src/ldaputil.c

   1 /*
   2  * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 2003-2012 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 /*
  21  * Some utility functions to access LDAP servers.
  22  */
  23
  24 #ifdef HAVE_CONFIG_H
  25 #  include "config.h"
  26 #include "claws-features.h"
  27 #endif
  28
  29 #ifdef USE_LDAP
  30
  31 #include <glib.h>
  32 #include <glib/gi18n.h>
  33 #include <string.h>
  34 #include <sys/time.h>
  35 #include <errno.h>
  36 #include "common/utils.h"
  37 #include "ldaputil.h"
  38 #include "ldapserver.h"
  39 #include "ldapctrl.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                 /* Process entries */
  82                 for( e = ldap_first_entry( ld, result );
  83                      e != NULL;
  84                      e = ldap_next_entry( ld, e ) )
  85                 {
  86                         /* Process attributes */
  87                         for( attribute = ldap_first_attribute( ld, e, &ber );
  88                              attribute != NULL;
  89                              attribute = ldap_next_attribute( ld, e, ber ) )
  90                         {
  91                                 if( strcasecmp(
  92                                         attribute, SYLDAP_V3_TEST_ATTR ) == 0 )
  93                                 {
  94                                         vals = ldap_get_values_len( ld, e, attribute );
  95                                         if( vals != NULL ) {
  96                                                 for( i = 0; vals[i] != NULL; i++ ) {
  97                                                         baseDN = g_list_append(
  98                                                                 baseDN, g_strndup( vals[i]->bv_val, vals[i]->bv_len ) );
  99                                                 }
 100                                         }
 101                                         ldap_value_free_len( vals );
 102                                 }
 103                                 ldap_memfree( attribute );
 104                         }
 105                         if( ber != NULL ) {
 106                                 ber_free( ber, 0 );
 107                         }
 108                         ber = NULL;
 109                 }
 110         } else
 111                 debug_print("LDAP: Error %d (%s)\n", rc, ldaputil_get_error(ld));
 112
 113         if (errcode)
 114                 *errcode = rc;
 115         if (result)
 116                 ldap_msgfree( result );
 117         return baseDN;
 118 }
 119
 120 /**
 121  * Attempt to discover the base DN for a server using LDAP version 2.
 122  * \param  ld  LDAP handle for a connected server.
 123  * \param  tov Timeout value (seconds), or 0 for none, default 30 secs.
 124  * \return List of Base DN's, or NULL if could not read. List should be
 125  *         g_free() when done.
 126  */
 127 static GList *ldaputil_test_v2( LDAP *ld, gint tov ) {
 128         GList *baseDN = NULL;
 129         gint rc, i;
 130         LDAPMessage *result = NULL, *e;
 131         gchar *attribs[1];
 132         BerElement *ber;
 133         gchar *attribute;
 134         struct berval **vals;
 135         struct timeval timeout;
 136
 137         /* Set timeout */
 138         timeout.tv_usec = 0L;
 139         if( tov > 0 ) {
 140                 timeout.tv_sec = tov;
 141         }
 142         else {
 143                 timeout.tv_sec = 30L;
 144         }
 145
 146         attribs[0] = NULL;
 147         rc = ldap_search_ext_s(
 148                 ld, SYLDAP_SEARCHBASE_V2, LDAP_SCOPE_BASE, SYLDAP_TEST_FILTER,
 149                 attribs, 0, NULL, NULL, &timeout, 0, &result );
 150
 151         if( rc == LDAP_SUCCESS ) {
 152                 /* Process entries */
 153                 for( e = ldap_first_entry( ld, result );
 154                      e != NULL;
 155                      e = ldap_next_entry( ld, e ) )
 156                 {
 157                         /* Process attributes */
 158                         for( attribute = ldap_first_attribute( ld, e, &ber );
 159                              attribute != NULL;
 160                              attribute = ldap_next_attribute( ld, e, ber ) )
 161                         {
 162                                 if( strcasecmp(
 163                                         attribute,
 164                                         SYLDAP_V2_TEST_ATTR ) == 0 ) {
 165                                         vals = ldap_get_values_len( ld, e, attribute );
 166                                         if( vals != NULL ) {
 167                                                 for( i = 0; vals[i] != NULL; i++ ) {
 168                                                         char *ch, *tmp;
 169                                                         /*
 170                                                          * Strip the 'ldb:' from the
 171                                                          * front of the value.
