search_result                                  /* res                          */
 120         );
 121
 122         /* Ignore the return value of ldap_search_ext_s().  Sometimes it returns an error even when
 123          * the search succeeds.  Instead, we check to see whether search_result is still NULL.
 124          */
 125         if (search_result == NULL) {
 126                 syslog(LOG_DEBUG, "LDAP search: zero results were returned\n");
 127                 ldap_unbind(ldserver);
 128                 return(2);
 129         }
 130
 131         /* At this point we've got at least one result from our query.  If there are multiple
 132          * results, we still only look at the first one.
 133          */
 134         entry = ldap_first_entry(ldserver, search_result);
 135         if (entry) {
 136
 137                 user_dn = ldap_get_dn(ldserver, entry);
 138                 if (user_dn) {
 139                         syslog(LOG_DEBUG, "dn = %s\n", user_dn);
 140                 }
 141
 142                 if (config.c_auth_mode == AUTHMODE_LDAP_AD) {
 143                         values = ldap_get_values(ldserver, search_result, "displayName");
 144                         if (values) {
 145                                 if (values[0]) {
 146                                         if (fullname) safestrncpy(fullname, values[0], fullname_size);
 147                                         syslog(LOG_DEBUG, "displayName = %s\n", values[0]);
 148                                 }
 149                                 ldap_value_free(values);
 150                         }
 151                 }
 152                 else {
 153                         values = ldap_get_values(ldserver, search_result, "cn");
 154                         if (values) {
 155                                 if (values[0]) {
 156                                         if (fullname) safestrncpy(fullname, values[0], fullname_size);
 157                                         syslog(LOG_DEBUG, "cn = %s\n", values[0]);
 158                                 }
 159                                 ldap_value_free(values);
 160                         }
 161                 }
 162
 163                 if (config.c_auth_mode == AUTHMODE_LDAP_AD) {
 164                         values = ldap_get_values(ldserver, search_result, "objectGUID");
 165                         if (values) {
 166                                 if (values[0]) {
 167                                         if (uid != NULL) {
 168                                                 *uid = abs(HashLittle(values[0], strlen(values[0])));
 169                                                 syslog(LOG_DEBUG, "uid hashed from objectGUID = %d\n", *uid);
 170                                         }
 171                                 }
 172                                 ldap_value_free(values);
 173                         }
 174                 }
 175                 else {
 176                         values = ldap_get_values(ldserver, search_result, "uidNumber");
 177                         if (values) {
 178                                 if (values[0]) {
 179                                         syslog(LOG_DEBUG, "uidNumber = %s\n", values[0]);
 180                                         if (uid != NULL) {
 181                                                 *uid = atoi(values[0]);
 182                                         }
 183                                 }
 184                                 ldap_value_free(values);
 185                         }
 186                 }
 187
 188         }
 189
 190         /* free the results */
 191         ldap_msgfree(search_result);
 192
 193         /* unbind so we can go back in as the authenticating user */
 194         ldap_unbind(ldserver);
 195
 196         if (!user_dn) {
 197                 syslog(LOG_DEBUG, "No such user was found.\n");
 198                 return(4);
 199         }
 200
 201         if (found_dn) safestrncpy(found_dn, user_dn, found_dn_size);
 202         ldap_memfree(user_dn);
 203         return(0);
 204 }
 205
 206
 207 int CtdlTryPasswordLDAP(char *user_dn, const char *password)
 208 {
 209         LDAP *ldserver = NULL;
 210         int i = (-1);
 211
 212         if (IsEmptyStr(password)) {
 213                 syslog(LOG_DEBUG, "LDAP: empty passwords are not permitted\n");
 214                 return(1);
 215         }
 216
 217         syslog(LOG_DEBUG, "LDAP: trying to bind as %s\n", user_dn);
 218         ldserver = ldap_init(config.c_ldap_host, config.c_ldap_port);
 219         if (ldserver) {
 220                 ldap_set_option(ldserver, LDAP_OPT_PROTOCOL_VERSION, &ctdl_require_ldap_version);
 221                 i = ldap_simple_bind_s(ldserver, user_dn, password);
 222                 if (i == LDAP_SUCCESS) {
 223                         syslog(LOG_DEBUG, "LDAP: bind succeeded\n");
 224                 }
 225                 else {
 226                         syslog(LOG_DEBUG, "LDAP: Cannot bind: %s (%d)\n", ldap_err2string(i), i);
 227                 }
 228                 ldap_set_option(ldserver, LDAP_OPT_REFERRALS, (void *)LDAP_OPT_OFF);
 229                 ldap_unbind(ldserver);
 230         }
 231
 232         if (i == LDAP_SUCCESS) {
 233                 return(0);
 234         }
 235
 236         return(1);
 237 }
 238
 239
 240 /*
 241  * Learn LDAP attributes and stuff them into the vCard.
 242  * Returns nonzero if we changed anything.
 243  */
 244 int Ctdl_LDAP_to_vCard(char *ldap_dn, struct vCard *v)
 245 {
 246         int changed_something = 0;
 247
 248         if (!ldap_dn) return(0);
 249         if (!v) return(0);
 250
 251         /*
 252          * FIXME this is a stub function
 253          *
 254          * ldap_dn will contain the DN of the user, and v will contain a pointer to
 255          * the vCard that needs to be (re-)populated.  Put the requisite LDAP code here.
 256          *
 257         vcard_set_prop(v, "email;internet", xxx, 0);
 258          *
 259          * return nonzero to tell the caller that we made changes that need to be saved
 260         changed_something = 1;
 261          *
 262          */
 263
 264         return(changed_something);      /* tell the caller whether we made any changes */
 265 }
 266
 267 #endif /* HAVE_LDAP */