src/ldaputil.c

   1 /*
   2  * Claws Mail -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 2003-2015 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
  40 #define SYLDAP_TEST_FILTER   "(objectclass=*)"
  41 #define SYLDAP_SEARCHBASE_V2 "cn=config"
  42 #define SYLDAP_SEARCHBASE_V3 ""
  43 #define SYLDAP_V2_TEST_ATTR  "database"
  44 #define SYLDAP_V3_TEST_ATTR  "namingcontexts"
  45
  46 /**
  47  * Attempt to discover the base DN for a server using LDAP version 3.
  48  * \param  ld  LDAP handle for a connected server.
  49  * \param  tov Timeout value (seconds), or 0 for none, default 30 secs.
  50  * \return List of Base DN's, or NULL if could not read. List should be
  51  *         g_free() when done.
  52  */
  53 static GList *ldaputil_test_v3( LDAP *ld, gint tov, gint *errcode ) {
  54         GList *baseDN = NULL;
  55         gint rc, i;
  56         LDAPMessage *result = NULL, *e;
  57         gchar *attribs[2];
  58         BerElement *ber;
  59         gchar *attribute;
  60         struct berval **vals;
  61         struct timeval timeout;
  62
  63         /* Set timeout */
  64         timeout.tv_usec = 0L;
  65         if( tov > 0 ) {
  66                 timeout.tv_sec = tov;
  67         }
  68         else {
  69                 timeout.tv_sec = 30L;
  70         }
  71
  72         /* Test for LDAP version 3 */
  73         attribs[0] = SYLDAP_V3_TEST_ATTR;
  74         attribs[1] = NULL;
  75         rc = ldap_search_ext_s(
  76                 ld, SYLDAP_SEARCHBASE_V3, LDAP_SCOPE_BASE, SYLDAP_TEST_FILTER,
  77                 attribs, 0, NULL, NULL, &timeout, 0, &result );
  78
  79         if( rc == LDAP_SUCCESS ) {
  80                 /* Process entries */
  81                 for( e = ldap_first_entry( ld, result );
  82                      e != NULL;
  83                      e = ldap_next_entry( ld, e ) )
  84                 {
  85                         /* Process attributes */
  86                         for( attribute = ldap_first_attribute( ld, e, &ber );
  87                              attribute != NULL;
  88                              attribute = ldap_next_attribute( ld, e, ber ) )
  89                         {
  90                                 if( strcasecmp(
  91                                         attribute, SYLDAP_V3_TEST_ATTR ) == 0 )
  92                                 {
  93                                         vals = ldap_get_values_len( ld, e, attribute );
  94                                         if( vals != NULL ) {
  95                                                 for( i = 0; vals[i] != NULL; i++ ) {
  96                                                         baseDN = g_list_append(
  97                                                                 baseDN, g_strndup( vals[i]->bv_val, vals[i]->bv_len ) );
  98                                                 }
  99                                         }
 100                                         ldap_value_free_len( vals );
 101                                 }
 102                                 ldap_memfree( attribute );
 103                         }
 104                         if( ber != NULL ) {
 105                                 ber_free( ber, 0 );
 106                         }
 107                         ber = NULL;
 108                 }
 109         } else
 110                 debug_print("LDAP: Error %d (%s)\n", rc, ldaputil_get_error(ld));
 111
 112         if (errcode)
 113                 *errcode = rc;
 114         if (result)
 115                 ldap_msgfree( result );
 116         return baseDN;
 117 }
 118
 119 /**
 120  * Attempt to discover the base DN for a server using LDAP version 2.
 121  * \param  ld  LDAP handle for a connected server.
 122  * \param  tov Timeout value (seconds), or 0 for none, default 30 secs.
 123  * \return List of Base DN's, or NULL if could not read. List should be
 124  *         g_free() when done.
