src/ldaputil.c

   1 /*
   2  * Claws Mail -- a GTK based, lightweight, and fast e-mail client
   3  * Copyright (C) 2003-2018 Match Grun and the Claws Mail team
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 3 of the License, or
   8  * (at your option) any later version.
   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  * You should have received a copy of the GNU General Public License
  16  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 /*
  20  * Some utility functions to access LDAP servers.
  21  */
  22
  23 #ifdef HAVE_CONFIG_H
  24 #  include "config.h"
  25 #include "claws-features.h"
  26 #endif
  27
  28 #ifdef USE_LDAP
  29
  30 #include <glib.h>
  31 #include <glib/gi18n.h>
  32 #include <string.h>
  33 #include <sys/time.h>
  34 #include <errno.h>
  35 #include "common/utils.h"
  36 #include "ldaputil.h"
  37 #include "ldapserver.h"
  38 #include "ldapctrl.h"
  39 #include "log.h"
  40
  41 #define SYLDAP_TEST_FILTER   "(objectclass=*)"
  42 #define SYLDAP_SEARCHBASE_V2 "cn=config"
  43 #define SYLDAP_SEARCHBASE_V3 ""
  44 #define SYLDAP_V2_TEST_ATTR  "database"
  45 #define SYLDAP_V3_TEST_ATTR  "namingcontexts"
  46
  47 /**
  48  * Attempt to discover the base DN for a server using LDAP version 3.
  49  * \param  ld  LDAP handle for a connected server.
  50  * \param  tov Timeout value (seconds), or 0 for none, default 30 secs.
  51  * \return List of Base DN's, or NULL if could not read. List should be
  52  *         g_free() when done.
  53  */
  54 static GList *ldaputil_test_v3( LDAP *ld, gint tov, gint *errcode ) {
  55         GList *baseDN = NULL;
  56         gint rc, i;
  57         LDAPMessage *result = NULL, *e;
  58         gchar *attribs[2];
  59         BerElement *ber;
  60         gchar *attribute;
  61         struct berval **vals;
  62         struct timeval timeout;
  63
  64         /* Set timeout */
  65         timeout.tv_usec = 0L;
  66         if( tov > 0 ) {
  67                 timeout.tv_sec = tov;
  68         }
  69         else {
  70                 timeout.tv_sec = 30L;
  71         }
  72
  73         /* Test for LDAP version 3 */
  74         attribs[0] = SYLDAP_V3_TEST_ATTR;
  75         attribs[1] = NULL;
  76         rc = ldap_search_ext_s(
  77                 ld, SYLDAP_SEARCHBASE_V3, LDAP_SCOPE_BASE, SYLDAP_TEST_FILTER,
  78                 attribs, 0, NULL, NULL, &timeout, 0, &result );
  79
  80         if( rc == LDAP_SUCCESS ) {
  81                 log_print(LOG_PROTOCOL, _("LDAP (search): successful\n"));
  82                 /* Process entries */
  83                 for( e = ldap_first_entry( ld, result );
  84                      e != NULL;
  85                      e = ldap_next_entry( ld, e ) )
  86                 {
  87                         /* Process attributes */
  88                         for( attribute = ldap_first_attribute( ld, e, &ber );
  89                              attribute != NULL;
  90                              attribute = ldap_next_attribute( ld, e, ber ) )
  91                         {
  92                                 if( strcasecmp(
  93                                         attribute, SYLDAP_V3_TEST_ATTR ) == 0 )
  94                                 {
  95                                         vals = ldap_get_values_len( ld, e, attribute );
  96                                         if( vals != NULL ) {
  97                                                 for( i = 0; vals[i] != NULL; i++ ) {
  98                                                         baseDN = g_list_append(
  99                                                                 baseDN, g_strndup( vals[i]->bv_val, vals[i]->bv_len ) );
 100                                                 }
 101                                         }
 102                                         ldap_value_free_len( vals );
 103                                 }
 104                                 ldap_memfree( attribute );
 105                         }
 106                         if( ber != NULL ) {
 107                                 ber_free( ber, 0 );
 108                         }
 109                         ber = NULL;
 110                 }
 111         } else {
 112                 log_error(LOG_PROTOCOL, _("LDAP error (search): %d (%s)\n"),
 113                                 rc, ldaputil_get_error(ld));
 114                 debug_print("LDAP: Error %d (%s)\n", rc, ldaputil_get_error(ld));
 115         }
 116
 117         if (errcode)
 118                 *errcode = rc;
 119         if (result)
 120                 ldap_msgfree( result );
 121         return baseDN;
 122 }
 123
 124 /**
 125  * Attempt to discover the base DN for a server using LDAP version 2.