 172                                                          */
 173                                                         tmp = g_strndup( vals[i]->bv_val, vals[i]->bv_len);
 174                                                         ch = ( char * ) strchr( tmp, ':' );
 175                                                         if( ch ) {
 176                                                                 gchar *bn = g_strdup( ++ch );
 177                                                                 g_strchomp( bn );
 178                                                                 g_strchug( bn );
 179                                                                 baseDN = g_list_append(
 180                                                                         baseDN, g_strdup( bn ) );
 181                                                                 g_free( bn );
 182                                                         }
 183                                                         g_free(tmp);
 184                                                 }
 185                                         }
 186                                         ldap_value_free_len( vals );
 187                                 }
 188                                 ldap_memfree( attribute );
 189                         }
 190                         if( ber != NULL ) {
 191                                 ber_free( ber, 0 );
 192                         }
 193                         ber = NULL;
 194                 }
 195         }
 196         if (result)
 197                 ldap_msgfree( result );
 198         return baseDN;
 199 }
 200
 201 int claws_ldap_simple_bind_s( LDAP *ld, LDAP_CONST char *dn, LDAP_CONST char *passwd )
 202 {
 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         debug_print("binding: DN->%s\n", dn?dn:"null");
 214 #ifdef G_OS_UNIX
 215         return ldap_sasl_bind_s( ld, dn, LDAP_SASL_SIMPLE, &cred,
 216                 NULL, NULL, NULL );
 217 #else
 218         return ldap_simple_bind_s(ld, dn, passwd);
 219 #endif
 220 }
 221
 222 /**
 223  * Attempt to discover the base DN for the server.
 224  * \param  host   Host name.
 225  * \param  port   Port number.
 226  * \param  bindDN Bind DN (optional).
 227  * \param  bindPW Bind PW (optional).
 228  * \param  tov    Timeout value (seconds), or 0 for none, default 30 secs.
 229  * \return List of Base DN's, or NULL if could not read. This list should be
 230  *         g_free() when done.
 231  */
 232 GList *ldaputil_read_basedn(
 233                 const gchar *host, const gint port, const gchar *bindDN,
 234                 const gchar *bindPW, const gint tov, int ssl, int tls )
 235 {
 236         GList *baseDN = NULL;
 237         LDAP *ld = NULL;
 238         LdapControl *ctl = ldapctl_create();
 239         gint rc;
 240
 241         if( host == NULL )
 242                 return NULL;
 243         if( port < 1 )
 244                 return NULL;
 245
 246         ldapctl_set_tls(ctl, tls);
 247         ldapctl_set_ssl(ctl, ssl);
 248         ldapctl_set_port(ctl, port);
 249         ldapctl_set_host(ctl, host);
 250         ldapctl_set_timeout(ctl, tov);
 251         ldapctl_set_bind_dn(ctl, bindDN);
 252         ldapctl_set_bind_password(ctl, bindPW, FALSE, FALSE);
 253
 254         ld = ldapsvr_connect(ctl);
 255         if (ld == NULL) {
 256                 ldapctl_free(ctl);
 257                 return NULL;
 258         }
 259         baseDN = ldaputil_test_v3( ld, tov, &rc );
 260         if (baseDN)
 261                 debug_print("Using LDAP v3\n");
 262
 263 #ifdef G_OS_UNIX
 264         if( baseDN == NULL && !LDAP_API_ERROR(rc) ) {
 265 #else
 266         if( baseDN == NULL) {
 267 #endif
 268                 baseDN = ldaputil_test_v2( ld, tov );
 269                 if (baseDN)
 270                         debug_print("Using LDAP v2\n");
 271         }
 272         if (ld)
 273                 ldapsvr_disconnect(ld);
 274
 275         ldapctl_free(ctl);
 276
 277         return baseDN;
 278 }
 279
 280 /**
 281  * Attempt to connect to the server.
 282  * Enter:
 283  * \param  host Host name.
 284  * \param  port Port number.
 285  * \return <i>TRUE</i> if connected successfully.
 286  */
 287 gboolean ldaputil_test_connect( const gchar *host, const gint port, int ssl, int tls, int secs ) {
 288         gboolean retVal = FALSE;
 289         LdapControl *ctl = ldapctl_create();
 290         LDAP *ld;
 291
 292         ldapctl_set_tls(ctl, tls);
 293         ldapctl_set_ssl(ctl, ssl);
 294         ldapctl_set_port(ctl, port);
 295         ldapctl_set_host(ctl, host);
 296         ldapctl_set_timeout(ctl, secs);
 297
 298         ld = ldapsvr_connect(ctl);
 299         if( ld != NULL ) {
 300                 ldapsvr_disconnect(ld);
 301                 debug_print("ld != NULL\n");
 302                 retVal = TRUE;
 303         }
 304         ldapctl_free(ctl);
 305
 306         return retVal;
 307 }
 308
 309 /**
 310  * Test whether LDAP libraries installed.
 311  * Return: TRUE if library available.
 312  */
 313 gboolean ldaputil_test_ldap_lib( void ) {
 314         return TRUE;
 315 }
 316
 317 const gchar *ldaputil_get_error(LDAP *ld)
 318 {
 319         gchar *ld_error = NULL;
 320         static gchar error[512];
 321
 322         ldap_get_option( ld, LDAP_OPT_ERROR_STRING, &ld_error);
 323         if (ld_error != NULL)
 324                 strncpy2(error, ld_error, sizeof(error));
 325         else
 326                 strncpy2(error, _("Unknown error"), sizeof(error));
 327         ldap_memfree(ld_error);
 328
 329         return error;
 330 }
 331 #endif  /* USE_LDAP */
 332
 333 /*
 334  * End of Source.
 335 */