 125  */
 126 static GList *ldaputil_test_v2( LDAP *ld, gint tov ) {
 127         GList *baseDN = NULL;
 128         gint rc, i;
 129         LDAPMessage *result = NULL, *e;
 130         gchar *attribs[1];
 131         BerElement *ber;
 132         gchar *attribute;
 133         struct berval **vals;
 134         struct timeval timeout;
 135
 136         /* Set timeout */
 137         timeout.tv_usec = 0L;
 138         if( tov > 0 ) {
 139                 timeout.tv_sec = tov;
 140         }
 141         else {
 142                 timeout.tv_sec = 30L;
 143         }
 144
 145         attribs[0] = NULL;
 146         rc = ldap_search_ext_s(
 147                 ld, SYLDAP_SEARCHBASE_V2, LDAP_SCOPE_BASE, SYLDAP_TEST_FILTER,
 148                 attribs, 0, NULL, NULL, &timeout, 0, &result );
 149
 150         if( rc == LDAP_SUCCESS ) {
 151                 /* Process entries */
 152                 for( e = ldap_first_entry( ld, result );
 153                      e != NULL;
 154                      e = ldap_next_entry( ld, e ) )
 155                 {
 156                         /* Process attributes */
 157                         for( attribute = ldap_first_attribute( ld, e, &ber );
 158                              attribute != NULL;
 159                              attribute = ldap_next_attribute( ld, e, ber ) )
 160                         {
 161                                 if( strcasecmp(
 162                                         attribute,
 163                                         SYLDAP_V2_TEST_ATTR ) == 0 ) {
 164                                         vals = ldap_get_values_len( ld, e, attribute );
 165                                         if( vals != NULL ) {
 166                                                 for( i = 0; vals[i] != NULL; i++ ) {
 167                                                         char *ch, *tmp;
 168                                                         /*
 169                                                          * Strip the 'ldb:' from the
 170                                                          * front of the value.
 171                                                          */
 172                                                         tmp = g_strndup( vals[i]->bv_val, vals[i]->bv_len);
 173                                                         ch = ( char * ) strchr( tmp, ':' );
 174                                                         if( ch ) {
 175                                                                 gchar *bn = g_strdup( ++ch );
 176                                                                 g_strstrip( bn );
 177                                                                 baseDN = g_list_append(
 178                                                                         baseDN, g_strdup( bn ) );
 179                                                                 g_free( bn );
 180                                                         }
 181                                                         g_free(tmp);
 182                                                 }
 183                                         }
 184                                         ldap_value_free_len( vals );
 185                                 }
 186                                 ldap_memfree( attribute );
 187                         }
 188                         if( ber != NULL ) {
 189                                 ber_free( ber, 0 );
 190                         }
 191                         ber = NULL;
 192                 }
 193         }
 194         if (result)
 195                 ldap_msgfree( result );
 196         return baseDN;
 197 }
 198
 199 int claws_ldap_simple_bind_s( LDAP *ld, LDAP_CONST char *dn, LDAP_CONST char *passwd )
 200 {
 201         debug_print("binding: DN->%s\n", dn?dn:"null");
 202 #ifdef G_OS_UNIX
 203         struct berval cred;
 204
 205         if ( passwd != NULL ) {
 206                 cred.bv_val = (char *) passwd;
 207                 cred.bv_len = strlen( passwd );
 208         } else {
 209                 cred.bv_val = "";
 210                 cred.bv_len = 0;
 211         }
 212
 213         return ldap_sasl_bind_s( ld, dn, LDAP_SASL_SIMPLE, &cred,
 214                 NULL, NULL, NULL );
 215 #else
 216         return ldap_simple_bind_s(ld, (PCHAR)dn, (PCHAR)passwd);
 217 #endif
 218 }
 219
 220 /**
 221  * Attempt to discover the base DN for the server.
 222  * \param  host   Host name.
 223  * \param  port   Port number.
 224  * \param  bindDN Bind DN (optional).
 225  * \param  bindPW Bind PW (optional).
 226  * \param  tov    Timeout value (seconds), or 0 for none, default 30 secs.
 227  * \return List of Base DN's, or NULL if could not read. This list should be
 228  *         g_free() when done.