 126  * \param  ld  LDAP handle for a connected server.
 127  * \param  tov Timeout value (seconds), or 0 for none, default 30 secs.
 128  * \return List of Base DN's, or NULL if could not read. List should be
 129  *         g_free() when done.
 130  */
 131 static GList *ldaputil_test_v2( LDAP *ld, gint tov ) {
 132         GList *baseDN = NULL;
 133         gint rc, i;
 134         LDAPMessage *result = NULL, *e;
 135         gchar *attribs[1];
 136         BerElement *ber;
 137         gchar *attribute;
 138         struct berval **vals;
 139         struct timeval timeout;
 140
 141         /* Set timeout */
 142         timeout.tv_usec = 0L;
 143         if( tov > 0 ) {
 144                 timeout.tv_sec = tov;
 145         }
 146         else {
 147                 timeout.tv_sec = 30L;
 148         }
 149
 150         attribs[0] = NULL;
 151         rc = ldap_search_ext_s(
 152                 ld, SYLDAP_SEARCHBASE_V2, LDAP_SCOPE_BASE, SYLDAP_TEST_FILTER,
 153                 attribs, 0, NULL, NULL, &timeout, 0, &result );
 154
 155         if( rc == LDAP_SUCCESS ) {
 156                 log_print(LOG_PROTOCOL, _("LDAP (search): successful\n"));
 157                 /* Process entries */
 158                 for( e = ldap_first_entry( ld, result );
 159                      e != NULL;
 160                      e = ldap_next_entry( ld, e ) )
 161                 {
 162                         /* Process attributes */
 163                         for( attribute = ldap_first_attribute( ld, e, &ber );
 164                              attribute != NULL;
 165                              attribute = ldap_next_attribute( ld, e, ber ) )
 166                         {
 167                                 if( strcasecmp(
 168                                         attribute,
 169                                         SYLDAP_V2_TEST_ATTR ) == 0 ) {
 170                                         vals = ldap_get_values_len( ld, e, attribute );
 171                                         if( vals != NULL ) {
 172                                                 for( i = 0; vals[i] != NULL; i++ ) {
 173                                                         char *ch, *tmp;
 174                                                         /*
 175                                                          * Strip the 'ldb:' from the
 176                                                          * front of the value.
 177                                                          */
 178                                                         tmp = g_strndup( vals[i]->bv_val, vals[i]->bv_len);
 179                                                         ch = ( char * ) strchr( tmp, ':' );
 180                                                         if( ch ) {
 181                                                                 gchar *bn = g_strdup( ++ch );
 182                                                                 g_strstrip( bn );
 183                                                                 baseDN = g_list_append(
 184                                                                         baseDN, g_strdup( bn ) );
 185                                                                 g_free( bn );
 186                                                         }
 187                                                         g_free(tmp);
 188                                                 }
 189                                         }
 190                                         ldap_value_free_len( vals );
 191                                 }
 192                                 ldap_memfree( attribute );
 193                         }
 194                         if( ber != NULL ) {
 195                                 ber_free( ber, 0 );
 196                         }
 197                         ber = NULL;
 198                 }
 199         } else {
 200                 log_error(LOG_PROTOCOL, _("LDAP error (search): %d (%s)\n"),
 201                                 rc, ldaputil_get_error(ld));
 202                 debug_print("LDAP: Error %d (%s)\n", rc, ldaputil_get_error(ld));
 203         }
 204         if (result)
 205                 ldap_msgfree( result );
 206         return baseDN;
 207 }
 208
 209 int claws_ldap_simple_bind_s( LDAP *ld, LDAP_CONST char *dn, LDAP_CONST char *passwd )
 210 {
 211         debug_print("binding: DN->%s\n", dn?dn:"null");
 212 #ifdef G_OS_UNIX
 213         struct berval cred;
 214
 215         if ( passwd != NULL ) {
 216                 cred.bv_val = (char *) passwd;
 217                 cred.bv_len = strlen( passwd );
 218         } else {
 219                 cred.bv_val = "";
 220                 cred.bv_len = 0;
 221         }
 222
 223         return ldap_sasl_bind_s( ld, dn, LDAP_SASL_SIMPLE, &cred,
 224                 NULL, NULL, NULL );
 225 #else
 226         return ldap_simple_bind_s(ld, (PCHAR)dn, (PCHAR)passwd);
 227 #endif
 228 }
 229
 230 /**
 231  * Attempt to discover the base DN for the server.
 232  * \param  host   Host name.
 233  * \param  port   Port number.
 234  * \param  bindDN Bind DN (optional).
 235  * \param  bindPW Bind PW (optional).
 236  * \param  tov    Timeout value (seconds), or 0 for none, default 30 secs.
 237  * \return List of Base DN's, or NULL if could not read. This list should be
 238  *         g_free() when done.
 239  */
 240 GList *ldaputil_read_basedn(
 241                 const gchar *host, const gint port, const gchar *bindDN,
 242                 const gchar *bindPW, const gint tov, int ssl, int tls )
 243 {
 244         GList *baseDN = NULL;
 245         LDAP *ld = NULL;
 246         LdapControl *ctl;
 247         gint rc;
 248
 249         if( host == NULL )
 250                 return NULL;
 251         if( port < 1 )
 252                 return NULL;
 253
 254     ctl = ldapctl_create();
 255         ldapctl_set_tls(ctl, tls);
 256         ldapctl_set_ssl(ctl, ssl);
 257         ldapctl_set_port(ctl, port);
 258         ldapctl_set_host(ctl, host);
 259         ldapctl_set_timeout(ctl, tov);
 260         ldapctl_set_bind_dn(ctl, bindDN);
 261
 262         ld = ldapsvr_connect(ctl);
 263         if (ld == NULL) {
 264                 ldapctl_free(ctl);
 265                 return NULL;
 266         }
 267         baseDN = ldaputil_test_v3( ld, tov, &rc );
 268         if (baseDN)
 269                 debug_print("Using LDAP v3\n");
 270
 271 #ifdef G_OS_UNIX
 272         if( baseDN == NULL && !LDAP_API_ERROR(rc) ) {
 273 #else
 274         if( baseDN == NULL) {
 275 #endif
 276                 baseDN = ldaputil_test_v2( ld, tov );
 277                 if (baseDN)
 278                         debug_print("Using LDAP v2\n");
 279         }
 280         if (ld)
 281                 ldapsvr_disconnect(ld);
 282
 283         ldapctl_free(ctl);
 284
 285         return baseDN;
 286 }
 287
 288 /**
 289  * Attempt to connect to the server.
 290  * Enter:
 291  * \param  host Host name.
 292  * \param  port Port number.
 293  * \return <i>TRUE</i> if connected successfully.
 294  */
 295 gboolean ldaputil_test_connect( const gchar *host, const gint port, int ssl, int tls, int secs ) {
 296         gboolean retVal = FALSE;
 297         LdapControl *ctl = ldapctl_create();
 298         LDAP *ld;
 299
 300         ldapctl_set_tls(ctl, tls);
 301         ldapctl_set_ssl(ctl, ssl);
 302         ldapctl_set_port(ctl, port);
 303         ldapctl_set_host(ctl, host);
 304         ldapctl_set_timeout(ctl, secs);
 305
 306         ld = ldapsvr_connect(ctl);
 307         if( ld != NULL ) {
 308                 ldapsvr_disconnect(ld);
 309                 debug_print("ld != NULL\n");
 310                 retVal = TRUE;
 311         }
 312         ldapctl_free(ctl);
 313
 314         return retVal;
 315 }
 316
 317 /**
 318  * Test whether LDAP libraries installed.
 319  * Return: TRUE if library available.
 320  */
 321 gboolean ldaputil_test_ldap_lib( void ) {
 322         return TRUE;
 323 }
 324
 325 const gchar *ldaputil_get_error(LDAP *ld)
 326 {
 327         gchar *ld_error = NULL;
 328         static gchar error[512];
 329
 330         ldap_get_option( ld, LDAP_OPT_ERROR_STRING, &ld_error);
 331         if (ld_error != NULL)
 332                 strncpy2(error, ld_error, sizeof(error));
 333         else
 334                 strncpy2(error, _("Unknown error"), sizeof(error));
 335 #ifndef G_OS_WIN32
 336         /* From https://msdn.microsoft.com/en-us/library/aa366594%28v=vs.85%29.aspx
 337          * "LDAP_OPT_ERROR_STRING returns a pointer to an internal static
 338          * string table, and ldap_memfree should not be called when using
 339          * this session option."
 340          */
 341         ldap_memfree(ld_error);
 342 #endif
 343
 344         return error;
 345 }
 346 #endif  /* USE_LDAP */
 347
 348 /*
 349  * End of Source.
 350 */