 229  */
 230 GList *ldaputil_read_basedn(
 231                 const gchar *host, const gint port, const gchar *bindDN,
 232                 const gchar *bindPW, const gint tov, int ssl, int tls )
 233 {
 234         GList *baseDN = NULL;
 235         LDAP *ld = NULL;
 236         LdapControl *ctl = ldapctl_create();
 237         gint rc;
 238
 239         if( host == NULL )
 240                 return NULL;
 241         if( port < 1 )
 242                 return NULL;
 243
 244         ldapctl_set_tls(ctl, tls);
 245         ldapctl_set_ssl(ctl, ssl);
 246         ldapctl_set_port(ctl, port);
 247         ldapctl_set_host(ctl, host);
 248         ldapctl_set_timeout(ctl, tov);
 249         ldapctl_set_bind_dn(ctl, bindDN);
 250
 251         ld = ldapsvr_connect(ctl);
 252         if (ld == NULL) {
 253                 ldapctl_free(ctl);
 254                 return NULL;
 255         }
 256         baseDN = ldaputil_test_v3( ld, tov, &rc );
 257         if (baseDN)
 258                 debug_print("Using LDAP v3\n");
 259
 260 #ifdef G_OS_UNIX
 261         if( baseDN == NULL && !LDAP_API_ERROR(rc) ) {
 262 #else
 263         if( baseDN == NULL) {
 264 #endif
 265                 baseDN = ldaputil_test_v2( ld, tov );
 266                 if (baseDN)
 267                         debug_print("Using LDAP v2\n");
 268         }
 269         if (ld)
 270                 ldapsvr_disconnect(ld);
 271
 272         ldapctl_free(ctl);
 273
 274         return baseDN;
 275 }
 276
 277 /**
 278  * Attempt to connect to the server.
 279  * Enter:
 280  * \param  host Host name.
 281  * \param  port Port number.
 282  * \return <i>TRUE</i> if connected successfully.
 283  */
 284 gboolean ldaputil_test_connect( const gchar *host, const gint port, int ssl, int tls, int secs ) {
 285         gboolean retVal = FALSE;
 286         LdapControl *ctl = ldapctl_create();
 287         LDAP *ld;
 288
 289         ldapctl_set_tls(ctl, tls);
 290         ldapctl_set_ssl(ctl, ssl);
 291         ldapctl_set_port(ctl, port);
 292         ldapctl_set_host(ctl, host);
 293         ldapctl_set_timeout(ctl, secs);
 294
 295         ld = ldapsvr_connect(ctl);
 296         if( ld != NULL ) {
 297                 ldapsvr_disconnect(ld);
 298                 debug_print("ld != NULL\n");
 299                 retVal = TRUE;
 300         }
 301         ldapctl_free(ctl);
 302
 303         return retVal;
 304 }
 305
 306 /**
 307  * Test whether LDAP libraries installed.
 308  * Return: TRUE if library available.
 309  */
 310 gboolean ldaputil_test_ldap_lib( void ) {
 311         return TRUE;
 312 }
 313
 314 const gchar *ldaputil_get_error(LDAP *ld)
 315 {
 316         gchar *ld_error = NULL;
 317         static gchar error[512];
 318
 319         ldap_get_option( ld, LDAP_OPT_ERROR_STRING, &ld_error);
 320         if (ld_error != NULL)
 321                 strncpy2(error, ld_error, sizeof(error));
 322         else
 323                 strncpy2(error, _("Unknown error"), sizeof(error));
 324 #ifndef G_OS_WIN32
 325         /* From https://msdn.microsoft.com/en-us/library/aa366594%28v=vs.85%29.aspx
 326          * "LDAP_OPT_ERROR_STRING returns a pointer to an internal static
 327          * string table, and ldap_memfree should not be called when using
 328          * this session option."
 329          */
 330         ldap_memfree(ld_error);
 331 #endif
 332
 333         return error;
 334 }
 335 #endif  /* USE_LDAP */
 336
 337 /*
 338  * End of Source.
 339 */